When I grow up I want to be like Keith. Absolutely amazing Keith!!

Keith, I know you know this. You are so appreciated. Really enjoy watching your videos. Better than anything on cable tv. Bless you and your family. Have a good night.

Watching you fix these network problems always makes my weekend Kieth!

Oh, dang. A Chevy Traverse. Dump that crap fast. My brother-in-law has a friend that use to work on those all day long at a Chevy dealer. He was low man for 2-3 years and so they stuck him with all the "fun" jobs. He can't even remember how many transmissions on less than 3 year old Traverses he replaced. He quit that job and is now working for a heavy equipment place and is much happier. He's dang good at Cummins engine work as well.

Huge pleasure to watch you work!

If there was a electrical diagnostics hall of fame you would absolutely be in it

Outstanding vid Keith - love watching the comm issue diagnosing.

Just spent 12 hrs on a Cadillac getting nowhere, you just have given me the correct starting place. Thanks

Sir, our 2015 is at the dealer currently with the exact symptoms as in the video. The dealer has called me twice today, and asked what I saw and did...Service writer stated they dont have communication with the ECU and are calling GM for advice...Tire air system low light indicator on, Air bag Service light on, key fog doesnt work, dash lights out, no volts shown on the gauge, when turning the key to on/start... Thank you for being a true professional in the industry!!

Very good information Keith, made it looks so simple. You're good but your son will be better. God bless you both.

I really enjoyed that, Keith. You are one smart man.

Real fine system automakers have created. And everyone wonders why I love cars built before 1996 ... This was GREAT, Keith! Learned alot on this one. It really isn't as complicated as my mind makes it out to be, once you isolate and test each leg like you did. Of course, the right tools make all the difference too - I'm still working on that part of it. 😊 LOVED the vid - THANK YOU!👍

I dont have those problems with my 78 3/4 ton chevy...lol...a true pleasure 2 watch you work..thank you. I hate new cars,how silly is that to keep your car from starting . Just another way to get in your wallet..

Very interesting Keith and as always you make it look easy peasy.

Just ran into this today I was dumb founded and was about to send it to the dealership. I used this as a reference point following your step with a multimeter and found the climate control also was the issue. No start,no communication,no radio,no hvac,no gauges working intermittently, and inop key fob. Thanks for the info sure was a lot of help.

This was amazing Keith. Thank you so much for taking your time to share this case study with us. Cheers

I love videos like this. You are excellent at what you do. A friend of mine called me on an 08 Acadia that I cant communicate with the engine ecm or hatch module. Has loss of communication codes stored. I bought a pico scope and want to use it. You have had multiple videos using that GM low CAN plug with the jumper connector. I think that is super useful to know to "separate" the circuits and narrow down a problem. I understand why your stuff is quick and to the point but man it would be awesome to learn it all. Then again i know experience is key. I work on heavy construction equipment and not automotive so seeing you and select others on KZfaq helps a lot.

excellent diag keith and thank you for the time for sharing

Keith you never cease to amaze.me. I gotta tell ya, you make it look so easy. If I had all the toys you have in your toybox, I might eventually fiigure it out but the customer probably would want their car back within a couple of months.

Nice work Keith im just at an awwwwww ...this just blew me away doctor i am going to watch this several more times so i can catch up...lol.. Thank u man

Holy hell. If I hadn't seen it I probably wouldn't have believed it. No start due to climate control module. Unreal. Awesome diag Keith. Thanks!

Well time spent watching this kind of videos. Thanks Keith. Greetings from Dubai UAE.

New level Auto have a great day and take care New level Auto Thanks 👍 From Nick Ayivor from London England UK 🇬🇧

Absolutely excellent job getting to the problem Keith!

Wow! Keith, excellent diagnostic, keep them coming!

Well that was just bloody brilliant, yes wiring diagrams are needed but, that was impressive, Its just your total understanding of the systems your working on, that's so awesome when I watch you working. if theirs no one about, just give yourself a pat on the back from me, cheers buddy and thanks again for sharing excellent video

Yo Keith , the first thing that came to my mind when i saw this video was I CAN DO THIS THANKS A LOT THAT WAS A GOOD ONE !!!

Missed this video. Will definitely have to remember the way you diagnosed that. How to diagnose a bad module like a boss! 😎

That's the problem with today's cars. I know they are trying to save wires. But a HVAC module shouldn't stop the car from starting. Didn't think the low speed LAN would keep the car from starting, only the high speed. Thanks for making this informative video.

Love watching your work Keith. I must be learning I just answered my own question before typing it here and looking like a bozo Lol

Great demonstration of the process you go through, and how you decide to choose 1 route over another. It's certainly enlightening to watch. I can't wait to utilize all this new knowledge on cases. It's not too often I come across this intricate of a diag.

Nice find Sensei! You are the vehicle whisperer!

This makes it clear why Honda/Acura for example use a F-CAN network for their powertrain, drivetrain, brake/abs modules for fast bus-data and a separate B-CAN network for the rest of the body related modules; hvac, audio, door locks, windows, seats etc. Wait why am I comparing GM to Honda

Don't go into this without a wiring diagram he says :-) . The most important thing here by fair your brain. Thank you for letting us in on how it works .

I know you don't have much time so I do appreciate your longer video's

This is just amazing! Amazing brother ❤

splice packs are nicew when they are there!

If someone told me defective HVAC controls caused a no start condition, I'd laugh at them. Joke would be on me! Thanks, Keith!

ooh a new GM with CAN problems? Classic ;)

Keith you are the best...

Thanks for sharing the great video Keith. It's always great to see the way you pick the systems apart and make it easier to understand. I've been thinking about getting the OTC BOB since I don't have one yet

Your diagnosis is amazing.superb

Good video Keith! The OTC BOB works great with the flashing LED's. Makes it easier to see if you have com on a network. Splice packs cut diag time down as well.Especially when they are at an easy access point.

i had one of these last spring that was the issue, ended up finding that the terminal next to the data line is either power or ground and had bad contact melting the connector causing the fault. had to get a new module then build a new connector since a pig tail isn't available

the master at work!

Thank you for sharing Keith. Great info and amazing video quality!

Keith you are one clever cookie. Thanks.

Never disappoints, i wish every car had splice packs. Great share Keith. But u lost the race 🏁🤣

Very good! Just shows how fragile cars are nowadays... Great video, thank you for sharing!

Awesome video cant say I've ran across this failure on a traverse or Acadia great find!!

Awesome vid.! Man you inspire me to continue learning about can network.

Dang...Good one to know about.!! Thanks Keith. 😉😀

THIS CAN BE ONE OF THE SCARIEST SCENARIOS TO BUCK INTO ON A LATE MODEL CHEVY , BECAUSE THERE CAN BE SO MANY THINGS ALONE JUST ON THE NETWORK INTERACTIONS AND THERE IS NOT EVEN SOMETHING TO TRULY POINT YOU IN THE RIGHT DIRECTION THERE IS NO TEXTBOOK SILVER BULLET FIX OUT THERE I KNOW OF BECAUSE IT CAN GO SO MANY DIFFERENT WAYS . THAT IS WHY..., THAT FIRST INITIAL STEP IS SO VERY IMPORTANT KEITH YOU MUST HAVE LIBRARIES OF EXPERIENCES TO BE ABLE TO ZERO IN ON THIS ANOMALY AS QUICK AS YOU DO . YES AND WHAT IS THE TRUE SECRET TO REACHING THESE UNFATHOMABLE HEIGHTS PLEASE PLEASE DO TELL ? ? ?

Awesome as always

All I can say is WOW!

Good work, I got a cheap DLC-BOB on the way, i will find out how well it works 😂 cheers.

Very nice diagnosis sir. Show us more of this please.

you've got yourself a new subscriber...

Great video! Just like the Diagnose Dan video on a BMW not starting because of a short circuited door handle, man this engineers!

Great video sir, I'm working on a 2014 gmc traverse. No start only module not communicating is the immobilizer control module. I picked up a used one plugged it in and still nothing. Took it to the bench and desoldered the eeprom 95040 and transferred to donor. Still no comms. I have comms with everything else in the vehicle.

Sweet Problem! Great Diag!

Great job thank you for sharing!

Is this similar to VW and their K line? I have a 2004 Touareg with zero activity on the CAN lines and I'm now reading that it actually uses the K line for comms and not really CAN. The CAN lines from DLC connector to Instrument cluster (gateway) actually shows infinite resistance and I called a cluster because of that, no shorts of opens in the lines. 60 ohms on the CAN line coming out of the cluster but no activity. It's almost the exact same symptoms as this. I already unplugged all modules apart from airbag and HVAC which I need a special tool for. Powers and grounds are good.

Thx u don't stop making these videos

Great video.

awesome video , thank you very much it was very helpful , do you think all GM has Splice Pack - SP205 ???

Thank you for sharing this video.about lost communication problems.cool

I've got the same break out box but there is another brand on it. Nice wiring diagrams any good for Euros? Great work Keith i Really enjoyed this one!

You’re the man Keith

Do you know where is the other bus bar located?

Hey, thank you I need to step my game up and I need thousands of dollars for a scan tool The code reader is just not cutting it

Wow your a MONSTER 😁👍

Great job again like always

hey im trying to diagnosse a u0073 on a 07 equinox i have communication with the low speed modules nothing on the high speed side ive checked resistance in 6 and 14 getting a 5.27 mega ohms no crank no start trying to figure out how to gain communication again any help you be greatly appreciated its been driving me nuts! thank you so much !

That was very interesting! Thanks! 👍

Just watched this video again Keith like you told me. One question though why is there no activity on pin 2 that goes to the other splice pack. With all the modules that are on it I wouldn't expect a zero flatline.

What kind of idiot engineer would think a climate control system should be able to prevent a car from starting?

Splice packs are good except when they're in a location that can get wet like under the driver's seat.

im having this issue with traverse. how much does this usually cost to fix

Can you test for this with just a volt meter? My car shut off while driving after the dash light up and radio shut off.

thanks for the effort of sharing it

I see you switched CAN breakout boxes from the AES LineSPI (SMART BOB) to the OTC (3415) CAN Test Box ... reason why?

great job as always

If manufacturers would stop making modules that would crap out and take down the whole data bus, that would be great..

Well done keith

Thats was an awesome video keith. My question to u is. I have a shop behind my house with 3 bays just 1 lift right now and im doing quite a bit of automotive stuff on the side of my full time job. I have been using all data diy up to this point when i need diagrams but i would love to get your view on info platforms. If u had to have 1 in my type of situation where diag is obviosly a part of what i do but also lots of repairs. Rusty ones cause up in northern ny utica area. Lol. Just wanted your valued opinion on what would be the best for my money

Outstanding 👍🏻👍🏻👍🏻👍🏻👍🏻

How does the scan tool communicate with the radio, for example, when you have the junction connector jumper removed? Doesn't that isolate all the modules?

EXCELLENT

The stuck-in-the-past people will complain about how it's possible for the HVAC to cause a no-start, when their Ford Model-T didn't have this problem, it does however make perfect sense from a technical standpoint in relation to how things are necessarily networked on modern cars. What does not make sense however, is why a bad module is able to short the network data line to supply voltage. Any reasonable network transceiver should be designed to fail open circuit, and should have opto, or even better magnetic isolation. The fact this module can fail short circuit on the data bus is just pure crappy/lazy/cost saving, poor engineering, in this case you can't help buy hate GM for being deliberately irresponsible, when an extra 10cents spent could avoid this situation entirely.

Why does it read 0 volts when jumping pin 2 Keith.

So JX205 is purely testing connector ?

Exselete diagnostic amigo nice video

Very informative Keith. Thanks for showing the OTC Tool. Is that similar to the AESwave tool? 👍

Awesome!!!

awsom work as ever

Another broken Cheeeeeeeeeeeeevy! I put up my first video today Uncle Keith with some diesel and Autologic 🤭

Hey Keith do you have the other style breakout box ? Gateway I believe..

Great video

So why was the wave form looking that way...ur vidios r kool 👍