2019 GMC Yukon NO Trans Gears, NO Tachometer, NO Oil Pressure, NO Power Steering SECOND TIME!

[BlaineBug]

Today on Friday, the issue presented itself again. I was fortunately able gain control of the vehicle after multiple restarting attempts so that I could drive it to the same dealership that it was at on January 13th, rather than having to be towed in again. This just happened about an hour and a half ago. All of the symptoms that I described last time happened exactly the same again today, with the exception that after multiple restart attempts I was able to drive away just as if nothing happened.

Once again, they checked the codes and nothing was stored. However this time more people were involved at the service desk. A staff member was looking through the service history and noticed that it came in for some electrical issue in Missouri but that they didn't know what for and would look in to it further. I do know that this vehicle was from Missouri as I saw the Missouri title from Carmax when I bought on December 10th, 2019. I wish the dealership would have dug deeper at the service history the last time I was in.

 

[wjburken]

Today on Friday, the issue presented itself again. I was fortunately able gain control of the vehicle after multiple restarting attempts so that I could drive it to the same dealership that it was at on January 13th, rather than having to be towed in again. This just happened about an hour and a half ago. All of the symptoms that I described last time happened exactly the same again today, with the exception that after multiple restart attempts I was able to drive away just as if nothing happened.

Once again, they checked the codes and nothing was stored. However this time more people were involved at the service desk. A staff member was looking through the service history and noticed that it came in for some electrical issue in Missouri but that they didn't know what for and would look in to it further. I do know that this vehicle was from Missouri as I saw the Missouri title from Carmax when I bought on December 10th, 2019. I wish the dealership would have dug deeper at the service history the last time I was in.

interested to see what they come back with.

 

[BlaineBug]

I'm hoping so as well. They also mentioned reaching out to get GM involved. I have personally been speaking with a "Chevrolet Executive Resolution Liaison" for about the last 5 weeks since the first incident and it hasn't led to much thus far. Maybe this time more action will be taken as it is the second offense. But then again without the issue presenting itself to the technician while in their care, all they are going to do is throw parts at it. As if my confidence in the vehicle couldn't be anything but low, it's definitely dropped further after this repeat ordeal.

I love the vehicle overall but these intermittent issues couldn't do anything else but lower my confidence in the reliability.

 

[BlaineBug]

It is obviously apparent that TSB # 18-NA-161 was NOT the fix for this problem. Which is what I assumed from the beginning, considering that the last time they claimed to not find anything wrong. Issues don't just resolve themselves without any external input to rectify the issue. Here's to wishful thinking that General Motors will take the issue more seriously this time........but I'm just awaiting the typical response of "could not duplicate customer concern" to rear its ugly head again!

 

[JohnnyR]

This sounds like my issue, reported here https://www.tahoeyukonforum.com/thr...ll-gears-but-1-etc.117019/page-2#post-1420173

Fix, which was only done when dealer was able to replicate failure mode at the dealership (they wouldn't replace any modules without definitive evidence "because GM won't pay us if it doesn't fix the issue") was to replace:
Module 84293872 - Bluetooth wifi module.

It's absolutely insane that this totally non-essential module could fail the entire vehicle. Really poor engineering foresight on GM's part.

 

[BlaineBug]

Thanks Johnny, sorry that you had to re-type that per our conversation in your own thread, but you mentioned posting and I didn't see it. What does GM think about a problem coming in for service multiple times without a fix applied?

Including your own NHSTA complaint for your 2020 Suburban I am also finding two other similar complaints on a 2018 and 2019 Tahoe, and of course my 2019 Yukon which has not yet processed.

 

[BlaineBug]

I received a call from the GM service center today saying that a new ECM has been ordered. I inquired how they were able to determine that the ECM was the culprit but was told by the service adviser that they will have to get back to me on that. I will update again when I hear more.

 

[Jeramia]

question. If you contacted on-star at the time of the problem, could they be used to verify with GM about your problem?

 

[BlaineBug]

question. If you contacted on-star at the time of the problem, could they be used to verify with GM about your problem?

That's a good question. I did not try that, but I also do not have an active subscription to Onstar. If it happens again I will have to try.

I received a call back from the dealership about the ECM replacement and they told me that the technician coordinated with General Motors technical support and that replacing the ECM was at the suggestion of GM because "that's the only code they were getting." I don't know what code they were getting this time, however, the last time I had the vehicle towed in January, the three history codes that they said were present (according to the service invoice) were the following;

1) U0100 (Lost Communication With ECM/PCM "A")
2) U0121 (Lost Communication With Anti-Lock Brake System (ABS) Control Module)
3) U0422 (Invalid data received – body control module)

So basically this sounds like somewhat of a guess because they told me "we'll replace the ECM and go from there."

 

[BlaineBug]

Got my Yukon back today after 17 days. The ECM was replaced as previously noted, but one additional item that was found was that ground #141 was found to be full of undercoating. I'm not exactly sure what that means or where that ground is but it was my understanding that the frames were waxed. Regardless, I'm not sure why they are still mentioning TSB 18-NA-161 which is what they supposedly completed the first time in January.

Still mentioning that the only code found was U0100 for "loss of communication with the ECM." It was from the advisement of GM TAS that the ECM be replaced, so that's what they did.

 

[wjburken]

but one additional item that was found was that ground #141 was found to be full of undercoating. I'm not exactly sure what that means or where that ground is

If you open the attached PDF in Adobe and search for g141, you will find that it is one of the two grounds coming off of your battery.
https://www.gmupfitter.com/files/media/photo/836/18_Sierra_Body_Builder_2017AUG31.pdf

 

[BlaineBug]

Interesting! That would be great if that was the problem all along.

By the way, that .PDF is definitely worth saving. Thank you.

 

[YukonXLMan]

Very interesting that multiple posts on this forum point to the battery grounds for a host of issues. Once you have a chance to put your vehicle through the paces a bit, please let us know if it solved the problem.

 

[Tahoe14]

I sure hope it works out for you this time. You have been through enough. I remember my Lemon Law case in Florida and they put me through the ringer but in the end I was successful. Lots of electrical gremlins on an early build 2015 Tahoe and I wonder if it was a ground issue that they could not find or were not willing to even try to find. Lots of part chasers out there now instead of trying to get to the root cause.

 

[BlaineBug]

That's certainly right. All of the truck platform models seem to have a lot of issues with various grounds. Where's the QC?

I spoke with a Lemon Law law firm already as a backup plan. I won't get into the details here since this is a public forum but as a last resort it is on the back burner. I also did buy this Yukon used with 34,000 miles. Build date of September of 2018, bought it in December of 2019. It was a Hertz rental.

I honestly do like the truck and would most forgiving-ly prefer to keep it so as long as the issues do not re-occur. But that's an uncertainty considering they've already come back twice. I wish they would have found whatever was wrong with this ground the first time. Just shows that, like you said, the length of time at which things are investigated is sometimes sub-par.

Don't forget about the G218 ground issue on the dash that was an issue for all trucks and SUVs built prior to June of 2015. Bleh. Whoever is doing their job isn't paying attention. I don't think a robotic arm tightens down these grounds, or do they?

I haven't taken the time to find this ground thus far, so for now I'll take the tech's word from his notes.

 

[cireallin]

I had a ton of weird issues and a battery replacement fixed them all. I even had the battery tested and it showed fine. Finally replaced it and most of the gremlins went away immediately.

 

[sealandsky]

Can anyone provide a schematic, photos or description of all the ground points on a Yukon Denali? I'd like to start working my way through them...

 

[BlaineBug]

Can anyone provide a schematic, photos or description of all the ground points on a Yukon Denali? I'd like to start working my way through them...

What issues are you experiencing?

 

[BlaineBug]

I had a ton of weird issues and a battery replacement fixed them all. I even had the battery tested and it showed fine. Finally replaced it and most of the gremlins went away immediately.

What were the issues that you had?

 

[cireallin]

What were the issues that you had?

Radio freezing, warning sensors coming on randomly, seat presets not working randomly, stability track service warning. It was literally like a gremlin was in the electrical, until the battery was replaced.