Brand New Yukon - Warning light driving home from dealership

[SCUCREW08]

Proud/Frustrated owner of brand new 2025 Yukon XL Denali with reserve package and air ride (not the capability package with the elocker, just air ride).

Anyways, bought the car on February 28th, picked up the next day on March 1st after detailing. On the ride home, I noticed that the forward "collision warning system unavailable" message was showing up, along with the warning light. Also intermittently it wouldn't flash that the "Rear Pedestrian Warning" was unavailable. The car lane assist wouldn't activate, nor would adaptive cruise, or supercruise. Also I noticed that speed limit signal were not showing up on the HUD. Drove the car for 6 days and brought it in last Thursday for the service appointment and to pick up the GMC all weather mats for all 3 rows.

3 days (business days), 5 calendar days later, and per checking in with them today, they still don't have a clue what is wrong. So frustrating to save for a 100k vehicle only to have it poop the bed on the drive out of the dealership. Not mad at the dealer, they gave me a rental car to use, but frustrated as hell at GM. Sorry to vent, but hoping/not hoping someone else has had this happen and they might have a solution!

Absolutely loved the car and the refreshed interior for the few days I got to drive it!

 

[Bigburb3500]

This almost sounds like the truck didn’t have the full PDI service wasn’t done and something/one in the service department did not check all the boxes to turn on all your features?

 

[SCUCREW08]

Yeah, they have been slowly going through each of the systems. At first they thought it might randomly be related to the rear seat entertainment (no clue how they came to that), but then they were thinking front camera, and then image processing sensor..., so far....we're still at square one....

 

[LegalBrief]

They are being guided by the factory… it’s probably a bad module.. or shorted wire (or bad connector)… take time to trouble shot.

You could go talk to the general manager, he may step up (don’t count on it’

 

[jfoj]

The speed limit sign will not show up on the HUD all the time. Depends if the vehicle has Super Cruise or not. On non Super Cruise vehicles the speed limit sign is from the GPS database. My street which has a 25 MPH speed limit shows up as 55 MPH! Often there are no speed limit signs depending on what is in the database, sometimes when road constuctions is going on the database is not up to date and they put a null value in for speed. I have an area where the highway construstion has been completed and the data has not been updated yet.

If you have Super Cruise, I cannot confirm if the cameras will actually "Read" the speed limit signs, this is what I have been led to believe. It may just be pulled from the GPS database.

As for some of the other issues, if the windows are wet, the windows are foggy or even if the exhaust is steaming, you can get unusual/strange behavior.

I have had the front Collision Warning turn yellow often when starting the vehicle cold sitting outside and/or if the window is frosted or has a bit of moisture. When backing up I have had the Pedestrian warning many times due to steam from the exhaust being detected.

I have even had the front collision warning flash the HUD red and vibrate the seat a number of times when there was a car turning in front of me that was no where near a collision, but I must have been closing in at a rate the software was triggered. But the vehicle was turning out of my way and was maybe only 1/4 still in shoulder of the road.

So before you have the dealer tear the truck apart, you might want to pick it up and drive it for a few weeks. There might even be some over the air update that may resolve the problems as well.

 

[Silverado4x4]

If you have Super Cruise, I cannot confirm if the cameras will actually "Read" the speed limit signs, this is what I have been led to believe. It may just be pulled from the GPS database.

The camera system doesn't actually read the sign like a person it all comes from the GPS

 

[jfoj]

The camera system doesn't actually read the sign like a person it all comes from the GPS

I was pretty sure this was the case, however, I had seen people referencing that the speed limit signs were read by the front camera, which I thought was HIGHLY unlikely, but since I have done ABSOLUTELY no research into Super Cruise (because I have NO interest in someone writing software for driving my car that likely has never driven and/or takes public transportation) I did not want to state something that may have been incorrect.

I think with anyone that is updating to the newest technology they need to live with it a few weeks before they get to concerned it is not working correctly. I have had many occasions where my front Collision Avoidance and/or Lane Correction did not work because of ice, frost or dew on the cameras and/or sensors. Usually after driving for a while, the systems start to function and any errors or lights clear automatically.