2024 Yukon XL Diesel - getting towed

[flynfish]

New Yukon XL with 7,938 miles. Wife just left neighborhood to take kids to school and the car shut down and won’t restart. Saying there is an emissions issue, so now waiting to have this towed to the dealership it’s crazy that it won’t even let me restart and limp along to move it out of the street.

 

[flynfish]

Update: tow truck showed up. You can’t put the vehicle into neutral without starting the engine and he didn’t have the wheel rollers that would be needed. I decided to try disconnecting the battery, which actually worked. I started the car fine and drove it to the dealer for them to look at. Seems like a possible electronics problem? Unfortunately disconnecting the battery clears the codes they said, which is crazy that they don’t get saved in GMC system. I got an alert from the GMC app about emissions issues, so why couldn’t that save the issue?

 

[StephenPT]

All DTCs are stored. It might not be an active DTC anymore, but even a $10 Bluetooth code reader from Amazon can tell you history codes. More advanced scan tools can show you FFD (freeze frame data) that can give a tech a glimpse at various sensor readings before the fault code occurred.

If the dealer says they can’t see the fault code then I would go to a different dealer.

 

[flynfish]

Ok that makes much more sense to me. I couldn’t believe that disconnecting the battery would cause all history to be erased.

 

[OR VietVet]

Yea, that dealer either didn't want to deal with it and told you a story or they had their heads up their collective asses.

 

[StephenPT]

Just out of curiosity - what’s your DEF level?

 

[JayceeP]

When’s the last time any DEF fluid was added?

 

[Stbentoak]

IF DEF was the issue, there would have been warnings on the DIC that fluid level was getting low, etcetera.
My guess is an electrical issue, these things just don't go "bam" and shut down unless something isn't communicating/connecting.

 

[flynfish]

Def was 75% level, so it wasn’t that. Definitely seems like an electrical issue. When I had it in for an oil change a month or two ago, they did a software update that was required. After that, when you start the car and drive, the radio audio wouldn’t play unless you changed the channel. I brought it in to have them check things and they said they needed to replace the whole thing based on the diagnostic result.

So maybe the radio issue has some relevance to what was going on?

 

[GMCnewbee]

Maybe your Dealer needs an update.