How to Fix Reduced Engine Power GMC Yukon

How to Fix Reduced Engine Power GMC Yukon
Parts Used
Throttle Body amzn.to/3MV2goS
Throttle Body Gasket(if needed) amzn.to/3ubQXjy
Tools Used
8mm amzn.to/3N27TS9
10mm amzn.to/36twKhd
Inch lb Torque Wrench amzn.to/37HV8MA
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Other Parts Used on This Yukon
Wheels ebay.us/6GEVP0
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Flat Black 52 Chevy • Slammed 52
1998 WS6 Convertible • 1998 WS6 Convertible
So as I talked about in the first video on this thing. We had an issue with reduced engine power. This is a common thing on gmc yukon, chevy tahoe, chevy silverado and gmc sierra. I also had this issue on my chevy suburban. While several people read the codes and choose to buy an aftermarket throttle body. That really doesn't always fix the issue. Aftermarket drive by wire throttle bodies especially on gm vehicles always seem to have issues. This causes you to spend more money on parts not needed. While I know others have had issues with grounds on these suvs. It was not the issue here. If you are in a cold environment or it usually happens in the morning, chances are it is the throttle body. The gm throttle body will start to show issues in the cold and will cause the reduced engine power mode or code. This is a simple fix and I also give you the torque specs for a gm dbw throttle body. Hit the Comments and let me know what you think.......
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[@beejay8719]

Awsome!! Tried several years ago to clean mine. Just cleaned up front because I could get it off. Never thought about the hoses. Well at that tines wasn't as mechanically inclined as i am now. Way better throttle response after. Thanks for the video

[@TWAMotorsports]

Thank you. This one actually feels more responsive

[@Bham98]

sold him this truck been in the family for years but it’s in good hands now 🙏🏼

[@TWAMotorsports]

Thank you for selling it to me. Way more to come.

[@jjslowhand]

Hey Travis I cannot thank you enough for your vid on the '04 Yukon Denali. EXCELLENT ADVICE SIR! Finally, I am Cruising in same vehicle, my daily/only driver:) As you predicted/mentioned, my problem was SOLVED by R&R THROTTLE BODY W GENUINE GM PART. When I removed the 1 year old TB that local shop replaced, guess who? Of Course it was an aftermarket Remanufactured Hitachi TB from Taiwan, that was purchased from a normally reliable source that begins with a Capital N. AGAIN, YOU WERE CORRECT that some of those are bad right out of the box or fail soon thereafter. Mine failed 4 months after install & I limped, and limped and almost gave up. Spent lots of money. Shop finally told me: "Cannot Fix, Take it to a Dealer In Miami". That's all I needed to hear and decided to TAKE TRAVIS' ADVICE and replace it myself. Detaching & Re-attaching those coolant hoses underneath w/o proper tools was a major hassle but your vid gave me confidence that I could finesse that w needlenose & handle this repair. Bolted on & she started right up, no idling issue. Put a couple hundred miles on it before I posted SUCCESS to you. Thanks again Brother, You are the best!

[@TWAMotorsports]

That is awesome. I love to here that. Just can't trust aftermarket ones honestly

[@womanofdestiny84]

Was your Tc light on as well?

[@TWAMotorsports]

Occasionally

[@Beardedgarage90]

I’ve been dealing with the reduce engine problem for about 7 months I’ve replaced the throttle body with a duralast one since a GM one wasn’t available. And man this is the 3rd one I’ve swamped and it only works for a day or two. Always in the morning it would go into reduce mode. And in the afternoon there is no problem at all. Seeing your video now has me thinking i should buy the GM one. The duralast one made a noise like yours did when i picked it up as well. Thanks for the great video. I hope i am able to fix it with the GM throttle body.

[@TWAMotorsports]

I bet that will fix your problems

[@lsxpablo]

Your videos are actually really helpful and you in depth on everything

[@TWAMotorsports]

Thank you

[@jasonperez4775]

Thanks for being so detailed. I have very limited mechanic knowledge so this is very helpful. The problem just showed up on my 05 yukon last night. I am going to try and give it a shot this week. thanks again

[@TWAMotorsports]

You're welcome. Hopefully you can get yours fixed

[@kylemoran4699]

Looking forward to seeing you putting your touches on this Yukon. Vote for removing the roof rake. I made another ground for my Tahoe too.

[@TWAMotorsports]

Thank you. Yeah it's going to look different, thats for sure

[@transam4555]

Awesome fix, learned something today. I'm planning on getting one of these for family trips. They go for dirt cheap down here in south Texas. Great video Mr.T.

[@TWAMotorsports]

Thank you. They are good reliable vehicles generally

[@ryans6449]

Where in south texas

[@TWAMotorsports]

No idea. I looked there and couldn't find one.

[@albertrivera4689]

Great Video!! just bought an GM brand throttle body, almost went the after-brand route.

[@TWAMotorsports]

Definitely best to go with GM

[@JR-oz5mf]

I had the same problem on my tahoe. Went to the junk yard and got a used one and it fixed the reduce engine power.

[@TWAMotorsports]

Nice. That works too

[@tmac90]

Great video dude. Simple job now I need to do is get the part.

[@TWAMotorsports]

Thank you

[@danielhibbard2391]

Great video I agree with some aftermarket parts can’t trust them

[@TWAMotorsports]

That's no kidding

[@joswikjones]

Thank you for the video, hoping this improves my quality of life drastically! Bought an 03 yukon xl with 250k mi 3 yrs ago on the cheap. still has a few annoying issues. Reduced engine power, oil pan leak, always says right rear door open and check brakes, and dings incessantly, alarm goes off randomly😂 I’m not mechanically minded but have been able to fix various stuff.

[@TWAMotorsports]

Sounds like you may have a bad bcm

[@davemarriott9332]

Excellent excellent video. We’ll explained and executed

[@TWAMotorsports]

Thank you

[@VenomWorks]

Such a simple fix haha, glad it's running good now man!

[@TWAMotorsports]

I know. Nice to have it running good. Took it on a 10 hour drive last weekend

[@efrainherrera5683]

I hace the same problem and is inmigrantes pain in tha you Know what

[@losmoore3358]

U did good on your fix. Im having same issue on my 2005 chevy suburban . I let off the gas it boggs down like its getting ready to die with a tremble.

[@TWAMotorsports]

Thank you. Good luck on yours

[@neilyakuza6595]

Mine has the same issue. This is a promising video.

[@TWAMotorsports]

Good luck

[@jeffgraham48]

Ready to see it transform! I had a red 05 years ago i miss. Low with some wheels and your cleaning on it.

[@jeffgraham48]

Yes shave roof rack.

[@TWAMotorsports]

Its coming

[@TWAMotorsports]

Definitely

[@masl2004]

My 03 Silverado 6.0 was showing the "reduced engine power" as well one morning, so I cleared the codes and it runs totally fine now. I think it was just due to the cold the one day

[@TWAMotorsports]

Which means throttle body is on its way out

[@freddiehudson2936]

Your vids are great. Keep doin.

[@TWAMotorsports]

Thank you

[@burro5808]

hope you do a double din next this yukon is super clean

[@TWAMotorsports]

Has a factory double din

[@keilylmm6377]

Good Thursday evening Travis. I'm just getting home from work and getting settled in having dinner with my wife. My wife's birthday is tomorrow so we are going to have family over tomorrow night... My wife and I will be tuning in to your video in a few minutes..

[@TWAMotorsports]

Thank you Keith. Tell your wife happy birthday. Have a great night

[@glenhalstead2301]

Man, that thing looks almost new from the outside shots after you replaced the throttle body. Nice buy!

[@TWAMotorsports]

Thank you

[@jonshackelford1156]

Definitely, delete the roof rack so much cleaner look. I’d love to see how to do that to mine. Love the channel, your up there next to that Giraffe guy from Florida, as my favorite channels to watch. Side question if you don’t mind. How do you get the caps, over the bolts/ nuts of the windshield wipers off with out damaging them?

[@TWAMotorsports]

Thank you. Will have a Windshield wiper removal video soon

[@tomasmartinez7349]

Add a Corvette Servo to the transmission, it will help in shift points and acceleration . My transmission was having the same issue with gear delay every time I try to make a pass . The Corvette Servo is the best way to go . It will increase your transmissions life.

[@TWAMotorsports]

I have done that in the past

[@DylanRamos425]

My 03 has the same issue! Going to try this out and see if this helps. Thanks for the video!!

[@TWAMotorsports]

Should fix your issues

[@Numbersactor]

Did it fix it cuz mine will not go away replaced basically everything that is t the wire it’s self

[@TWAMotorsports]

Gm throttle body?

[@Numbersactor]

Most likely not my father got it for me and I put it on I can check if it is gm and if it’s not where can I get a gm trottle body.

[@TWAMotorsports]

@Numbersactor from a dealer

[@watuzi]

I got an '05 that just reached 200K. Great cars that are easy to work on. Can't wait to see what projects you got in store.

[@TWAMotorsports]

I agree. Pretty reliable vehicles

[@nickp66104]

@@TWAMotorsports you happen to be in midwest?

[@TWAMotorsports]

I'm in Missouri

[@juanbarajasp9283]

My girlfriend has the same problem 05 escalade with reduced engine, I'm swap from my 04 escalade drive it, hope that fix it. GOOD VIDEO

[@TWAMotorsports]

Thank you. Hopefully it will fix your issue too

[@jewllake]

the rattle in the throttle body is normal when you rock it from side to side. I bought a new GM TB ported by kaytech for my 2018 6.2 and it made that sound. I was a little concerned, but then I pulled out the original one from my truck and it did the same exact thing.

[@TWAMotorsports]

Maybe thats why the other didn't work. It didn't make that noise. Lol

[@manuel_r1426]

Good video 😎🔥

[@TWAMotorsports]

Thank you

[@BigBvby1016]

are you going to make a Yukon build series that would be awesome . you could swap the roof racks for escalades' . I've got escalade trim on my Yukon. roof racks , running boards , rear bumper, rear window with third brake light and rear pillar vents . and it makes it look like an upgraded trim package .

[@TWAMotorsports]

I am. Not planning on adding any escalade parts.

[@markb3129]

My 2003 was getting hard to start and was intake gasket causing it🤔. Roof rack needs to go. Hopefully you will install electric fans, thinking about installing them in my 2000 chevy truck.. ✌

[@TWAMotorsports]

Thank you. Yeah this probably needs those too. Lol. Electric fans will come eventually. I did that swap on my green nbs truck

[@frankm8533]

I'm not even a GM guy but my friends have 04 Tahoe they bought new 5.3 it has 439k miles motor is original but two transmissions still looks great it's a weekend dog hauler these days. Looking forward to the TWA touch on this one

[@TWAMotorsports]

Thank you. Yeah they are tanks.

[@nestorcaamano307]

I totally agree with you I bought one for my 04 suburban and it got worst and know I can't get it to run or turn on I don't know what else to do I haven't been able to run again sucks

[@TWAMotorsports]

Gm one?

[@nb6584]

Also a fan of OEM parts i ran into so many problems before that i thought was because of something else and ended up being the aftermarket part was the issue the whole time. Now i juat look for the best prices of the OEM parts only.

[@TWAMotorsports]

Definitely the way to go

[@DrAlexanderHamilton]

LOVE THIS VIDEO, but one question. why don't you have your lift bolted to the floor? Scary stuff or not?

[@thegoodlife9190]

Hey Travis, Thanks so much for the video. Got a question about my 2007 Sierra 1500 truck. When you said “reduced power” did that also mean it was missing like firing on fewer cylinders? The GMC dealer suggested to rebuild the top half of the motor. The mechanic is telling me it’s stuck in 4 cylinder mode. It has that 8 cylinder, 4 cylinder gas saving feature. My truck stopped running setting at a red light, it wasn’t moving but when I finally got it cranked it felt like it was firing on 2 cylinders. I’ve had small electronic issues in the past but nothing like this and I don’t know if switching from 8 cyl to 4 cyl is done electronically. Have you ever experienced a GMC stuck in 4 cylinder mode? When I get the truck back I’m going to look at my ground wires. Thanks again for the video.

[@TWAMotorsports]

No that is a different issue entirely

[@nathanjones1318]

That was a good buy it looks great but I know ur gonna make it look better plus drop it

[@TWAMotorsports]

Thank you. I am definitely going to be making some changes

[@37sanchez]

Thanks may frend

[@TWAMotorsports]

You're welcome

[@leobardorocha9191]

I change the throttle body a month ago now I have the same problem this make me so stressed...not wat to do.......great video

[@TWAMotorsports]

Did you buy a gm like I talked qbout in this video?

[@leobardorocha9191]

@TWAMotorsports I went to the dealer and they tell me dealer won't sell parts for a 2004 yukon because is to old....is that true????and I have to buy one in autozone

[@TWAMotorsports]

Find a better dealer

[@tanoktenahua1665]

Cool video. My 03 Yukon does it once in a while but doesn't do it when it's cold. It does it after it's warmed up. I can start it fine and drive for a couple miles and once a start it again it gives me that reduce engine power. I just disconnect the harness and plug it back in and it goes away. You think it's the throttle body?

[@TWAMotorsports]

Probably so

[@srtclonbs944]

Those coolant hose under the throttle specifically the left one where does it go to?

[@TWAMotorsports]

One to under intake. One to radiator

[@nestorcaamano307]

Hi travis i have the issue but i already change the throttle body and the black box that runs the throttle and the gas pedal and i left the negative wire unplug over night still the same issue no throttle responds and i turn it off turn it on again runs fine for minutes or less i dont know what else to do i can really use your skill thank you very much

[@TWAMotorsports]

Make sure and check all the grounds

[@hunterbydesign]

I have the same limp mode issue with my 2003 gmc Denali 6.0. It will at times do it when I hit a bump, other times for no particular reason. I can pull off the road sit for 20 seconds, fire it up and take back off. Sometimes I’m good the rest of the drive, other times it’ll do it 5 times in the next 5 minutes. Had throttle body replaced, pedal sensors, knock sensors. Sounds like I need to confirm it was a gm tb and check my grounds. Does this sound like the place to start? I also have weird intermittent cabin lighting issues where they are often dim and then will randomly be really bright as they should be. Think it’s related and any ideas? Thanks for the great vid and comments on here!

[@TWAMotorsports]

Sounds more like a ground issue

[@nbsaddiction1522]

So the p1516 code pertains to the TB I cleaned my grounds as well drove it this morning it being cold did the same thing again I did a plug and wire change 2 weeks ago after this past weekend it started the reduce power and check engine light stays on I noticed in the cab the rpm needle is sitting below the 1on a cold start a bit wasn't like that before the problem arose

[@TWAMotorsports]

I would look at the throttle body especially if it is only on cold mornings

[@capitalr8649]

Did you have any codes before changing out the throttle body?

[@TWAMotorsports]

Yes I did. All related to tb

[@josephscisson5253]

Dope!

[@TWAMotorsports]

Thank you

[@allanheinrich7184]

40 mph , I couldn't get 30 mph when my Suburban acted up. I cleaned the throttle body and that took care of the problem.

[@TWAMotorsports]

Some are worse than others I guess

[@miiiikee_]

The only thing Dorman I trust is my valve stem caps lol. Definitely lose the roof rack if you never plan on using it, looks cleaner and less drag on the roof.

[@TWAMotorsports]

Lol. Roof rack is going away

[@mrbrowz1000101]

Amen brotha. I had a set of Dorman headlight aiming screws for a G-Body (had a set of retrofitted headlights; highly recommended) and those things folded like two pieces of Sunbeam bread. I said never again!

[@TWAMotorsports]

Lol

[@jjslowhand]

It's always hot down here in the Keys so no cold issue. The shop did add additional ground and I am embarrassed to admit how much money I threw at it w several/many different sensors replaced just trying to keep it going through my fishing season. Just can't pull off the road every 5 miles. Now I have time to work on it myself. Btw I have owned 6 older Burbans (pre '99) over 40 yrs and was able to fix the routine issues. Never had a GMC Yukon Denali w all this fancy stuff.

[@TWAMotorsports]

That would be a pain. Hopefully you can get it lined out.

[@jjslowhand]

@@TWAMotorsports Thanks Man. I don't post often but if & when I figure this out i will definitely advise You and hopefully help some of your followers. I am having a hard time finding a TRUE GMC TB for 6.0 '04 Denali Ac Delco ok if i can find one? Thanks for your time and i won't bug you anymore until i fix the damn thing.

[@TWAMotorsports]

Only brand I buy is genuine gm

[@jasoncollado9043]

I'm looking OM TB for my 2001 Chevy Silverado 2500hd Chevy dealer says discontinued any ideas?

[@TWAMotorsports]

That is a cable throttle body. Different deal than what I address here

[@jjslowhand]

Excellent vid Sir. I also have an '04 Yukon Denali XL that I bought 5 years ago w 170K/223k now. Same color but yours looks much nicer. It is also my daily driver and I use it to tow a sm skiff for my charter biz. Always ran perfectly. Love it! Many months ago the T/C light would come on periodically and it would go into Reduced Power mode. Pull off the road, wait a few seconds and restart and all is fine for approx 5 miles. Took it to my local shop here (I had to get it running ASAP & did not have time to R&R the TB myself) in the Keys and they replaced Throttle Body and both front wheel sensors. Ran fine for 4 MONTHS, now I have the same problem constantly. Undrivable now. They used an aftermarket TB. I would sincerely appreciate any advice. R&R TB w genuine GMC part? Thanks again for the explicit vid. Please advise Sir. Thank you very much.

[@TWAMotorsports]

Probably the grounds or throttle body. I would start with the throttle body

[@jjslowhand]

@@TWAMotorsports Copy that loud and clear. Thanks for quick reply.

[@TWAMotorsports]

You're welcome

[@The210satx]

You should install a set of Escalade rear pillars

[@TWAMotorsports]

Don't love painted ones

[@marciaricker6317]

i noticed you moved the oil fill neck back in place when moving the harness out of the way. Is that normal for the neck to move like that?

[@TWAMotorsports]

Some older ones do

[@chieftejay]

My truck has same prob what type of wire you used for ground wire ? Any specific or type of wires you need or how thick they need be ?? Lmk Plz

[@TWAMotorsports]

10 gauge I believe

[@tanoktenahua1665]

My 03 Yukon does it when it's warm up. I'll come back from work and if I start it again to go anywhere else it gives me that message. I have to turn it off disconnect the throttle body harness and plug it back in then it goes back to normal. I'm kinda leaning toward the throttle body as well. What do you think it is?

[@TWAMotorsports]

Could be the issue. Generally is

[@duaneadams1358]

I believe I have this issue on my 03 yukon. It was coldish this morning...dead battery, jump started it, and reduced engine power message was on along with disabled system stability. Had no power at all going up my driveway.... Shut it off a couple times..second restart it worked fine...messages gone.

[@TWAMotorsports]

Probably on the way out

[@christianderby806]

I’m having problems when I try and get on it there no power it stops me but drives just fine when I don’t accelerate fast I replaced spark plugs wires maf sensor and pedal accelerator sensor I’m wondering if it’s my throttle body also I dont have a check engine

[@TWAMotorsports]

Could be but not sure

[@nathansmith1654]

When mine does this I can pull over, shut off the engine for 10 seconds and start it back up. It will though do it again on and off on me within 5 to 10 miles. Thank you for your video!

[@TWAMotorsports]

Probably need a new one

[@bigcountry7096]

That is the pigtail that goes to the throttle body I had the same symptoms changed the pigtail and it didn't reduce engine power for months but then it came back some how

[@TWAMotorsports]

Junk throttle bodies

[@user-jz9ln6ut6b]

Of course it's gonna work you reset it with the battery disconnect. My question is what happened a couple days later? Did the issue come back???

[@TWAMotorsports]

Not after replacing throttle body

[@XxTh3N1ghtmarexX]

Did you have p0220 and p2135?? My truck is stuck in reduced engine power and I can’t find the problem.

[@TWAMotorsports]

I did

[@briizcustoms9543]

What things do you do to increase gas mileage? Clean sensors, gas type etc? I use E87, that’s it. No mods etc.

[@TWAMotorsports]

Generally that isn't a concern of mine

[@kevint.4249]

What gauge cable do you use for extra ground cables??

[@TWAMotorsports]

10

[@freddiehudson2936]

Keep the roof rack. I have an 04 yukon slt. I just recently upgraded my tail lights. After I installed the tail lights and put in LED bulbs my cruise control stopped working. My switch is brand new and my fuse is good. I've researched that the new tail lights could be the problem. Lemme know what you think.

[@TWAMotorsports]

I did upgrade lights and no cruise control issues

[@enriquelopez6033]

Had the same issue it was my LED bulbs that didnt have the right resistors and went back to stock bulbs and wala cruise control works again

[@TWAMotorsports]

Yeah apparently that is common

[@erwins.7007]

Will this throttle body fit 05 chevy tahoe ?

[@TWAMotorsports]

Yes

[@JunoSixTwenty]

P1516 will pop up and go into reduced power mode randomly after i am already driving for a while. Ill pull over and turn my truck off and turn it back on and it goes away and i can drive normally again. The regular driving does seem kinda sluggish though.

[@TWAMotorsports]

Might need a throttle body

[@duvalle2004]

I changed out my TB and the pedeal censor , and on a cold start it still shows reduced power and check engine light. Any advice???

[@TWAMotorsports]

Gm throttle body? Check all the grounds?

[@Joshsotojustss]

Im having the same issue but also another issue where it will have a very slow crank in the morning but it will start and it will say reduced engine power ill let my truck warm up turn the truck off start it couple times and it the limp mode goes away but do its the tb or could be something else ?

[@TWAMotorsports]

Yes. Tb isn't responding

[@Joshsotojustss]

@@TWAMotorsports Okay ill swap it soon for a GM tb and ill lyk thanks man

[@firebirdloft]

Hello sir, my chevy express doing the same when i hit a bump..I changed throttle body position sensor, worked for a couple hours then i took a bumpy road and problem came back..any idea?! Thanks!

[@TWAMotorsports]

Sounds like a ground broken or frayed

[@firebirdloft]

@@TWAMotorsports thanks, I’ll check that and I’ll check throttle plate. Thanks again

[@TWAMotorsports]

@firebirdloft back of heads too

[@Cammed300srt8]

Good afternoon been following you for a while ima big fan of lowered suv tahoe Escalades Yukons etc I recently bought a 2004 Escalade awd are torsion bar keys enough to lower the front or should I order a kit with spindles

[@TWAMotorsports]

Torsion keys will generally only get 2 inches

[@Cammed300srt8]

@@TWAMotorsports ok cool cause I found a rather cheap kit on ebay with torsion keys for front and 4” springs for rear with shock extenders

[@TWAMotorsports]

It will never get in alignment with keys unless you change upper a arms

[@user-dq7iy5nv5d]

How can I replace my sunroof motor, 2002 Cadillac escalade ext, 6.0 liter

[@TWAMotorsports]

I'm sure but have never done it.

[@BeardsandCars]

I always put ac delco parts on my all mine..learned this along time ago...they just don't seem to like other parts.

[@TWAMotorsports]

Not sure how other companies can get away with the crap the sell

[@BeardsandCars]

@@TWAMotorsports me either

[@moejr14]

@@BeardsandCars do you have a link?

[@BeardsandCars]

@@moejr14 link for ?

[@moejr14]

@@BeardsandCars my bad I thought I was asking Travis. Link for the TB

[@lrsorganizing]

Hey Travis. Can you tell me how to fix an engine that leaks lots of oil?

[@mtsanchez27]

Replace seal bro

[@TWAMotorsports]

Fix the gasket its leaking from.

[@TWAMotorsports]

👍

[@sikes185]

I have a question. Did you get a code when it was running bad on cold crank up? My 04 Yukon will run like crap on a real cold morning on a crank up. Seconds later it runs fine. Black smoke out the tail pipe. Code shows 071 and 074. May be 171 and 174. Any who. Those are left and right bank lean. Going to change my 02 sensors and see what happens. Original throttle body on her. Oh and I took my roof rack off and love that look

[@TWAMotorsports]

Yeah that sounds like a different issue

[@sandymilne224]

I hear that there are 4 O2 sensors on my 1999. Which ones should I replace? Left and right banks ‘lean’ is the code

[@sikes185]

@@sandymilne224to be honest I have the sensors for the front. I just have not replaced them yet. I don’t know if this is the problem. But I think it is a good place the start.

[@sandymilne224]

@@sikes185 : Thanks for the comment. They are not cheap to buy quality ones. Without testing the OHMs of everyone of them, I was wondering if the fail rate of specific ones is more common. I’d start by replacing those first and go one-by-one through the system. Just wondering if anybody knew which ones ‘go’ more often than the others.

[@sikes185]

@@sandymilne224well my thoughts on this is. The code reads left and right bank lean. If it was just reading left bank lean then I’d go with one. But sense it says left and right. What the hec I will replace both. I mean it’s only money. You can’t take it with you. Lol

[@kb9liq]

mine only does it when it is really hot out. Is it still a throttle body? Winter time I normally do not have this problem

[@TWAMotorsports]

Could be or a coolant temp sensor in the driver side head

[@kb9liq]

@@TWAMotorsports Well now the pedal does nothing so I'm wondering if it in the pedal sensor

[@TWAMotorsports]

Could be

[@spinningwheelsmedia]

I’m having a similar issue on my 03 avalanche it has the p1518 throttle body code, it runs like a dream until I turn the air on, then it goes into reduced power mode. With the air off it is fine, there is a new aftermarket tb on it should I change it to a gm tb? Why do you think it gets triggered by the ac/blower motor

[@TWAMotorsports]

Could just be a broken ground

[@spinningwheelsmedia]

@@TWAMotorsports I went through and made several new grounds already, and fixed a shotty splice job on the blower motor with no luck. I was reading review on the tb which is a hitachi, and many of them are saying it's garbage and only works for about 5 months. I don't know how long it has been in there I just bought the truck a couple days ago

[@TWAMotorsports]

I doubt its rhe tb if it only happens when ac is on

[@spinningwheelsmedia]

@@TWAMotorsports I brought it to a mechanic friend of mine that specializes in electrical we narrowed it down the the ac compressor, replaced it and it's still happening. Looking at the wiring diagram the compressor runs into the computer that controls the TCM were going to isolate it and see if it works he's thinking it either needs a computer or it could be more of a mechanical issue, I'm leaning towards computer, when the code is off it runs great

[@TWAMotorsports]

Crazy

[@jgrc4588]

Was your reduced engine code somehow associated with rain, water? I replaced the throttle body and related sensors and the problem went away. For a little while anyways, but it came back shortly after, one thing I noticed. The reduced engine power code always showed up after a car wash or every time it rained. It is my understanding that there's a service bulletin from GM related to this fault.

[@TWAMotorsports]

It can be. These throttle bodies are temperamental

[@jgrc4588]

@@TWAMotorsports Thank you for your feedback.

[@TWAMotorsports]

You're welcome

[@moejr14]

Is it still working? Is your amazon link for the TB a legit one?

[@TWAMotorsports]

It is. Iy should be gm one

[@fezcarstuff5851]

For my situation it isn’t the throttle body, I bought a new throttle body, coil packs, spark plugs, wires, but yet it still gives me this issue. It’ll even cut mid drive and buck and eventually die and not start again.

[@TWAMotorsports]

Its a ground or throttle body. If you bought a non gm throttle body I would start there after ground connections

[@joe-tf2vx]

All I did was run a ground from the ECU to the negative battery terminal and fixed the problem

[@TWAMotorsports]

Mine was definitely the throttle body

[@williamwatson8796]

Many People say Ground the ECU - Body " but My 2000 Yukon XL has A Black Plastic ECU Body ( box unit - that Snaps in place to the Driver's s Side Firewall. So I take it That I Should Distinguish Which of the Connector Wires is The Negative, and Ground That one to the Neg. Battery Post...?? ). Also - I experienced the " Reduced Engine Power " Syndrome, while 2- blocks from My Home, Just Trying to Go to Work, at 5:30 am. The Vehicle Showed Numerous Codes, and Many Dash Lights, would Only Drive 7 M. P. H. - back to the House... To Switch out Cars.... It put Me into a Panic, I thought the Yukon was Ruined... Or would Cost $800 to $1200 to get it Fixed... As I was Having codes ( 0452 EVAP Pressure , Low Voltage , " which I bought a New Fuel Press. Tank Sensor... But Never Installed it Yet, then came the 0332 Bank 2 knock Sensor Error Code. Well... I Was Late for Work and Very Frustrated.... So I thought Carefully , to Disconnect the Battery Post Cables, and Let them Sit until 5:30 Pm , when I got Home... I touched the Red/ Black Cables together to Remove any residual Computer Power... Then I used a Steel 5/8 " hand Brush, and removed the Battery Bolts from the Rubber Cables, And Scrubbed the Hell out of Every Possible Battery Surface, then Cleaned the Bolts, there was an Unseen Dry Yellow Sulfur Powder Present, Blew it all Away, Reconnected Cables , Snug... Crossed My Fingers, and Started the 5.3L Yukon... Only , the Idle Needed to Re- Learn.... I took it for a Calm Test Drive, to Re- Learn , My Driving Style... Everything was Perfect, it Ran Normal Again...!! Although, the Codes 0452, and 0332 still pop up... Until I address those Semi - Difficult Issues To Swap out Fuel Tank Pressure Sensor, and to Remove the Entire Intake Manifold Plate, and Buy - Quality Knock Sensors. And Install PROPERLY, WITH MINOR OIL DRAINING / POOLING MODS... THAT I SAW ON A KZbin VIDEO I DO HOPE This has Helped Somebody.... Before - You Start Throwing New Parts at the 5.3L engine, or Taking it to DisHonest , Scammer Mechanics... That Don't Tell You, what it Took to Remedy the Errors... BillinL.A. 7-29-22

[@toodjackson4438]

I got the same problem but mine might do it twice a week or it might go three weeks before it doesn't it

[@TWAMotorsports]

It will eventually be all the time

[@tylerculwell9292]

Can anyone help me understand why my driver window will roll up when I cross the wires but won’t work with my brand new button that I can hear click with power and all the others work fine And I crossed the wires at the pins on the connectors

[@TWAMotorsports]

Nope

[@omarzowila]

What happened to the brown Yukon?

[@TWAMotorsports]

Green one is my wifes daily

[@danorourke5184]

How much you going to lower this one?

[@TWAMotorsports]

Probably 3/4 ish

[@TaNiyaTaylor]

My 2008 suburban goes into engine power reduced when I hit a bump. Does anyone know the problem?😢

[@TWAMotorsports]

Abs line would be my guess

[@JoseVega-hw8qb]

Hey so I got 2000 yukon denali, i got a problem where i drive it from work to the house about 5 minute drive i go to start it after like 30 minutes of sitting and its an Intermittent long crank and it used to not start till the next day i had the security system fixed and i still have the long hesitating cranks and now that it cold out i have it outside and it loss of power till it gets warmer then runs fine. Had it in 3 different shop no one can tell me what it could be. Any ideas? Thanks in advance

[@TWAMotorsports]

Sounds like a fuel pump on its way out to me

[@JoseVega-hw8qb]

I put one on my self did the same thing no change and i had a shop change it out as well and nothing has changed

[@TWAMotorsports]

Sounds fuel related to me

[@bryanbrunk1186]

What was the code the truck was giving?

[@TWAMotorsports]

P0120 P2135. Both gone now.

[@robadams2274]

I have this same problem with my Yukon. Got a new TB and harness installed at dealer and 3 months later the same problem started back up. Pretty much gonna get rid of the truck now. It's become a problem no one can fix.

[@TWAMotorsports]

Could be a grounding issue

[@robadams2274]

@@TWAMotorsports probably, but how many ground wires are in the truck? I've already spent a fortune trying to get it fixed all for nothing. IMO, if someone encounters this issue, they should get rid of the truck immediately and save themselves from a world of headaches.

[@TWAMotorsports]

Several do get rid of them. Maybe 10 grounding places in all

[@robadams2274]

@@TWAMotorsports I've been reading online about it for months and haven't been able to get mine fixed at the shop. Is there a list of grounds I can fix? I will try it. I hate to see a nice truck get dumped over something this silly.

[@TWAMotorsports]

I showed a few of the ones I cleaned. Does it have a new gm throttle body?

[@igoo8787]

What is the size of the rims

[@TWAMotorsports]

18s

[@cesareduardorodriguez2539]

What about in 09 yukon denali

[@TWAMotorsports]

Pretty much the same

[@xBruceLee88x]

Been dealing with this with our 2003 yukon xl 1500 denali. Has the 6.0. Weird thing is when it happens, you can pull over and turn off the engine, then after a minute or so start up and keep driving normal

[@TWAMotorsports]

Yep throttle body or ground

[@xBruceLee88x]

@@TWAMotorsports yea definitely a repair I feel comfortable tackling... Not looking forward to the head gasket on my other car... 03 century with the 3.1

[@TWAMotorsports]

Yes the 3.1 sucks.

[@xBruceLee88x]

@@TWAMotorsports can definitely confirm lol. Replaced thermostat (that was missing for reasons... Previous owner), then waterpump was leaking. Then replaced that and then was told it was the intake Manifold gasket... Just paid for that to be done... And now it's the head gasket. Honestly not sure if worth it at this point... 238k miles.

[@TWAMotorsports]

Been there with vehicles before

[@cindygreen852]

2003 CHEVY AVALANCHE SAME PROBLEM ..after changing the TB the reduce engine power still there plus it start to misfire 2 last cylinders on the passenger side to front not firing

[@TWAMotorsports]

Definitely a ground issue

[@cindygreen852]

@@TWAMotorsports which ground ? where do i find it ,,i thought the injectors are the coils was the problem

[@TWAMotorsports]

Back of both heads

[@cindygreen852]

@@TWAMotorsports dont understand

[@TWAMotorsports]

There is a ground wire that commonly breaks on the back of each cylinder head

[@darthraider4083]

My dumbazz cleaned the throttle body without unplugging the battery now I have an idle surge and reduced engine power code so I bought a new throttle body/tps, I unplugged the battery for and hr and removed all the ecm fuses. It did nothing I still have a damn reduced engine code why do you think it wont clear the code? Quite frustrated I also disconnected - + and used my jumper cables to drain the system and still wont get rid of that damn code, any help would be appreciated.. I didnt touch anything else accept cleaning the throttle body thanks

[@TWAMotorsports]

Sounds like a ground issue to me.

[@darthraider4083]

@@TWAMotorsports Hard Codes: P025A U0073 Codes after I start the engine P1516 P2101 Truck was running just fine until I cleaned the throttle body wit 0 NO Codes.. Also why does my truck start up when I remove both fuse and relay to the fuel pump?

[@darthraider4083]

​@@TWAMotorsports Hard Codes U0073 & P025A, Truck was running fine until I cleaned the throttle body, my dumb ass cleaned and unplugged it without disconnecting the battery first no issues before the cleaning

[@TWAMotorsports]

Definitely a bad ground somewhere

[@darthraider4083]

@@TWAMotorsports Right on ill check around appreciate it

[@angelpppppp7017]

Throttle body sensor was change on my 07 Yukon buy still no power

[@TWAMotorsports]

Probably needs a completely new throttle body from GM

[@Texasmade4444444444]

Mine has been doing the same thing for years hardly drive it now i know what to do 😩

[@TWAMotorsports]

Change the throttle body

[@Texasmade4444444444]

@@TWAMotorsports ok i will i almost gave up on it even when its really cold and the truck is warmed up and i drive it itll do it again while im driving

[@jowensblack48]

Mine does it when it's hot out or after I wash it...

[@TWAMotorsports]

Probably not the throttle body then.

[@jowensblack48]

@@TWAMotorsports yeah it's pretty rare. If I shut it off and turn it back on a few times it usually goes away. I'm gonna try the ground back by the oil sending unit I already did the one on the core support. I'm also planning on replacing the battery to block ground I cut the end off of the one that's on there and It didn't do it for about 3 months. I think it's still a ground issue in my case

[@nbsaddiction1522]

Only throwing the p1516 code

[@fucken.joseee]

Roof rack delete with an Escalade rear window and pillars would look nice 👍🏼

[@TWAMotorsports]

I will probably do the roof rack. Don't like painted pillars though

[@Tonydevora--]

Those are ugly

[@TWAMotorsports]

Yeah I am not a fan of painted ones.

[@greenvelvetant3638]

What was the error code? Mine are P1220 and P1221.

[@TWAMotorsports]

Don't remember

[@cheetosd6396]

Mine started doing it when i want to floor it still cant figure it out

[@TWAMotorsports]

Bad ground I bet

[@williambeck3029]

OEM

[@TWAMotorsports]

Yep