GMC Yukon Denali: No Start, No Communications

[@GTCGreg]

Eric knew what the problem was before he even started filming the video but went through the entire process just for our benefit. Great educational video and thank you for taking the time to show how it's done.

[@skinlab4239]

It makes a video which he makes money on.

[@andystark8434]

Unlike a lot of mechanics u did it right for situation and didn't up sell or screw customer. Top quality mechanic and person. Thanks for doing what u do!

[@GTCGreg]

@@skinlab4239 Nothing wrong with that.

[@sumduma55]

@Skin Lab could be worse. He could make a 3 part mini series out if it and use keywords like crazy, wild, and unbelievable while describing the symptoms.

[@sir_frag1868]

I agree 100

[@francisgagnonAE86]

The best video of the year for me ! . I do trouble shoothing for 15 years on hvac system and i alway say you need to find what’s not the problem to find it when it’s to hard to find .

[@deansapp4635]

As a retired mechanic, Eric ROCKS

[@bwalker4194]

You’ve never heard of SMA or Eric and you’re traveling home from the scenic Finger Lake Region. Your car mysteriously shuts off while driving. The tow truck driver says he knows a guy in nearby Avoca. You’ve just won one of life’s great lotteries!

[@redmondjp]

This is extremely useful - I would say that most mechanics today don't understand what you did today and would just throw parts at it until the customer's wallet is empty. So yes, this is a valuable video for anyone who wants to properly troubleshoot and diagnose the issue. CAN bus issues like this, especially when they prevent the vehicle from being scanned, can be extremely frustrating for those who don't know how to operate without a trouble code to start them off with. Thank you for taking the time to explain everything in detail!

[@rick980]

That is what dealers do

[@kens.3729]

@@rick980 For Obscene Hourly Rates! 🤪👎

[@Discretesignals]

Most mechanics? Have you been to every shop in the nation to come to that conclusion? There are extremely smart and honest mechanics out there that can solve the same issue just as efficiently as Eric, but you won't see them on KZbin. Nice how you lump every mechanic as stupid and ignorant because you'd have a bad experience with a couple.

[@HueToobBlows]

Many mechanics don't understand simple diagnostics. I deal with it all the time with my customers as they like to diagnose things that turn out to be incredibly wrong.

[@kens.3729]

@Richard Cranium Right On, Richard. 👍🙏

[@NikMitchell]

dude - this is EXACTLY the kind of content I'm looking for when I watch your stuff. Huge fan of walking down the line of the troubleshoot with you - and when I'm completing your sentences, I know I'm learning something. FANTASTIC learning opportunity. Thank you, as always, sir. :)

[@SouthMainAuto]

Awesome, thank you!

[@doyleb765]

Totally agree; this is the stuff I watch for. He says he's not good at network, but his thought process gets him through it every time. Thanks Eric!

[@gwrider2146]

SAME! This repair video is my favorite one to date in recent memory.

[@jfarley777]

Yep, I usually join in with "...Lady" to finish "There's your problem...." -- Seriously, this is gold Eric - Thanks!

[@tim656]

@@jfarley777 was doing pads and rotors this weekend. You know you watch too much Eric when you catch yourself saying “the classic reach-around” under your breath while feeling for a bolt!

[@mikemc7540]

Love to watch you work out issues with the electronics.

[@SouthMainAuto]

Wow thank you so much!

[@kevinmollet5364]

Excellent episode. I always appreciate the time Eric takes to explain his thought process when solving unknown issues. It let's me walk away having learned a little more. Keep up the great work!

[@MrBill42mb]

Thank you so much for posting this video. The faulty suspension control module was exactly what was wrong with my wife's truck. I appreciate the thorough explanation!

[@ronaldbrosius7488]

Your not dragging us through the mud! We love the troubleshooting! Amazing job as always! Your a excellent tech!!!

[@mattbrown5511]

Tech and teacher.

[@kevinmonseler3592]

GMC......Greatest Mechanic Coming.........and here he is!

[@demonknight7965]

I prefer Generic made Crap

[@pl5624]

General Mess o'Crap. Lol

[@Nudnik1]

I have 285k and 380k on my GMC /Chevy not much issues . Fuel pumps wheel bearing hubs starter alternator . Cheap easy to fix . I only own GM .

[@kevinmonseler3592]

@demonknight7965 my favorite is Chevrolet....Can Hear Every Valve Roll Over Late Every Time 😂😂

[@dangleebols]

Pine Hollow would be proud of you Eric 👍

[@frigginFin]

My line of work for 33 years has been in building automation control systems with all sorts of buses and controllers. I can honestly say your method of diagnosing a bus problem is spot on. Measure. Split the bus in half and see what happens and go on from there. Excellent video. 😎

[@jinksonyou]

Useful???? Are you serious? Lol you are the first person/channel I go for DYI kinda stuff and beyond that even! You explain everything to a t and will go as far as looking it up! As usual another absolute GEM of a video, keep'm coming Bro n I'll be sitting right for your newest video to pop up WoooHoooo! Cheers from Canada Bro

[@marcstewart2328]

Love these electrical videos! Just your methodology to finding electrical issues is amazing to watch. You are the car whisperer.

[@CycleGeezer-cq9lm]

Many, many years ago when I was training on electronics and radio repair in the US Air Force we were taught the "split the system" method of troubleshooting. Inject a signal at the halfway point and get the expected output result....you know your problem is in the first half. Split the first half and inject signal again. So on and so on. When you lose your expected output result you have significantly reduced the possible areas where the defect can be. Then you can get down to checking at the component level to isolate the trouble. Watching Eric go through and eliminate modules by doing systematic splitting up of the systems reminded me of the good old days in the Air Force. Good times! I hope Eric's customers appreciate what a top notch technician/mechanic they have. They are lucky he is in their little town!!

[@Stevme0001]

I never miss one of your videos. They're really good. But this one was better than most. Really really enjoyed this one. The diagnostic ones for me are the best ones.

[@mgunning7362]

There are two 120ohm end of line resistors. One at each end of the bus. When your bus is complete the two resistors are effectively connected in parallel, so the total resistance drops to 60 ohms.

[@bcad4066]

I'll bet he confused a lot of people when he said, "120+120 is 60."

[@tomtheplummer7322]

...make a “jumper” to insert and terminate or bypass the buss or module. Trust me. I’m a mechanic and and engineer...😏👌🏻👍🏻😉🤓🤔🤨🧐😎

[@DavidRa73]

@@bcad4066 Yep. I was wondering for a moment what kind of wonky series circuit (

[@jamespfitz]

THANK YOU! I felt so dumb.

[@icepick859]

Hmm isn't that exactly what he just said in the video one minute in?

[@lomo297]

Love the detailed troubleshooting ! keep it up. Beautiful family. I am 80 and still need to exercise my mind. You help.

[@robv.o.1777]

Eric O can tape a mean present 😊 Great diagnostic strategy 👍

[@benjaminrj872]

I just wanna say, your skill and knowledge is another level. I am a heavy equipment mechanic myself. But yet your videos teach everyone techniques to perfect their craft , what I’ve seen your diagnose actually saved me when my service truck broke down today . Cheers ! Keep it up -Ben , Canada

[@correctednews1463]

This guy is a wizard!

[@adamtrombino106]

Good ol Uncle BOB makes this job a lot easier for verification. I love these types of vids because data network issues are my weak(er) skill, so picking up tips beyond the visual inspection is always welcomed!

[@SouthMainAuto]

Glad to help

[@billturner1240]

Man.... you Sir are a great teacher....

[@mikecee3058]

It's hard to believe that a vehicle that new is that rotted out. Once again I'm glad that I live in the south-down here there are a lot of examples of that age that look new underneath.

[@fritzkabeano1969]

Pure reasoning and common sense on display. Thank you. Inspiring.

[@RyanHull76]

GM Electronics and mechanical engineers: Keeping mechanics employed and putting their kids through college since the dawn of time. Thanks!!!

[@lexteakmialoki5544]

Hey folks, I knew whats wrong with this car before I even touched it, but for the sake of a video, lets pretend I don't🤣🤣 "If I can do it, you can do it, but it's going to take significantly longer" Eric, you are the best and make it look so easy, glad your sharing your knowledge.

[@jonknocks111]

Old software programmer here likes your binary search approach. Keep breaking it in half until you find the element you need.

[@SteelheadTed]

I had already caught up on all my favorite KZbin channels and thought dang, I might have to be productive today. And then, EricO saves me!

[@paulglad5615]

Son bought a 2011 youkan danali and shortly after the purchase it showed the symptoms just like in your video. It was suspension module and your video helped walk through the diagnosis. I complement you on your ability to explain your process when diagnosing any issue and thank your sharing your knowledge.

[@SouthMainAuto]

Thank you!

[@mouselt1]

What I find absolutely hilarious is you say you're not really strong on diagnosing these issues. You're 99% ahead of every other tech I've ever seen dealing with these issues. Keep up the good work!!

[@gzzzr1]

Your use of electrical tape, butt connectors and heat shrink are TOP NOTCH.

[@MikePickett-qt7jw]

People in your area is lucky to have someone like you that can trouble shoot cars like you, I have a problem in my ruck that only shows up when it is cold and then when it warms up in the cab it goes away. There is noboby around here smart enough to find it. I wish I could drive up and let you fix this. Great work Dude..

[@jasonkennerly1744]

I have this exact same problem with a 2011 xl Denali. Had I found this video two days ago it would’ve saved me $350 to have the can jumped at the suspension module. This video is quite useful. You should list the cluster bouncing in the description and you’ll see lots of clicks!

[@petermartinez5573]

Hey don't short change yourself, great diagnosis and elimination of modules. My man Ivan over at Pine Hollow would be right proud of you :)

[@TimfromAlabama]

Absolutely amazing. I would have been so lost figuring it out I'd probably just junk it anyway. Proof that the more bells and whistles you add the more crap you throw into the mix to mess up. OH, for the days of simple wiring and manual control systems like my dad had in his 72 Dodge 100. I think total there wasn't more than 20 yards of wiring in the entire system which was to 3 simple dash lights and mechanical gauges for oil and temp. Nothing but an AM radio with 1 speaker in the dash at the windshield. 1 coil, distributor, points and condenser...and I thought that was complicated...lol. You are a master of mechanics. And I enjoy watching your vids. Take care.

[@jerryburdick8051]

This was particularly fun since I had an '07 XL version of this vehicle, down to the colors. Your troubleshooting skills never cease to amaze me. Thanks so much for bringing me along on this one.

[@wanderingweederspapa7878]

Nothing beats education, thanks for sharing the thought process

[@davidcornell9090]

I love how you show what's wrong and how to diagnosed the problem and fixed it...even though you already kinda knew what was wrong... very educational on how it works... love your videos, keep them coming...

[@Gary_in_NoVA]

Very impressive diagnostics and thought process. I learned a lot here today. “. . . If I can do it, you can do it.” Yeah, I don’t think so.

[@fredwalker839]

It’s elementary my dear Watson! Love it, like closing a bus stop, hook the light bulb wires together & the bus still goes by ! LOL👍

[@nicholasfrediani9466]

Eric, as a mechanic I find it so so incredibly satisfying when you catch intermittent problems on a scope and on camera. I know how difficult that is or can be. Thank you for all the great information you put out for the world.

[@dtandfam8100]

Love it! Really no parts needed! I might have to disagree with you on "you not being a network guy" quite the opposite in my opinion. Thanks for sharing 👍

[@timothycooney986]

How fortunate we are to have an incredibly skilled and knowledgeable mechanic allow us to follow his methodical approach to troubleshooting a network problem. Thanks.

[@davewagner5408]

I learned something today,thank you. This is the future of repair, so we better learn it. You,Pine Hollow and Scanner Danner are indispensable. Thanks to all of you.

[@mod_incllc3235]

Reviewing this again because it is the best video out there getting into the network and how they all interact with each other. This stuff has started popping up beyond the rust belt now and this video can help every level tech understand what is going on in an otherwise potentially tricky system if you are not familiar with it. Keep this one handy guys.. and thanks Eric for the hard work that went inti this. It's a real eye opener.

[@scottnusser6232]

Great video as usual. You're a very humble teacher! Always learn something from you. Soldering those wires and taping the connector that well in tight space is art. That is inhereted skill cannot be easily learned.

[@tedjohn441]

While I was watching you break everything down I thought this guy should be a detective. Great job as always and I always learn something new when I watch you work.

[@daviddamico4288]

Great job Eric, you are a great technician ….

[@RoadSgt]

Eric I love your vids. I am a Planes, Trains and Automobiles guy, Ive had to troubleshoot them all. I taught electronics troubleshooting on multiple Air Force jets and then moved over to super sophisticated light rail trains (funny). I was the emergency call guy for a particular Volvo shop when things went beyond thunder-dome. No matter the problem I was always sweating bullets when someone was pressuring, me; you definitely have the right mindset for what your doing. I suspect you enjoy the challenge of solving problems - be they mechanical or electrical. As a shop I'm sure you don't have the luxury of time to put 110% into every job, but I've been watching your vids for well over a year now and I'm going with 109.9% of honest integrity and skill. I'd give you a raise if Mrs. O would authorize it. Thank you bud, and as we say in the Air Force... don't Aim High, Aim at the *#&@!ing Target. Cheers!

[@cordellbennett]

Love these electrical diagnostic videos. Always interesting to see how one or two little wires brings the whole rig down.

[@clonetrooper576]

Gotta love watching a real mechanic actually figure out a problem. I know someone who loves diagnostic work, he's a tech at Mercedes so he stays busy!

[@jeffphillips7290]

I’ve been doing mechanic work on cars for the better part of 35 years now. Every time I watch one of Erics videos I realize just how much I don’t know bout these modern vehicles. Thanks for taking the time to really explain these electrical issues in depth .

[@reason2gether]

Hey Eric , thanks for the warning at 30-minute mark. I had just enough time to put my safety glasses on! You may have to re-define "simple" after this video (referring to network modules and their increased number). Great job as usual Eric! I know of no better Master Class Technician that can do the job and keep the viewers so close to the action at the same time. You are truly gifted by God, that is for sure. Thank you once again, and God Bless you and yours my friend.

[@liamdabull1344]

I hope this helps me I thank people like you who help other mechanics like me tryna figure it out

[@Saaketti]

This is why I do have 120 5% resistors in my toolbox. They are handy to simplify the can bus and in the way isolate possible cause away from the network.

[@lucidbarrier]

Drag us through the mud with the diagnosis. This was really the way it is with finding weird problems. I got lost for a minute when you started talking about red herrings and you were jumping the wire harness under the dash but then I understood immediately when you bypassed it. When you went underneath and unplugged the module ahead of the other two modules it all made sense. You kept showing us how it was broken or how it was working and it's really logical. That was a really great video.

[@alanragsdale9220]

I'll be dipped " Sounds like the V.G.G. Guy. Both of You are Great to watch!!

[@SteelheadTed]

That is Eric’s nod to VGG

[@christopherweise438]

@@SteelheadTed - Yep. He's done that many times with different "Derekisms"

[@Todd66]

I love this channel. I did not however love the whispering in my ear nonsense….trying to creep me out or something….jeez.😂 Another crazy impressive diag that I am happy to watch. E has such a good sense of humor.

[@BearsTrains]

Hi Eric. This is exactly why I watch your channel, the logical diagnostic method you use is brilliant. (that, and the occasional appearance of Mrs O) The videos almost becomes a murder mystery. I find myself taking guesses along the way (nearly always wrong though)

[@bradburkhalter4082]

Eric, I don’t really see a weakness in your diagnostic skills brother. What you do is very thorough and it takes you to the problem. I personally think your diagnostician skills are marvelous. You sir are a mechanical magician. Continued success on here and may God continue blessing you and your wonderful family.

[@privateer0561]

I always wanted the "Denial version" of the GMC Denali.

[@reason2gether]

Are those sold in Egypt?! I learn a lot of cute names for vehicle models from this channel too!

[@kenj.8897]

For an old guy he's pretty sharp lol . Such a good Mechanic .

[@douglash3129]

Hi Eric and the lovely Mrs. O. Why do you keep saying lucky guess? You did this whole video for us and I think we know that you don't guess about anything you're working on!! That's another reason all the shops bring their problems to you. This is an outstanding piece Eric, be proud!!! and Thanks alot Eric, good Man!!

[@mattbrown5511]

Just a little tip to really annoy your "Safety Sally" viewers, but you can buy electricians rubber sealing tape to keep debris and water out of connections. It stretches and bonds to itself and the part you are protecting. It works wonderfully well. I see nothing wrong with what you did as long as the customer is in the know. Thank you for running us through the process of diagnosing this problem.

[@billkaczynski7709]

I love watching your videos because even at 76 I am still learning. Thanks again Eric

[@RICHFO100]

They make them trucks and they don't last forever have so much problems with them you take it to the dealership and they can't fix it you need this and that thousands of dollars money is all they want keep up the great work you do better than the dealership 😉😉

[@bigchevy350boy]

You nailed that on the head. Sadly this is why people are trading in more often or going the leasing route.

[@deanfischer3402]

WOOOOSH right over my head. Who the heck knows this stuff you just figured out???

[@ricka5471]

Thanks for the video. It is great to see your method on trouble shooting. That method works on other processes out side of the auto world too.

[@mikeboeggeman8438]

Love these “thought process “ videos…..

[@GNXClone]

That was a great diag session. I learned a lot. One thing I would have done differently is I would’ve salvaged the connector from the bad module and made the loop through that. That way you wouldn’t have to cut the harness and it would be keep the seal to protect the connection from weather.

[@mailmanjoe]

I see a 49 minute video on a CHEVROLET! With a com issue by South main auto, I click. Because I know it's going to be entertaining. 🤣

[@timwoodring7346]

Great educational video!! I’m a mechanic and wiring/module failure is not my strong suit. I love watching how you diag and the process you take.. super helpful thank you for all the great explanations of everything you are doing!

[@OtherSarah2]

Computer networking as car repair. Outfreakingstanding, sir!

[@michaelskinner896]

Yes, this was useful! Thanks for the reasoning, rational, and diagnosis.

[@bigchuckynab]

Hands Down, Eric is the best automotive teacher on the Tube!

[@roddyrod4922]

Love videos where you chase wires

[@jamesguralski5156]

1 of the best channels! Eric should 8,000,000 subscribers!

[@B_D_R]

Gotta love this kind of diagnostics. At work we deal with J1939 CAN network issues all the time. Loggers and GPS systems that are integrated into trucks also can cause CAN codes and issues. Great video!

[@philgriswold2133]

Some of the most useful trouble-shooting advice I ever got as a young man was when a retired Navy Master Chief explained the Isolate and Eliminate Theory to me. Never fails.

[@noelcastle3986]

Another great training video broken down to common sense diagnostic procedures thanks Eric.

[@markcaldwell1245]

I love it that you are dragging us through the mud. These are the times when we get the best information. Excellent video thank you.

[@m600blu]

I’m impressed with your ability to work on databus. I’ve tested and repaired the databus networks on literally hundreds of aircraft for Boing helicopters including Ch-47 Chinooks, and the V-22 osprey and usually if a whole network is down the problem is usually at one end or the other. I’m at 24:00 in and I’m looking forward to seeing how you do.

[@JohnG-is7eg]

Nice. You make it look easy which it is not

[@suttoncoldfield9318]

'Boing' helicopters, that be a great advertising slogan.

[@ronaldbrosius7488]

These type of video are by far the best! Most people only show brake jobs, or wheel bearings.

[@johndesaavedra1040]

Great idea. Place a metal-cased control module at the rear underside. GM engineering at its finest. A couple of Scotch locks from success.

[@idahospud6979]

I get a kick out of you" worrying" about feedback from fans! even when you explain in such fine detail! THANK YOU for sharing your experiences....

[@crashoverride328]

Fun fact - resistors are typically rated between 5% accuracy and 10% - so between 6 and 12 ohms on 120 ohm resistors, so 110 ohms is within spec for a resistor showing 10% tolerance.

[@christopherweise438]

"The More You Know" Thanks.

[@Myodots]

This could be true for some resistors in special/specific applications, but it is certainly not true for the vast majority of resistors.

[@crashoverride328]

@Freiherr Dinkelacker To be fair he could be referring to SMD resistor (carbon film resistor) which has 4 levels, namely F level, ±1%; G level, ±2%; J level, ±5%; K level, ±10%, however when we look at the application which is network bus termination using UTP wiring there would be no need to go below 10% as every connection along the path of the bus will marginally affect circuit resistance and too precise a requirement would result in unnecessary network termination faults. The resistors are most likely at 5% to 10% tolerance (also in the interest of cost) with an overall circuit tolerance of 15-20%

[@Monkeh616]

@Freiherr Dinkelacker Know-it-all people still focused on leaded resistors in 2023?

[@stuart1030]

Resistance is futile.

[@lucasthibodaux8064]

I just starting having this exact issue on my 8 suburban I remembered this video and went straight to the suspension module and bam it’s fixed. Thanks Eric O

[@wingman8447]

Great troubleshooting techniques. Solid stuff. Thank you for a very instructional video

[@richardthomas1743]

Goooooooooooood morning Eric ! I hope that all is good for everybody today! Enjoy your weekend!

[@Dave-fp9jh]

This is one of your best trouble shooting videos. Keep up the great content.

[@michaelweatherhead9470]

Thanks for the video Eric O great job on the GMC duct tape and bailing wire for the win. Nicely done 👍✅. Take care of yourself and family and be Blessed ❤️❤️ it.

[@dreamscapes3257]

Love your videos. You could be a great teacher I have learned more from you in just watching your videos than I learned in 3 years of vocational school when I was in high school

[@mrkttrdr2919]

thanks for bringing us along on the chase, ur process and explanation is always a great learning experience, thanks for posting🙂

[@DEW409]

Thanks for showing the entire diagnostic process for your viewer’s benefit I know damn well you had a strong suspicion of what the problem was all along from past experience, and if you had checked the suspension module first, as your experience taught you, you could have fixed the truck in five minutes. That’s what I do. If my first hunch is right, I just saved a bunch of time. If my first hunch is wrong, then I go for the step by step diagnosis and the moment or two I wasted looking for a pattern failure is insignificant.

[@josecondemarin9586]

As usual, Eric, a very good training session. Great video. Take care, thanks 😊

[@ducati543]

This just brought me back to my Red-Green days. 😁

[@yhird]

Eric, your networking diagnostic knowledge is top notch. Thank you for sharing another great video. Cheers.

[@The_Redkween]

I’m an Industrial Equipment maintenance technician. I try to explain to the newbs, all the time, how useful Occam’s Razor is in troubleshooting. This was a great case-study in that.

[@antisocialjusticewarrior2073]

I'm having a similar problem with my 04 2500hd disconnected my abs module, boom guages, dash & windows worked when they weren't. It was still running but not too good though. These electrical issues are frustrating to say the least...