GMC Yukon Denali: No Start, No Communications

In this video I have a look at a customers 2008 GMC Yukon Denali with the big 6.2 that has a stalling issue. The vehicle will run for a little while, then it quits and will no longer talk to the scan tool or start!
-Enjoy!
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.

[@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

[@deansapp4635]

As a retired mechanic, Eric ROCKS

[@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!!

[@leonardodavinci303]

"I'm not a strong network guy....." and then proceeds to give a Master class in network diagnosis!! Sweet.

[@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. 👍🙏

[@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!

[@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!

[@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!

[@mikemc7540]

Love to watch you work out issues with the electronics.

[@SouthMainAuto]

Wow thank you so much!

[@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?

[@ronaldbrosius7488]

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

[@mattbrown5511]

Tech and teacher.

[@dangleebols]

Pine Hollow would be proud of you Eric 👍

[@chadhelmer3835]

"Sorry to drag you guys through the mud here"....that's what we're here for Mr. O!!!

[@kevinmonseler3592]

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

[@demonknight7965]

I prefer Generic made Crap

[@pl5624]

General Mess o'Crap. Lol

[@MitzvosGolem1]

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 😂😂

[@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. 😎

[@marcstewart2328]

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

[@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 .

[@IntuCars]

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.

[@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.

[@crisprtalk6963]

Eric: I could be wrong. Me: I freaking doubt it.

[@mattmanyam]

Perfect.

[@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

[@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.

[@robv.o.1777]

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

[@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!

[@MDmathews]

I have watched mabey 10 of your videos. I'm a retired Ironworker. I did mostly industrial maintenance. I learned alot about many extremely large machines. As well as extremely small things. Furnaces, kilns, conveyors, crushers, ball mills, paper mills, etc. I've done shade tree mechanics my whole life. This video was a very good learning experience. I wish you were closer to me. I wouldn't have to worry about fixing, and screwing up my vehicles. You sir, are an excellent mechanic. Great video. Thanks. Your years of experience showes in everything you do!!.

[@iaov]

Great troubleshooting once again Eric. So enjoyable to watch. Thanks!!

[@johnlenoir1023]

Dang Skippy thank you so much for showing us and taking us through this lesson of learning I love

[@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.

[@lomo297]

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

[@jafo461]

You make it look easy. Thank you for the education.

[@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.

[@stephenerickson2514]

Thank you, fabulous troubleshooting diagnostic with clear way to follow how you determined buss

[@timgruver5932]

You never cease to amaze me with your expertise. Years of school of hard knocks.

[@malibuStroker]

Excellent video! Love watching your process and thinking it through out loud.

[@jamespearce7954]

Love your methodic approach. Works evey time. Great work 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.

[@GetReal3327]

Nice going Eric, I like the way you think and telling it as it is, lessons learned. Thanks

[@wanderingweederspapa7878]

Nothing beats education, thanks for sharing the thought process

[@mrkttrdr2919]

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

[@JBreeze4598]

Excellent VIDEO! It was educational. Thank you for taking the time to walk and talk us thru the process.

[@jkel2080]

Thanks for the drag through the mud. I learn best when I’m dirty anyway.

[@richardthomas1743]

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

[@jswope6007]

Thank you for the teaching today. great video

[@craiggoodwin9704]

Eric, always learn a little more watching your video's. Thanks for Sharing!

[@davidmcclain5180]

Absolutely loved it. Nice job Eric and we all probably learned something.

[@billkaczynski7709]

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

[@josecondemarin9586]

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

[@michaelskinner896]

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

[@cordellbennett]

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

[@ChrisWilliams-pu8pj]

Thanks for the additional details on your thought process. Greatly appreciated!

[@JohnnieBravo1]

Awesome troubleshooting. Ivan would be proud!

[@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 :)

[@mikeboeggeman8438]

Love these “thought process “ videos…..

[@philmerrifield1163]

Happy Saturday all, great video as always Mr O hope you and the family are well and thanks for all the content keep it up

[@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 .

[@chrisforker7487]

Love these electrical videos, since they are my weakness. Learn great things on all these videos. Thank you!

[@dosiodosev740]

Improvisation is definitely sight of mastery, thanks

[@victorbellan8357]

I hope I never have to chase a problem like that, but you made it logical to follow , thanks!

[@petertom829]

Excellent thought process and diagnosis Dr. O, Love the way you think, Please keep the vids coming

[@Firemanbillco2]

Dude I want to thank you for taking your time to this video. I’m just getting into the can bus wiring diagnostics and it can be overwhelming at times.

[@tallpaulsynd]

You techniques are great!

[@MichaelJordan-jv6ic]

I appreciate the insight into how the canbus system works. This was very educational.

[@williamhanna5224]

Great work

[@rodrv6]

I really enjoy watching your videos! I do all of my own car work, and I have one of the Autels. I've learned a lot from you!

[@Dave-fp9jh]

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

[@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

[@donkaiser6704]

Great video. Don't sell yourself short regarding your ability to diagnose network problems, your logic and process look to be spot-on.

[@ronaldbrosius7488]

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

[@schwinn434]

Thanks Eric- very informative, as usual.

[@eriksbelte4119]

Greetings from Latvia! Great videos you have here. I've been watching them for some time now and greatly enjoy these kind of diagnostic videos. Easy to follow, understand and just perfectly explained! Keep up the great work!

[@liamdabull1344]

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

[@yhird]

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

[@noelcastle3986]

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

[@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.

[@roddyrod4922]

Love videos where you chase wires

[@joejohnson7097]

I enjoy watching you do the troubleshooting. You petty well explain flow chart for system thanks for the videos

[@PaulCTownsend]

Very good thought process Good job.

[@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.

[@schwinn434]

Thanks Eric - I learned a lot (especially, the tip of just using the flame of a mini torch to solder)!

[@grabovg]

Great video Eric I love it. I love the process. I love the result. The one thing I don’t love is rust and I’m glad I don’t have to deal with it anymore.

[@dean9498]

Perfect demonstration why you're the king of troubleshooting. 😃

[@billhennie]

Thank you for the valuable education. Much appreciated.

[@dailydriver8280]

I'm sure any dealership techs that watch your channel dropped off long ago as they didn't have any idea what you were doing. Their idea of tracking down an issue is ordering up parts to replace every module under the Yukon in their quest to repair it. Another great video, Mr. O. Your town is lucky to have you.

[@scrappy7571]

You got it all wrong..dealer techs load up the estimate to make you go away. Hopefully the parts needed are discontinued, that seals the deal. On to the next highly profitable wallet flushes.

[@effenfish661]

logical and practical progression.

[@digitalwoodshop]

Excellent episode. Learned a few things. Logical Troubleshooting...

[@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...

[@albertorozco5981]

Absolutely impressive diagnosis 💯 and repair as always.

[@daviddamico4288]

Great job Eric, you are a great technician ….

[@Martin_from_SC]

Very cool diagnostic, Mr. O!

[@wingman8447]

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

[@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.

[@jgeorges3061]

ERIC, you rock brother always learn something from your video and humbly thankyou for that great diagnosis as always cheeeers from CANADA.

[@paulbagley6198]

Nice job. Always interesting and informative. Thanks.

[@Chico-td2fy]

Thanks for all the great sharing of knowledge!

[@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.

[@shaneharrison4775]

Excellent process and well done

[@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.

[@goodcitizen64]

So, very much above my skill level, electrical and new electronics always ate my lunch! Great video, brother!

[@baysideautorepair8616]

Great video. Great Diag. Thank you Eric!

[@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.