Check engine light/ABS/Trailer brake/etc

[Murwg15]

Anybody had the following issue before?

New 2023 AT4 picked up in March. About 2K miles on it now. Starting pretty early after pickup, probably around 300 miles in, I would get alerts to service ABS/trailer brake/traction control/forward collision alert. Doesn’t seem like there’s any action or maneuver that causes the alert, as far as i can tell. They all go off at once, and the check engine light comes on at the same time. All alerts would usually resolve after about an hour and a restart of the car, but the check engine light would remain on for about 12-24 hours before eventually resolving on its own. This occurred about every 1/3 of the time.

Took it in for service, they replaced some speed sensor on one of the wheels and told me it was fixed.

Within an hour of pickup, I get the same errors again, and now it occurs more frequently, and the check engine light is almost always on.

Anyone have any ideas or had this happen? Have to find another time to take it in for service but work schedule makes it almost impossible.

 

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[Wakinvol]

Wiring harness over frame around alternator. Just had mine fixed. Hopefully that’s the source of your problems.

 

[Murwg15]

Wiring harness over frame around alternator. Just had mine fixed. Hopefully that’s the source of your problems.

Thank you so much. Hopefully that’s it. Super annoying issue.

 

[Wakinvol]

Mine would go into limp mode (happened twice). Definitely sucked. More than likely it’s a chaffed wire in that area.

 

[Murwg15]

Bump as I'm still having this issue

I've taken it to the dealer TWICE now with the same issue recurring within 24 hours of vehicle pickup.

Same exact alerts. "service ESC, trailer brake, abs" with forward collision alert system going down and check engine light coming on.

Dealer (Sunrise GMC Collierville in Memphis, TN) told me they "took off my suggestion regarding the wiring harness" because they didnt want to insult the mechanic....give me a ****** break. They replaced a rear wheel speed sensor, which didn't fix it. Then I took it back and they replaced the brake control module. Problem came back the day after I picked it up.

Does ANYONE have any other ideas? I'm scheduled to take it back Tuesday and I want to give them a list of things to check. This is ridiculous.

 

[Moondog023]

Bump as I'm still having this issue

I've taken it to the dealer TWICE now with the same issue recurring within 24 hours of vehicle pickup.

Same exact alerts. "service ESC, trailer brake, abs" with forward collision alert system going down and check engine light coming on.

Dealer (Sunrise GMC Collierville in Memphis, TN) told me they "took off my suggestion regarding the wiring harness" because they didnt want to insult the mechanic....give me a ****** break. They replaced a rear wheel speed sensor, which didn't fix it. Then I took it back and they replaced the brake control module. Problem came back the day after I picked it up.

Does ANYONE have any other ideas? I'm scheduled to take it back Tuesday and I want to give them a list of things to check. This is ridiculous.

What’s you engine code?

 

[Murwg15]

What’s you engine code?

Going to show my novice and admit I don't know where to find it...the somewhere in the VIN i'm guessing? 2023 AT4 purchased 3/23

 

[BlackPAAT4]

Bump as I'm still having this issue

I've taken it to the dealer TWICE now with the same issue recurring within 24 hours of vehicle pickup.

Same exact alerts. "service ESC, trailer brake, abs" with forward collision alert system going down and check engine light coming on.

Dealer (Sunrise GMC Collierville in Memphis, TN) told me they "took off my suggestion regarding the wiring harness" because they didnt want to insult the mechanic....give me a ****** break. They replaced a rear wheel speed sensor, which didn't fix it. Then I took it back and they replaced the brake control module. Problem came back the day after I picked it up.

Does ANYONE have any other ideas? I'm scheduled to take it back Tuesday and I want to give them a list of things to check. This is ridiculous.

Lots of people having this issue. GM needs to resolve.

2023 LZ0 AT4 electronics, trans, dash goes suddenly goes crazy, check engine, will not shift - truck goes insane

First, I love my AT4. I am typing this to help others until GM decides to put out a service bulletin or a recall on the problem. The only reason I put up with this is because I travel a great deal and was able to leave the truck at the dealer for extended periods of time. This is a brand new...

www.at4forum.com

 

[FrankAbagnale]

I bought my 23' AT4 in Feb and had this issue happen to me in May. I went to the store last Sunday, and the same thing happened. I had to have it towed to the dealership.

Pretty irritating that this seems like it's going to happen every few months, but the worse part for me is no dealership can get me in! It's been sitting at the dealership for a week now, and they haven't even pulled it in to look at it. They are telling me they might not have time for another week. I called multiple other dealers, and they all said the same thing. So much for a warranty if they can't even service them!

These guys could care less as well. They keep telling me I should have made an appointment! Who the hell makes an appointment for a brand new truck to break down and need to be towed in?! I told them to go ahead and make an appointment for me every month, just in case.

I love the look of the truck, the diesel has been getting great fuel economy, but I'm over here starting to research the Tundra. Not sure if I will make the switch, but I can't keep going through this.

 

[kobra357]

Anybody had the following issue before?

New 2023 AT4 picked up in March. About 2K miles on it now. Starting pretty early after pickup, probably around 300 miles in, I would get alerts to service ABS/trailer brake/traction control/forward collision alert. Doesn’t seem like there’s any action or maneuver that causes the alert, as far as i can tell. They all go off at once, and the check engine light comes on at the same time. All alerts would usually resolve after about an hour and a restart of the car, but the check engine light would remain on for about 12-24 hours before eventually resolving on its own. This occurred about every 1/3 of the time.

Took it in for service, they replaced some speed sensor on one of the wheels and told me it was fixed.

Within an hour of pickup, I get the same errors again, and now it occurs more frequently, and the check engine light is almost always on.

Anyone have any ideas or had this happen? Have to find another time to take it in for service but work schedule makes it almost impossible.

Ik its been a few months. Not sure if you resolved this. Did you add anything new to it like a Pulsar LT?

 

[cjblake09]

Ik its been a few months. Not sure if you resolved this. Did you add anything new to it like a Pulsar LT?

Mine did a little of this yesterday with the ABS lights going on and then the check engine light. I pulled the code and it was a P25A2. I am waiting on the dealer to call me back tomorrow but at least i have a free rental car at moment. I only have 2200 miles on mine for what it is worth.

 

[kobra357]

I have 6000 miles and mine did this too. It was a wire issue

 

[cjblake09]

I have 6000 miles and mine did this too. It was a wire issue

Same code as mine?

 

[kobra357]

Same code as mine?

Yes but more parking brake, TC, service 4WD and ESC.

 

[cjblake09]

Just got the truck back from the dealer and they said the speed sensor in of of the tires was dirty and that was causing the CEL to come on. I have not even taken the truck off road yet! We shall see if it happens again as i am headed to the ranch this weekend.