Problem - Check Engine Light! What Happened? 2021 GMC Sierra AT4

[@Donslife]

Code P0307 - Cylinder 7 Misfire Code P050D - Cold Start Rough Idle BlueDriver Bluetooth Pro OBDII Scan Tool for iPhone & Android by Lemur Vehicle Monitors : amzn.to/3mtC8Vz linktr.ee/donslife - Links to all of my products and discounts

[@cg5482]

Totally agree with what you said about brands and issues. My family has had f150, explorer sport trac, Toyota RAV4, Nissan Titan, bmw 5 series, Range Rover, Dodge Ram, Ford Expedition, and every single one of them has had an issue or another. That is why we now just choose the style and creature comforts and drive that we like and hope for the best. If you chase reviews you will find problems with every brand, even Tesla that doesn’t even have near as many moving parts as other vehicles. Keep up the great content! Enjoying the ride along with you and your videos.

[@Donslife]

Thank you 🙏🏻 Part of the automobile ownership experience

[@user-tb7rn1il3q]

You and your family must be unlucky. Cars nowadays (regardless of brand) rarely have major problems. You are more likely to get struck by lightning.

[@johnf.9975]

I gotta say i absolutely love the AT4s. I had every intention of buying one even after hearing and having issues myself with a 2019 Silverado 5.3. I just bought (today) 2022 Silverado RST with the 3.0 L duramax. I really like the power from this engine. Hopefully reliability will be better. Congrats Don on your channel. I still will use some of your mods as inspiration for my new truck.

[@Donslife]

Thanks man! Love it!

[@fredmctavish4108]

Love the duramax! I pick my duramax at4 up this week

[@ddw3968]

@@fredmctavish4108 thinking about ordering a refreshed 2022 Denali with the 3.0

[@budlite8207]

Love my Duramax 3.0. 13k miles on it since last March. 0 issues. Fuel mileage is outstanding.

[@johnf.9975]

Zero regrets so far with mine. Mileage is awesome

[@dindocruz4616]

Been watching ur channel since iam new to the truck world, just got my 21 sierra elevation last july, iam from manitoba. Learned a lot from you thank you

[@Donslife]

Awesome 👏 glad to help

[@justinralston2879]

Just want to share with you my experience with the very same situation. I have the same intake and a flow master American thunder exhaust. Also I was running a DFM delete by Range while this all happened. Back in July my 2021 SLT threw the same code while on a drive but all seemed fine. After running into a store I came back out started the truck and started taking off from the parking lot and the truck started making machine gun noises from the engine (amplified from the intake) and realized immediately that the engine was misfiring. Limped the truck home and parked it. Now the weird thing is I took the truck down to the dealership and it stopped doing it and they couldn’t replicate the issue so they cleared the same code you received and sent me on my way. As I cautiously drove the truck around town I started to hear tapping or knock coming from the engine bay and I knew that was not good. I took the truck right back to the dealership and this time the Service Manager stepped in and said he recognized this and said it sounds like a lifter issue. After they looked into it it was a collapsed lifter in cylinder 7, so they had to replace all lifters on the left side. I went home and did some of my own research on this and found service bulletin PIP5776F which requires GM to replace all lifters (for specific models and dates). So I brought this up to the dealership and they were hesitant at first to do this but eventually did because they spoke GM and had no choice, so long story short I now have all new lifters in my engine. You may not have the same experience but so far you are checking the box on everything I experienced. Sorry this is happening to you and wish you the best, especially with all the parts shortages due to COVID.

[@cameronmiller168]

How do you like the FM American thunder exhaust? I’ve been eyeing this and it’s tough to pull the trigger on any specific exhaust.

[@JebClarke902]

That's scary & surprising that you had a lifter failure with DFM disabled. The whole reason I bought my Pulsar LT was to prevent that from happening in the first place. Good luck and I hope it's smooth sailing for you from here on out.

[@fredmctavish4108]

Is that only with a gasser?

[@JebClarke902]

@@fredmctavish4108 Yes. The diesels don't have cylinder deactivation.

[@1duramaxhd]

@@JebClarke902 disabling dfm has nothing to do with the lifter failure. Still happens all the time with range used. It was a bad batch in 21.

[@brodysreview770]

Got a 2021 5.3 at home with 29 thousand km also near Saskatoon so the same weather, seems to be running good never had any problems oil changes every 7k heard a lot of lifter problems leading to a lot more problems. Hopefully it’s just the cold weather for you!

[@Donslife]

Hope so brother. I am more worried about the hassle if it is a major issue

[@liorosales1308]

Back in August I started looking for trucks and was leaning to ram till I ran into your channel. I kept seeing them and in December I got myself an at4 6.2 white. So I've been going back to see all your mods to see what I'll do to mine. Thank you for making my mind up on my new truck and I hope 🙏 everything goes well with yours.

[@Donslife]

Thank you! I will keep on truckin'

[@joshwoyame1554]

Just wanted to share my experience. I have a 2019 Sierra 1500 SLT with a 6.2 engine. I am in sales and drive a lot but 90% is all highway miles. I've had many problems with this truck but in January 2022 my engine failed. Broken lifter and bent push rod which also damaged my cam. It is 2.5yrs old but due to my job requiring me to drive a lot it had 110,000 miles on it. Truck still looks new and I take care of it well. I was left with a decision to either fix the existing engine for $6,500 or replace the engine for $8,000. GM refused to cover anything and after the new engine was put in the bill from the dealer was $9,365. I also had $1,400 in rental car fees during the 6 weeks it took to get my truck back. Also, I opened my hood after getting the truck back and the wire harnesses were just laying in there not put back in the factory clips, the bolts for the airbox were missing and several other brackets and bolts were either missing or just hanging there. Just wanted to share my story because this was the first, and last, GM product I will ever own. It should be a crime to have someone replace an engine in their $65,000 truck when it's 2yrs old especially when it's a known issue for them. Very stressful and depressing situation to go through. Anyways, love your channel, you do a great job!

[@joshwoyame1554]

Also wanted to add that the truck had absolutely no mods on it when this happened. As soon as I got the truck back I put a Pulsar on it to eliminate the DFM but that's it.

[@Donslife]

Wow, sorry you had to go through all of that. My channel will continue to have some variety and not just my AT4.

[@johnvella7376]

‘21 sierra AT4 Just had similar issues. Lifter problem that caused a few other issues. GMC fixed issue very quickly took great care of me.

[@Donslife]

Thanks John, it is refreshing to hear you were met with a good experience getting service. Unfortunately the majority of people only take the time to highlight poor experiences. I don’t have data, but I am inclined to think way more people get looked after in a fair and consistent manner. Not all of course, but most.

[@michaelploesser8975]

2020 6.2 Boss with a build date of Sept 2020. Lifter failed at 5k miles and both banks replaced. Rotofab intake with Borla S type and quads on mine with JLT catch can that was installed prior to lifter failure. I too had those intermittent warnings before failure. I’m sure you know from Sept 2020 to March 21 was a bad batch of lifters. Been 3K since repair and no further issue. I too need remote start to function as I’m just below you in North Dakota. Went through the same frigid temps this past week. Keep up the good work on the channel. I’ve been following along.

[@Donslife]

Thank you neighbor!

[@gewing61]

Thanks for sharing. Love the mods. Have the At4 2020 with induction and cat back exhaust on 6.2. Love the vehicle. I think you are correct on your diagnosis. I had a miss fire on my previous 6.2 turned out plug wire wasn’t pushed right on and it worked itself loose. Easy fix. Hope everything works out ok

[@steelvanveen3950]

Hate to say it, but it’s likely lifters. I had a Jan build 21 5.3 as well from Saskatoon. First batch went at 18,000kms and the dealer only fixed one side. 3,000kms later the second side went. Same codes as you read. My biggest advice (if it is the lifters) is to DEMAND they do both sides. First set left me and my family stranded 6 hours from home. Second set, thankfully, we were close to home. I went through a 3 month process w GM Canada. It wasn’t pretty. Be firm w your dealer on what and how they fix it and keep record of all phone calls and paper work. There’s currently a class action law suit going on vs GM and this issue. Best of luck!

[@Donslife]

Thanks Steel. The dealership has been pretty good to us over the years. If it comes to pushing them to be thorough, I hope they accommodate.

[@2lopezd]

This issue with vehicles nowadays is everything is so massed produced that you’re bound to have issues with any manufacturer. every manufacturer has came a long way but because it’s all about numbers there all bound to have issues sooner or later. I currently own an 2021 GMC Sierra 2500 with the Duramax I’ve had for 4 months and just rolled over 8100 miles trucks been phenomenal no complaints whatsoever

[@Donslife]

I was so close to getting a 2500 but I felt I wouldn’t get the HD use out of it. Glad you are having a great experience with it!

[@2lopezd]

@@Donslife I owned a 21 Silverado 1500 Custom crew cab with the 6.5 bed for 8 months before I got the 2500 and I think it was a bit of an overkill. Honestly just got it just because but since I’ve owned it I’m glad I got the additional payload capacity. I’ve had 2,000lbs in the bed and it was like nothing. I’ve gotten the use out of it a lot more then I anticipated and my wife and I are hoping to get a camper this year.

[@2lopezd]

@@Donslife oh and the best part has been the fuel economy. Yeah the duramax is a $9800 option in the US but I get 22 miles on the highway 18-19 mixed and about 15-16 in the city. Compared to the 1500 which granted it had the 5.3L with the 6 speed I was luck to get 17 on the Highway I was getting 15 combined and 13-14 in the city.

[@jamiehaney5233]

Mine did same thing at 1500 miles, 2021 AT4. Dealer replaced the computer box and hasn't done it since.

[@OneBadSon]

10K subs, congrats!! Keep up the quality content!

[@cbofresh861]

I had same error codes of p050d and cylinder misfires and had to replace fuel injectors. 13 states mandate replacing fuel injectors for error codes such as p050d that covers 150k or 10 years for the 2016 models (maybe newer too?) I have a 2016 GMC Sierra with 33500 miles and took it into the GMC dealership in Concord, CA because of vibration, shaking, loss of power, on what felt like a rough idle start. At that time, I had about 3 weeks of warranty left so I wanted to document it and get it fixed. But no code was showing at the time, so no fix. Dealership tells me they feel the shake and vibrations but considered it normal. As the warranty expired, the p050d code popped up and I contact the GMC in Concord, CA and was told I was SOL, warranty expired. I then took it to a local mechanic shop who told me I had misfires in two cylinders. Again, Concord GMC refused to take care of it. I suspected it was the fuel injectors. After months of driving it with check engine light coming on intermently, I decided to take it to GMC in Dublin, CA who repaired the fuel injectors (one side only) under warranty. I learned that 13 states (Ca, Or, Wa, NY to name a few) mandated them to replace fuel injectors for such codes bc of emissions regulation. The warranty for fuel injectors or 150k or 10 years.

[@Donslife]

Some good info here 👍🏼 thank you

[@Hutt92]

Had the same problem with my 22 trailboss 5.3L a month ago ended up being a blown fuel injector conveniently they are on back order and not expected to come in any time soon. Started the same way I live in fort Mac alberta truck left me stranded on the side of the road on the coldest day of the year.

[@Donslife]

Brutal. That’s like the worst case scenario

[@kc1072]

Silverado with a 5.3. I’ve had a flashing check engine light every once and a while with no miss fires or power loss. I’ve taken it to the dealer multiple times and there are no codes. I have the same mods as you, and the check engine light was there even before the mods. They tell me there’s nothing they can do till it breaks. I’m at 18k miles and just hoping for the best since nothing has happened.

[@kc1072]

My truck doesn’t have cylinder deactivation and I get an oil change every 4K miles. Idk man.

[@JB-TM-2023]

Hey so i had the exact same thing happen with my 2020 seirra. It came back as bad fuel injectors. Too much fuel on a cold start.

[@Donslife]

Thank you for sharing!

[@Leo-ed4hv]

I owned a dealership and cold weather misfires are common on all makes and models sooner or later. Clearing the code should take care of the problem. If it happens often, then it's time to dig deeper.

[@Donslife]

Thanks for sharing. I haven’t had anymore problems since clearing the codes. Fingers crossed 🤞

[@naquoashuey2794]

@@Donslife you will. It’s an injector failure.

[@freddyp4189]

Congrats on the 10k the content you put out is worthy of more! Keep us updated on what the dealership says!

[@Donslife]

Thanks! And I will

[@SLiCKFARTS]

Bro I hired an attorney and filed a complaint with GM. I have a 2020 GMC Sierra AT4 black widow. Exact same thing except I live in Arizona. Started doing this at 5k miles. Happening over 10 times now. Dealership has no clue what’s wrong. They replaced my water pump last time, lol didn’t work. It’s also happened and I can’t get the dash lights to turn off as well and this drained my battery. If you would like info on what’s happens with my complaint with GM give me a e-mail I can keep you updated at, this goes for anyone else dealing with this crap. I also have a slightly rough running motor now. Currently odometer is 41k miles. Spent a total of 67 days at the dealership so far. Good luck bro.

[@Donslife]

Water pump? Didn’t think I would see that listed. I guess you have extreme heat there and we have extreme cold. I may take you up on the email down the road. My email is in my video descriptions too. Good luck man

[@SLiCKFARTS]

@@Donslife They tried the water pump because of the chatter coming from the motor, didn’t work. Made a awesome new issue, when the motor is cold it makes a high pitched belt sound for 15 seconds or so. Awesome. I love my truck but when I’m not sure if it will leave me stranded somewhere it becomes a problem. I can take cosmetic stuff failing but motor reliability is where I draw the line.

[@Donslife]

@@SLiCKFARTS I understand the sentiment

[@sambiscits6711]

I have a 2022 GMC Sierra AT4 my check engine light is on, and I'm 99% sure why I bought a Coca-Cola Classic Coke Bottle 4L Mini Fridge w/ 12V DC and 110V AC Cords I'm guessing I could clear the code by hooking up and OBD?

[@rubenmanitowabi]

You’re one of the lucky ones have the exact same rig colour and everything just got my rig out of the shop it was throwing all those codes yaa da yaa da yaa da motor grenaded 12000 bux later back on the road

[@mschoey76]

Was there ever a solution found for this issue? I have a 21 AT4 with 3.0 duramax with no modifications same components as it rolled off the show room floor with and when temperatures are below 30 degrees Fahrenheit the truck will rough idle and shut off throwing the same pop up errors about parking brake, brake, emissions and limiting speed and travel. Gmc dealer has supposedly fixed this 3 times and it just did again 10 days after gmc supposedly fixed it

[@Donslife]

For me it seemed to stop after adding a fuel treatment and going through some more tanks of gas. However just recently (Jan 2023), I had another misfire on cylinder 7. Code is clear and is running fine.

[@redfoot69]

My 2020 GMC Sierra 1500 I4 engine just for 3rd time engine light on each past 2 times around 35000 miles each the egr valve for emissions failed I have 350 miles left on warranty at 99650 miles on truck sitting outside GMC right now waiting for them to open fix any warranty issue

[@redfoot69]

Seems to be emissions code again

[@Joeymach01]

Hey Don thanks for sharing I had a 2015 GMC Sierra 6.2l with 50k and already had my 3 lifters changed in driver side when only had 21k in the winter of 2017. Now a month ago I did the same thing you did I start my truck with my remote and notice the rough idle I drove and had no power check engine light came on and it took it to the dealership misfire on cylinder 4,8 after they recommended me to do a full tuneup but that wasn’t the problem 1 week later came back again for the same problems and this time was the lifters. 🤬

[@Donslife]

Bummer man. Thanks for sharing

[@freddyp4189]

Had a buddy with a I think 2014 Yukon 6.0 had recurring issues with lifters as well.

[@peterkaputsos4125]

I have a 22 w/ 5.3 reserved. This lifter issue has me concerned and thinking about canceling. Does anyone know if this is being rectified for the 22 model with the replacement lifter?

[@nocturnalme3549]

@@peterkaputsos4125 brother if you still can cancel it, run. Gm is finished. Their products have sunk to an all time low. I have the new Sierra elevation a d have nothing but issues. My check engine light is on now too, most likely failing injectors. The truck always has the Chevy shake rumble going thru the gears. Rattles so much it's shaking the panels apart literally. Terrible ride, never had a vehicle ride like this. Some days it feels like a clapped out civic. Only way to go is older tundra or hd models. Most American truck makers have sold out

[@hamm3790]

Ok. I’m starting to feel better. I had a very similar issue just happen to my 2018 Silverado. Hoping it was just the cold. Scared me to death!!! But it happened when I was going from 45mph to 55. Started shaking like a flat tire then suddenly engine light came on. Code showed coil 6 mis firing. Replaced #6. Happened again. Said same thing. So we swapped 6 & 4 and replaced the spark plug and wire. Happened again. Took it to the dealership and they couldn’t find anything wrong. But now every time I drive it I worry it will happen again and cause serious damage. But all 3 times, it has been super cold and I let it warm up for about 10 minutes. I no longer let it warm up. So far, no more issues 🤞

[@evanpowell995]

Have you had the Service 4WD warning pop up? Just did on my ‘21 AT4 and from what I have found, it’s common with no real problem, fix, or understanding why it happens. The two most common things I found were people cleaning the ground wire underneath the vehicle on the drivers side or the warning just stops one day without any correction.

[@davecottrell3044]

Have you any experience with cold weather problems with the new 3.0L Duramax?

[@Donslife]

Haven’t heard of problems with some of the people I know. Just plug it in when it is cold enough to warrant it

[@MrSnyder21]

Just had this same problem with my 2021 AT4 w 3L Duramax. Even started with low tire pressure , however it’s 0F with a wind chill of -20F. It was running fine, got gas, stopped at a store and then rough start when I got back in with the same warning messages. After letting it sit after a second attempt it started and drove fine, except the service engine light is on still. Since it’s XMas eve, no dealerships are open. Any help or insight is appreciated

[@davecottrell3044]

@@MrSnyder21 just keep driving it if you can. After a few starts, the check engine light will likely go out. I’m getting the DEF system removed as soon as I can. No one up here where it gets done below -40 keeps it. They either get the DEF system removed or trade it in for a gas-powered pickup.

[@logicalguy488]

It would be interesting to see if some of your issues don't go away if you put the original cold air intake back on. The original intake and the position of the mass air flow sensor is vital to give correct data to the computer. I have seen so many trucks have issues with aftermarket intakes that some guy without an engineering degree it turning out in his basement or small shop.

[@Donslife]

You may be interested to hear my update soon. 🖖

[@6ix369]

2021 there is a recall 6.2 and 5.3 for the lifters so might want to check that out

[@johnnyflowers1001]

When was it issued?

[@templar2b1ask]

Keep me posted as I bought in April a new 2021 High Country Silverado 1500 with 6.2L & 10 speed. I too am hearing from Facebook about these same issues. Makes me nervous about going on a long trip. I live in SW Michigan. Using mid-grade Shell gas & using higher octane Shell when pulling anything heavy, which isn’t often. Being retired my truck is parked inside where it doesn’t get very cold under a by-level home, unheated garage. Trusting GM to do a complete recall soon. I’ve been thinking of removing all this high tech engine controls & going back for the full time V-8 version. Feeling safe while under a GM warranty, but that is only short lived. I’d rather be pro-active than be stuck with a bad engine. I am NEW subscriber here today! I’ve got 12,000 miles on my Chevy.

[@Donslife]

Welcome to the channel!

[@randolphwashington7265]

I had a similar issue. When I had a 2019 Silverado RST They stated it was the fuel injectors and changed them.

[@Donslife]

Thanks Man. I appreciate the insight

[@leefehlman6613]

I thought I seen you use the settings in the infotainment center to retrieve the diags codes to research the set codes? Is there a vid on how to do this? Your vid's are pretty cool! 2021 AT4 6.2 Just starting the mod process for a few things really liked the video on the mirror spots and high beams. Worried what would that do to the warranty and extended warranty?

[@Donslife]

The lighting mods should be okay. They are just telling the lights to turn on with another signal/trigger. As for the diagnostics, I was using an android box that I reviewed in November that adds more infotainment features including installing android apps

[@johnnyflowers1001]

Based on the experience your having it may be an issue with the lifters. GM is currently being served a lawsuit or having faulty valve lifters on 5.3, 6.0, and 6.2 engines. I would get the truck into the dealership asap. Make sure they replace all of the lifters passenger and driver side.

[@michagenberger]

I have a 2021 GMC Sierra at4 as well with the 5.3l engine and I had the same issue. All of the same lights and warnings popped up and I had to get all of the lifters replaced. Was not a fun experience.

[@johnnyflowers1001]

@@michagenberger I have an AT4 2021 as well so far I haven’t had any issues I’m barley at 2K tho.

[@jayk.2276]

@@johnnyflowers1001 when did you buy yours or was it manufactured? I was told that in March of 2021 they changed the lifters, and later on deleted DFM. I recently purchased mine 11/29/21 and my does not have DFM and apparently has different lifters.. So I'm curious if this still happening to models w/o DFM and supposed revised lifters.

[@johnnyflowers1001]

@@jayk.2276 mine was out of production on August as per the vin info

[@michaelgray4585]

2021 AT4 with 5.3L 14k miles currently getting all lifters replaced. Not happy at all but hopefully this fixes the issue

[@michaeloski3480]

Since you put a aftermarket air filter i suggest get the mass airflow spray clean the mass sensor unplug the battery first it cost the least to try that it worked on my 2020 Tahoe RST 6.2

[@Donslife]

Thanks! I might do that

[@BrianChristopherFranco]

My 2 neighbors have 2021 GMC Sierras and both have been in for lifters, one just once and the other has had it done 4 times. We're in South Texas so cold is definitely not the issue! The more frequent gmc is going back next week for them to check it out yet again! Hope your issue worked itself out! And if so, what was it that fixed it?

[@3gchapa]

I'm from south texas too. Weslaco area to he exact. Was wondering if you heard any additional information from your neighbors that might help with this issue? Do you know if the dealership helped them out or gave them a hard time?

[@BrianChristopherFranco]

@@3gchapa were down in corpus but away from the ocean,far nw side at the city limit edge! The one neighbor that had it once hasn't mentioned any updates and he's not a favorite of our neighborhood! However my other neighbors haven't had issues since this last post until recently! About 3 weeks ago, the engine is showing similar issues before the check engine light popped on last time! It studders and shakes at idle, sluggish take off, almost feels like the transmission is slipping at speeds from 0-35ish mph! No check engine light just yet but we have a feeling it's coming! As this would be more than 3 times, they are thinking about lemon law but they placed a big down payment! Usually buy backs only cover the truck for what it's worth now and not brand new from how it was explained to me! Still runs though! Are you experiencing anything similar? And yes it does it with the engine auto stop enabled or disabled! Best of luck to you!

[@Carbon15556]

For all of you GMC pickup 2019 and up..I have a GMC 2020 5.3 Denali and use Metal Lube search about it…. Mixed with synthetic oil with that and runs smooth

[@Donslife]

Doesn't seem like it is available in Canada

[@MrSmokin04]

Good to know about issues I can look forward to. 2022 AT4 here. I'm ready to ditch all of the "new tech" already and it hasn't been 2K miles for me. I'm already considering an LS swap.

[@Donslife]

I am hearing the 22’s are fine and unlikely to have a lifter problem present itself. Just what I read.

[@MrSmokin04]

@@Donslife I REALLY hope that's true. But so far, even the dealer I bought the truck from can't confirm that DFM was removed/not installed from mine. And I still feel the wonkiness (stumbles/misfires) when driving, even in L9. Most notably at 45 mph. Obvious issue with no CELs or anything that I could take it to the dealership for. I've considered ripping the heads off and finding out what's ACTUALLY installed on my engine since even GM doesn't seem to know. WTF is wrong with them?

[@wls200]

That series of failure notifications on the dash are exactly what my 21 5.3 did when the lifters failed. Restricted speed, idled horrible. Dealer only replaced the bank of lifters on the failed side.

[@jessecarrier681]

I drive a 2021 GMC Sierra AT4 as well and mine is throwing a check engine light at me. It’s saying it’s the emissions system. -40/-50 sure takes a toll on vehicles.

[@Donslife]

I am inclined to agree. -52°C today (-58°F)

[@yanickguilbeault2771]

There's a class action lawsuit in the USA for the lifter issues. Is there one here, in Canada? Could a lawsuit in the USA trigger a recall in Canada?

[@Donslife]

I am not sure. I guess the verdict will need to come first and see if it influences Canada

[@MtnManMT]

My 2021 Silverado 6.2L is at the dealer right now. Just broke 10k on the odometer and going down the highway it started knocking. Bad. I was 73 miles from my dealer in the Montana country. No check engine light. I've got a loaner vehicle right now.

[@ededic2008]

I have a 2021 Silverado Trail Boss with a 5.3L engine. I purchased the truck 12/2020 and within the first 3 months (4,000 miles) I had this happen twice. First time the dealer said it could have been a computer glitch. After it happened the second time, the dealer tested the response/recovery rate of my injectors and it was found that two of my injectors had a slower response time compared to the other 6. The dealer replaced two injectors and now the truck has 15,000 miles and has not had any more issues.

[@Donslife]

Thanks for sharing. This info could come in useful

[@peiguy1982]

Maybe a winter fuel issue with the additives. Try running mid grade or premium in winter since they add those winter additives, takes away from the octane rating too much with the 87. I doubt it will come back after the reset.

[@Donslife]

I have always ran 91 (highest I can get here). Good advice though

[@peiguy1982]

@@Donslife Still maybe fuel contamination at that station. Apparently during fuel deliveries the truck mixes it all up, bad time to do a fill up. We have shitty fuel here on PEI.

[@andresexton4295]

Another great video! Wonder if moisture in fuel froze some causing temporary miss on number 7. We see it here in Nova Scotia. Next week we are having a few nights -20c . Cold for us lol! Fingers crossed you have no more issues! I have 1200 km on my 22 ltd hoping I have good engine. I’ve had 4 5.3 l equipped trucks and now a 6.2 . No issues. Truck was built middle September.We will see!

[@Donslife]

Thanks Andre!

[@adanr150]

Mine did that today. It’s hot where I live now engine light on still. How do you check codes through screen in truck

[@MW-fr7bx]

I had this happen with 2 separate 2017 Suburbans. They were idling and it sounded like they were going to blow up. One was the weekend I brought it home from the dealer and I immediately brought it back. The 2nd one happened a little over a year later. Turns out it was just a chip malfunction and it was fixed in a few hours. Haven’t had the issue since.

[@Donslife]

So much more complex. As we all know too well - Gone are the days of just replacing a fuel filter lol

[@zeferinovillanueva3802]

I have the same problem with mine mine was diagnosed with a bad battery module sensor

[@Crushin123]

Glad I found your channel - was considering selling my 2019 Super Duty Diesel for a GMC ....finding many issues GM is having. None of the manufacturers are perfect - but my flaking sidestep paint now seems silly to be pissy about. lol. I must mention its my 4th F250 diesel and I have had a 2016 Sierra that had some concerning issues - i traded it in. Diesel fuel prices are ridiculous east of Toronto - so was going to downsize to a gas engine. Might hold off now. Great content Cheers

[@Donslife]

Thanks for watching! I hear what you’re saying, and yes I acknowledge there are many reported issues with what I have discussed in the video. However, there are far more people doing just fine with these trucks too. 🤷🏻‍♂️

[@MEXICAN_memes]

Crazy I found this video my truck is only 11 months old same codes wow ..,

[@markphilip581]

Is it possible just having the intake and exhaust installed. Computer has issues in extreme cold with the different parts.

[@Dineskii]

Same exact thing happened to me except my code was for open 5v reference circuit. Ran tests and nothing was showing as opened. Kept driving w just check engine light and it eventually went away…1 1/2 months later it all came back lol

[@hdjoe22]

My 19 Denali occasionally throws those service esc, parking brake, service 4wd, and will also throw a check engine. When I scan it , the scanner shows miscommunication with trans. The check engine light goes away after a day or so, and the service ___ lights all shut off after it sits for a while. I unplug my negative for about 15 seconds as a reboot here and there and it keeps the truck in top top shape. Seems like we have so much crap going on with these trucks that it acts like a pc with not enough Ram. Mine happens mostly in overly humid weather

[@jamesporter9530]

Keep the Good information coming, I bought a new GMC sierra denali I had several check engine lights on when I purchased this truck. I became worried and had taken my truck into the dealership with 250 miles the misfire code came up but after two occurances I haven't had a issue since. I love my truck and watch your channel to install your easy do it yourself upgrades.

[@Donslife]

Thanks for sharing and I am happy to keep the projects coming!

[@pigmenttoostattoo9896]

Como se soluciono el problema amigo? Porque tenia esas luces de tablero prendidas?

[@stevebecwar9286]

If it starts to pop like a back fire it's a lifter failure, my 5.3 AT-4 dropped a lifter at 8400 miles, no check engine light. Second failure at 11,400 dash lights lit up like a Christmas tree and same messages on my screen as you had.

[@Donslife]

Hoping for less drama 🤞

[@barrygrimmett6394]

How were you able to see and clear the codes on the head unit?

[@Donslife]

I was using an Carplay/Android box that lets you install apps. I did a review for this one.

[@A249209]

Hey Don, great video. I noticed that you pulled up Blue Driver info directly from the Sierra screen. Can you tell me how you added this feature?

[@Donslife]

Thanks. I added a Carplay Android box. Here is the video, keep in mind this is a year old too MAJOR UPGRADE for Your Existing Wired Car Play or Android Auto! KZbin and Netflix! kzbin.info/www/bejne/kIqycn-EqLOtpqs

[@harrya3324]

Hi Don, I talked to you before. I had the exact truck you have, unfortunately @ 40k mile the lifters collapsed on the left side. They would only replace the bad ones. I thought about it a bit and decided to trade it in before it happens and I'm out of warranty. The new one is a 2024 6.2 ZR2. I bought the extended warranty this time, hope it doesn't happen again. Do you know if the corrected the problem with those engines or not?

[@harrya3324]

Do you know if the L9 works on the newer trucks to keep it in V8 all the time?

[@darylstewart9965]

My 2021 At4 also has a build date of Jan 15TH ,only 800 miles and keep in storage for winter months' live in NNY and its -4 F here today's hope your truck checks out ok but im very leery about long distance travel esp. because i plan to tow a travel trailer in summer months and would certainly hate to have a lifter breakdown, guess i need to break it out of storage and get some miles on it and hopefully lifters give out before the 8,000 mark to get both banks of lifters replaced locally, sucks because i almost want to sell it on Vroom and order 2022,good luck and i love your channel:)

[@Donslife]

I towed my trailer and boat. Both on the medium to heavy side of the vehicles capability and it was strong. The 10 speed trans made it so much better compared to the 6 speed on my previous Denali 6.2

[@darylstewart9965]

@@Donslife Good to Know,Keep us posted please on the outcome of your issue,thx

[@tpaulmac]

Hi Don. Maybe injectors? I had that happen last year. 2017 Sierra Denali 6.2L, 8spd, with aftermarket tune, and 315x50x20 Ridge Grapplers. No other mods. Happened in Feb. of last year, right after snowpocolypse here in the nation of Texas. LoL It had 37k miles. It was throwing the D050 and a P code. I don't remember the exact P code. I've gotten a new phone since then, but it was something similar your P code. Warranty fixed it, even though I had the tune on it. It had two bad injectors; #5 and #7. I don't know which was which, but they said one tested at 50% and one at 70%. I use only Top Tier fuels, but I bought the truck with 34k miles, so I can't say how it was treated before. I do know that the check engine light was fine until I put the tune on it. At first I was turning off AFM, and increasing the red line in addition to the tune. I played around with different combinations. In the end, it quit coming on with just the tune. For about a year, then in Feb it started coming on even without the tune. For what it's worth, I had the same tuner on my 2014 before it. That had 5.3L with 6 spd, K&N cold air, Flowmaster cat-back, and 33x12.50x20 Ridge Grapplers. I traded that on the 2017 at 78k miles. Never had a problem.

[@britthaley1118]

Sounds like the lifter issue. My 2020 GMC 5.3l has had both sides replaced under 12500mi (10k mi on driver side and 12400 mi on passenger side). The issue started and ran rough for a couple days off and on, no crazy noises coming from engine. Service ESC and parking brake lights came on and stayed on which, per GMC, is what happens with the lifter/misfire issue. They will only replace lifters on both sides of the vehicle is under 8k miles. They determined which side the issue was coming from and wouldn't agree to replace the other side. After cracking open the engine, they found the other side had already been replaced... Ask the dealer for the 100k mi warranty extension!

[@michaelpanacheese604]

Last winter my truck had same problem. It was bad fuel in the end. Added std red bottle. And let truck run for 15mins

[@Donslife]

I run the highest octane we have here (91). Shell and Costco. Time for some jet fuel treatment!

[@michaelpanacheese604]

Good luck hope your beast runs better after the jet fuel 💪 👍

[@Maton79]

the samething Happen to me today! on my 2020 at4, mine was not starting I let it seat for 20 mines and it starts find, but has check engine light on, I should Just take it to dealer? what if check engine light goes off? should I still take it? Thanks Don, keep up the great work bro.

[@Donslife]

I would take it if the CEL stays on. Sometimes there are issues that are temporary and and the CEL will turn off on its own. I would still take it in so if anything happens again, even if this time was nothing major, you’ll have some history to help you if things ever get worse.

[@magoo478]

I got a 22 rst with the 6.2 no engine lights I live in pa sk anyway don’t drive the truck hard only 11k on it noticed a small engine noise yesterday today now it’s makes more of a noise sounds likes it making a noise around the bell housing any issues with this truck with that or maybe rod or bearings issues? All oil changes done so far at Mann motors

[@Donslife]

I would get it checked out

[@M.A.F._Operator262]

Power surging because of the cold. Thicker grounds help.

[@Donslife]

Not a bad idea. I have run heavy gauge secondary grounds on other vehicles before and it seemed to help. Certainly can’t hurt

[@ryansutton5904]

I have a 2021Yukon AT4 same issue and wow this truck does like very cold weather -30 it just lights up like Christmas Tree with errors codes

[@philycheese]

New to the truck world. Don your mod DIY vids are motivating me to do the same with my soon to purchased ‘22 baby diesel. Same body style as ‘21 since GM is doing a split production with old vs refresh. What engine do you have?? Any major issues to anticipate with the 3L diesel AT4?

[@Donslife]

I have the 6.2. I don’t hear much about 3.0 Diesel issues. Just to jeep the DEF fluid in good supply

[@raymond4226]

How are you displaying the Codes on your inforatinment system? I don’t see this option on my 2021 AT4.

[@Donslife]

I use this device from this review. I use it for Bluetooth control of my rock light and interior light colors too

[@06tbss1]

so what was the issue did you get it figured out??? have a 2021 silverado check engine liggt blicks and turns off says engine missfire truck works fine no noises at all took it in and they change all the lifters on one side and its still doing the same thinggg😢 i do have a k&n air intake on it thinking of putting the original air intake it might be that???????

[@Donslife]

Never did find an issue. Full synthetic oil changes every 3000 miles and 91 or higher octane and I have been fine. I had a steering column lock service warning pop up recently, but my research says it it likely a module that needs reprogramming

[@06tbss1]

so your engine light still goes on ? once in a while think ima have to live with that

[@Donslife]

@@06tbss1 I have had a few instances but all related to sensors. The forums are full of reports of the overly sensitive systems reporting bugs. I am happy I have warranty and just enjoy the truck otherwise

[@Jay_mon001]

Hi Don, what diagnostic tool are you using that comes up on your dash like that?

[@Donslife]

I am using a CarPlay AI box that I reviewed with an app installed for my OBD2 scanner made by BlueDriver

[@josephhcondo7281]

Can you not get a block heat for temperature like that..just asking

[@Donslife]

It was plugged in all night. This happened after a 20-30 mins of driving and then parking for 10-15 mins

[@rnava-ho8pi]

i had the same incident happen to me recently, one afternoon, with my 2021 denali. i also just had an after market exhaust installed so i wondered if that could possibly be attributed. i was told by my mechanic to make sure im running mid or high grade fuel on that 6.2, that the low grade fuel sometimes can cause sensor issues. It just so happened that the last 2 fill ups i made were at a gas station i dont normally use and the gas was almost 20 cents cheaper then where i normally go.

[@christopherbarrett7760]

No idea what the engine codes are for but I hope you find out about the ESC and power steering though, I had a 2020 GMC Sierra and it disabled both on me twice for no reason at all, and fixed itself after completely turning off the truck. I do have a 2020 GMC AT4 like yours now so this worries me but I live in good ol’ Texas so cold weather isn’t really a problem here.

[@Donslife]

🤠 I think the P050D cold start rough idle might influence the other systems until it is resolved. ESC, steering assist and the electric parking brake are drivability systems.

[@abdulazizalkaabi3627]

How do you connect the OBD2 scanner to the OEM dash monitor?

[@Donslife]

I use an android-based box that runs of one of the usb C ports. I did a tech review on it in November. Pricey, but has some neat options like running OBD2 software

[@abdulazizalkaabi3627]

Awesome. Thanks a lot

[@dwightspence2294]

2022 gmc 1500 AT4 diesel 3.0 engine light on one week old 600 kms. remote start not working. what could be the problem?

[@TimHancock-h6e]

Nox2 under threshold. My’n comes on and goes off.

[@johnhemm9313]

i have the at4 2022 can I ask how you get the park lights or running lights to blink?

[@Donslife]

If you are referring to a clip in this video with the amber lights, I think I just hit lock or unlock while the vehicle was running. But if you are asking how to make the DRL's flicker, they are just out of sync with the cameras frame rate. Movie magic!

[@theikandy]

P050D is a known code for failed injector, you most likely need a new injector at cylinder 7. P050D is tripped when the injector cannot perform dual pulse mode smoothly during cold start, more prominent at cold temperatures showing which one has failed. Once replaced, you should be good to go. Use a good code scanner and check any other cylinder is getting misfires, they may need new injectors too

[@Carbon15556]

Don is a weather related issue…think about it! Cold temperature affect spark plugs , they actually clean their self when they are extremely hot and been in a cold weather that spark will not produce that intense flash need it to move that cylinder making the computer read a misfire……misfires occurs as you know when you do not have one of the 3 principles, gas, fire and oxygen…you have two guaranteed, the other one is not flashing properly…..try to put your vehicle inside your garage for couples of days, clear your codes and see if the problems comes back…I suggest even wait until your weather goes excessive cold to test…..I think it will light up again because your spark plug is a factory one, its not made for that type of weather. Let me know how it goes…I have a 2020 GMC Denali 5.3 but am in Florida…add metal lube to your engine , will decrease friction inside your engine and don’t void your warranty , great product to use. Take care.

[@Donslife]

Thank you sir. I looked into the additive you recommended. Not available in Canada 🇨🇦

[@alexrodriquez6574]

I hope it is nothing serious. Not sure if you are aware of the lawsuit against GM for them knowing about the lifter issue and not doing anything to remedy it. I have a 2021 6.2 AT4 with a little over 4500 miles. Love my truck just like anyone else, so I hope they find a remedy fast before it gets way out of hand.

[@Donslife]

Thanks Alex, follow-up video launching today or tomorrow

[@kevinstone9825]

I have a 6,2L Silverado with 6,000 miles and the check engine light has come on at least 6 times since new. The dealer says the code said wheel speed senor but they drove it with no issue, said it was reading correctly. the check engine comes on only for a short time after turning the truck on and off a couple of times.it goes off. I also have a rattling sound from under hood somewhere it is really bad when I cold start but then goes away, but when driving I can hear the rattle around 1,500 rpms with light throttle. it use to rattle every time I came to a stop but when driving in L9 it stopped when coming to a stop but still rattles at 1500 rpm or cold starting..I think the rattle has something to do with the dfm but not sure, if so L9 does not totally stop dfm from working, so I am just waiting for it to blow sadly. I am not sure want I want next as this dfm BS is getting old for the money I spend..BTW I always drive in L9 hoping to prolong it from blowing up

[@Donslife]

Thanks for the info - good context

[@Bretzel18]

Hey man, how do you get the infotainment system to display and read codes?

[@Donslife]

I installed an app from the google play store for my OBD2 scanner with one of these boxes: How To Unlock Your Infotainment Screens By Adding Apps Like Netflix And More kzbin.info/www/bejne/aaW3oYGGo7R0nqM

[@Bretzel18]

@@Donslife that’s so cool! What obd2 reader do you have and what App did you download?

[@Donslife]

@Bretzel18 here is my Linktree. Look under Any Vehicle : BlueDriver OBD2 Scanner tr.ee/yDQPkDi-aX

[@Donslife]

@Bretzel18 it has an app to download when you buy a scanner

[@francof6383]

love your channel how do you like the 2023 sierra at4 front end different look

[@Donslife]

I like it just fine. Especially if the front end is body color matched or black

[@fernandomolina27196]

Hey don don't know if you can help!!!!!!!! I've been a big fan since day 1 and I wanted to know if you can help with locating fuel pump driver control module 2021 yukon. In the states they are on national back order. Don't know if yall are having the same issue.

[@Donslife]

What is the part number? Is it 23382215?

[@Donslife]

It might be tough since I would think that all of the parts departments can locate inventory in other locations. Worst case scenario you can call the auto wreckers.

[@fernandomolina27196]

That's what I was thinking 🤔. But might void my warranty

[@danmagill7616]

Hopefully it’s not the dreaded lifter issue. I noticed on the GM accessories website under performance options they pulled their own performance CAI, and no longer offer it nor recommended installing it, even though you could have ordered this from the factory as a performance upgrade. Not sure if this goes for all brand CAI units. Also not sure if this somehow indirectly causes or relates to the common lifter problem, but I’m sure they had a reason for no longer offering it. There has recently been a class action law suit filed against GM for the lifter issue dating all the way back to 2011 or so. It’s not just the 6.2 but also the 5.3 and 6.0 engines. The question is if these lifters are failing, are they just replacing them with the same new lifters? If not, and it’s a new completely different or redesigned lifter, then why are they continuing to put the old defective lifters on new trucks being built? I understand why for government fuel regulations as to why they came up with DFM, and all the different combinations that the cylinders can run on, they just need to develop a lifter that can handle the task. I have a 2020 trailboss with the 6.2 with approximately 12k miles. No issues yet. Activity shopping the Borla cat backs which led me to your channel. Best of luck, keep us posted.

[@Donslife]

I will keep everyone posted. Right now it has been fine and still ridiculously cold here. I don’t think the CAI’s are a contributing factor. I am hopeful it is a fuel delivery problem. When it is so cold for so long it can happen. Gas line antifreeze is a pretty popular additive in this part of the country for a reason. 🤷🏻‍♂️

[@ryanbonser361]

Were you able to view diagnostics/codes right from your info screen? Is that standard feature or something you have that will allow you go do that? Good luck hope its nothing

[@Donslife]

I have an android box I reviewed in November that lets me upgrade some of the infotainment options. In this case using an OBD2 scan tool with the main screen and not my phone

[@patl8363]

Nice truck. I have the exact same model and color of yours but the the poor man's version, elevation, and 2022. Haha. My first gm in a long time. Love the truck so far. I have 4400 kms on it and no problems so far except I have to take it back for paint problems on the box both sides in front of the wheel. Covered by warranty I'm told. Not sure if anyone else has this problem. Like your channel. Keep up the good content. Can't wait for the warm weather it's cold here in alberta too.

[@Donslife]

Hello my AB neighbor. I have lived in Alberta for about 20 yrs ✌🏼

[@JPGwinn]

wait you haven't programmed your garage door opener? Come on this is Don's Life!!! :)

[@Donslife]

😂 of course all 3 homelink buttons are programmed silly

[@happyman9612]

How did you get the codes to show on the truck's infotainment display?

[@Donslife]

I installed an Android device in another video that can use the infotainment screen for various Android Apps

[@slik056]

Already had to replace the injectors on my wife's 2017. Along with the transmission, the mag-ride shocks, and battery cables... this thing has been a constant money pit.

[@Transporterw12]

How did you run the test from the screen?

[@Donslife]

With one of these boxes

[@Donslife]

Ultimate In-Car Entertainment: Add Apps & Wireless CarPlay and Android Auto to Every Screen! kzbin.info/www/bejne/aaW3oYGGo7R0nqM

[@tannerpeterson5101]

How were you checking the engine codes on your AT4?

[@Donslife]

I use an OBD2 wireless Bluetooth scanner. In the video I was using it right on my infotainment screen via an Android box (I reviewed in November).

[@egpuppet]

I got a check engine light on and an error code P0106 and took my at4 to the dealer. They swapped the Map sensor. Then in a few days it lit up again the check engine light. Took it in to another dealership and their excuse was that they couldn’t check it cause it had the s&b cold air intake 🤦🏻‍♂️. And now I got a message that says brake system failure 62mph top speed. Nothing is wrong with it it seems to be running fine 🤷🏻‍♂️ what do you recommend. Thanks in advance.

[@Donslife]

I am going to make a follow-up video soon enough, I don't really have specific advice. If anything I am more confused then before I produced this video LOL. Dealerships vary on what they will look at or not; Some could care less about aftermarket intakes, some run away. Myself, I might try putting in the factory intake for a bit and see, then switch back a week later to compare.

[@DarkenFool]

Does your dash (especially near the screen, HVAC, and Auto star stop area) flex and make cracking/popping noises at random? Almost like the trim isn't set right. Its -17 in BC or was; as the truck warms up the dash area where i described above cracks and creeks at random. It does not rattle or anything just sounds like plastic flexing and popping. I hear it when i'm just cruising around. Took it to the dealer once and of course they said nothing was wrong. Curious if im the only one. Plus my HUD still shakes but apparently they can tighten retaining brackets.

[@Donslife]

No sir, I also have been examining my HUD for shaking and vibration. It is pretty good except maybe the littlest fonts on the Navigation can be sometimes a little off on a bumpy road. Very little shake though or maybe my eyes are old

[@kkoch666]

All kinds of cheap plastic pops and creaks with mine, HUD is fine.

[@DarkenFool]

@@Donslife You're very lucky! I feel like mine is slowly falling apart (inside). My Heads up Display dances around like it's karaoke night, seats squeak on the outer edges (door side) (both passenger and driver), camera for rearview mirror has a brown contrast, dash noises probably due to the cold. Mirror swivel is now loose, lots of vibration in the mirror just driving around without the camera on. (normal mirror mode) 3.0l Duramax is pretty great though.

[@TheAeroBanana]

Any opinions on the 2023 electric Sierra announcement?

[@Donslife]

Honestly I tend to wait and see now (in person) and get less caught up in the announcements. For me it is frustrating when something gets announced and then you have to wait for prototype reviews. I am excited, but my biggest hope is they set the bar for e-trucks and don't just play it safe.

[@robgarcia320]

Did you ever get engine code when installing cold air intake? Running to lean.

[@Donslife]

I have ran two. S&B and Cold Air Inductions. Neither seem to be the cause for the misfire

[@michaelfenton4878]

Hey Don, great job on the videos. How did you check and clear the codes on your infotainment system? I have a 2022 GMC Sierra (new body style). There doesn’t seem to be anything wrong with it but it would be nice to check for fault codes now and then, or if something does go wrong it would be nice to know how to check the codes. I have a wireless OBDII device that connects to my phone. It works on my BMW but not on the Sierra. Thanks Don!

[@Donslife]

Hi there 👋🏼 I use the Android device in this video. It doesn’t have to be this specific device, but it works for my diagnostic software and also displays graphics for my auxiliary light and rock switches: MAJOR UPGRADE for Your Existing Wired Car Play or Android Auto! KZbin and Netflix! kzbin.info/www/bejne/kIqycn-EqLOtpqs

[@michaelfenton4878]

Thanks for the reply, Don! I’ll check out that video.

[@Mandob11]

Let us know what you find out. What build date is your truck? Love the truck have same one🙌🏼.

[@Donslife]

Will do! Build Date is January 2021

[@ww4575]

Sorry bud that’s the lifters going out. My 2020 Sierra did the exact same thing. Best go ahead and take it to the dealership.

[@Donslife]

Is it bad I want you to be wrong 😑

[@ww4575]

@@Donslife hope i am. But mine started out with the exact same cylinder misfire, i cleared codes and went about my business then lifters went out and then it sat in the dealer ship for two weeks.

[@Bear_83]

Do you have an Engine block heater?

[@Donslife]

100%