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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Disclaimer:
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

[@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.

[@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!

[@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!

[@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!

[@mikemc7540]

Love to watch you work out issues with the electronics.

[@SouthMainAuto]

Wow thank you so much!

[@ronaldbrosius7488]

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

[@mattbrown5511]

Tech and teacher.

[@MrAlan0151]

You worry too much about what people say, everybody's an expert sitting at home, well done Eric.

[@chadhelmer3835]

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

[@dangleebols]

Pine Hollow would be proud of you Eric 👍

[@crisprtalk6963]

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

[@mattmanyam]

Perfect.

[@marcstewart2328]

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

[@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. 🤣

[@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. 😎

[@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.

[@seanramirez488]

I know that people absolutely hate Common Core Math. But it teaches you Eric's thought process. It's not about the math. It's about the problem solving process.

[@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.

[@ConesuelaLadyTailor]

I can confirm that wrapping the connector in insulating tape is the recommended repair procedure as described in the OEM GMC repair manual page 1165. 👍

[@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!!

[@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?

[@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!!.

[@OtherSarah2]

Computer networking as car repair. Outfreakingstanding, sir!

[@thomaswilson8634]

I have a 1992 chevy 1500 4x4 with 300k on it. The dash is coming apart in places but other than that it's a great truck. No rust. I have a 2018 ram 1500 2 door 4x4 ordered with everything the factory would put on it. It's as clean an pristine as the day it was made. Both Georgia trucks. I could never live where my vehicle investment will rust away

[@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 .

[@user-ut6ji8my2h]

It absolutely amazes me how Eric refuses to be beaten by the crappy engineering that goes into todays vehicles. Back in my day, there were no " Giant Green Puss Sacks" below and under the vehicle to go bad. The word quit is not in Erics kit bag. I hope some day he can build a drill down software app for the less talented, which includes about 99.9% of us. Of course, at 77, ill be back to carbon by the time he retires.

[@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

[@RyanHull76]

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

[@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!

[@robv.o.1777]

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

[@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.

[@lomo297]

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

[@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...

[@irish6976]

Eric’s on it! Problem you better hide, or surrender!!!!😂

[@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.

[@oldroscoe2590]

My goodness, all those modules to make life better.

[@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.

[@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!

[@correctednews1463]

This guy is a wizard!

[@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..

[@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!

[@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

[@AntonioClaudioMichael]

Good diag process Eric O suspension module is toast @South Main Auto Repair LLC

[@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 :)

[@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 .

[@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.

[@ghost37666]

Your electric tape wrapping skills are on bar with doctor's bandage wrapping skills, you're like a surgeon with that thing.

[@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

[@jonknocks111]

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

[@kittty2005]

I was a certified mechanic in Michigan back when it mattered, for 25 years and I would have done it just like you, except I didn't have to Richard around with electronics the first 20 years. My brother worked for Michigan Bell, then Ameritech for a total of 35 years, and he had quite a collection of nitto tape, he had all sorts of ways to modify it's size, plus he gifted me a small roll of 16 gauge stainless suspension wire, 40 years ago best make shift hanger wire around for anything. If the body mounts rusted away just loop 3 strands around and twist the wire together and it'll work 35 mph for a couple years, my bother had more guts or just ptsd, it made good muffler hanger for the life of the car or truck.

[@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.

[@keithlibner9259]

I love when the hot plastic melts to your finger, interesting looking blister.

[@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.

[@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.

[@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.

[@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.

[@ducati543]

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

[@gzzzr1]

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

[@fritzkabeano1969]

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

[@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

[@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.

[@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.

[@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.

[@andrewg6238]

Mr. O. You say you use common sense and logic to troubleshoot problems. That is SO not Politically Correct these days. I SO applaud you and your ability to trace actual problems. And being Politically INcorrect. 🤣🤣 Keep up the great work and most of all taking care of your customers vs. line your pockets 'til they overflow. You and Mrs. O. be Blessed and keep us smiling! And remember viewers...If Eric can do it, pay him to do it and watch the video later!!

[@tomtheplummer7322]

I used to work in the computer and robotics industry. Many of of those machines used CAN bus and CAN bus 2. It was “cheaper and readily adapted” to those applications because CAN bus is a standardized technology. Yes, we also had problems with a single module (we referred to them as “nodes”) would keep the entire machine down and diagnostic tools couldn’t communicate. We would disconnect nodes (modules) one at a time until at the communication could be established. Then plug in all but the last node we disconnected. Often we would just replace the failed node if everything else came back up. Sometimes it wasn’t a failed node, but an issue with the bus cables and disconnecting all but one node, the machine wouldn’t communicate. Now the fun begins. Getting out the meters and O-scopes and using your eyes to look for possible damaged cabling. 🤷‍♂️🤔🧐🤨🤓👍🏻👌🏻😉

[@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.

[@charlestredway8253]

You just answered the problem…. ON STAR!!!!

[@ronaldbrosius7488]

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

[@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👍

[@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.

[@wanderingweederspapa7878]

Nothing beats education, thanks for sharing the thought process

[@AntonioClaudioMichael]

Nice catch on camera Eric O with can high and dead then working then shorting @South Main Auto Repair LLC

[@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.

[@roddyrod4922]

Love videos where you chase wires

[@95thousandroses]

I knew what the problem was even before I opened the video

[@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.

[@Tevildo]

A nerd point - you're right in saying that 109.7 isn't a valid FM frequency. Commercial FM radio stops at 108 MHz, aviation audio communications start at 118. 108 to 118 is reserved for VOR navigation and the like, which today is largely obsolete.

[@iaov]

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

[@liamdabull1344]

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

[@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.

[@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.

[@tylerh8230]

Thanks again for fixing my rusty pile of crap lol. Wouldn’t have figured that one out on my own. Still running good no codes.

[@schwinn434]

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

[@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.

[@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)

[@jamespearce7954]

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

[@cordellbennett]

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

[@johnreid859]

What I liked about this video was I knew what should happen in a low tech diagnosis of the network. I’ve watched Eric solve this problem without Ivan’s technology. Eric’s diagnosis worked. 👍

[@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.

[@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 👍

[@abornbuyer]

I have a 2005 Yukon XL Denali that won't turn over and it has been to three different mechanics. I sent this video to the mechanic who is working on it now. I'm hoping that this video might help him go in the right direction! Thank you so very much!!!

[@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.

[@windward2818]

If you look at the data sheet for a classic HS CAN interface IC like the TJA1050, which is a standard part, and something similar must be used for each HS CAN node in order to meet EMC, so each CAN module (Node), will have a similar HS CAN interface IC. So, all the modules on the HS CAN bus will behave similarly. One feature of these older common HS CAN interface ICs is they are not supposed to take down the bus if the module in which they reside is powered down while the remaining modules on the bus are powered and active. So, one option for troubleshooting, if you want to keep the termination intact (which is necessary for the bus to operate), is to power down each module in-turn and see if the bus recovers. If a powered down module removes the fault, then it is most likely a module issue (could be the module CAN driver IC, uC or power supply). If, after doing the power down test, the bus does not recover it is most likely a harness or connector issue. Eric's shop is in rust belt central, so I would be tempted to just do a through visual inspection once the faulty network is identified to see if there obvious signs of harness failure, chaffing or connector corrosion.

[@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!

[@jeremyneufeld6541]

"Remember folks, if I can do it, you . . . . oh, never mind."

[@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.

[@billkaczynski7709]

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

[@stephenerickson2514]

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