My 2023 GMC Yukon 6.2L Story – From a Random Stall to an Engine Replacement Decision

[MikeP]

I want to share my experience with my 2023 GMC Yukon (6.2L) in case it helps someone else or if others have gone through something similar.


Everything started with what seemed like a very isolated and strange event. While driving on the highway, the engine suddenly shut off. There were no warning lights, no messages other than the dashboard asking me to press the start button again. I did, the vehicle restarted immediately, and it kept driving normally. Still, it didn’t feel right to me, so I decided to take it to the dealership.


When the vehicle arrived at the dealer, it was driving normally and showed no fault codes at all. After a day, they returned it to me saying they couldn’t find anything wrong. I even thought to myself that maybe it had been something as simple as the battery or a one-time electronic glitch.


The next day, driving around the city, I noticed that Auto Start/Stop was no longer working. A few minutes later, the Yukon shut off again in the same way — clean shutdown, no warning lights, just a request to press the start button. That’s when I brought it back to the dealership for a second time.


After more testing, the dealer told me they believed the issue was related to contaminated or poor-quality fuel and that they had performed a cleaning. Before I could even go pick it up, they called again to tell me the situation had escalated: the vehicle had stopped starting altogether and was now showing multiple fault codes. At that point, the case was escalated to GM Engineering.


What has been hardest for me to process is that the vehicle entered the dealership fully operational, without codes, and the situation became much more serious during the diagnostic process, not during normal use. I never experienced loud mechanical noise, constant misfires, warning lights, or major drivability issues before all of this unfolded.


GM Engineering has now determined that the appropriate solution is a full engine replacement under warranty. I understand that this can be a valid technical decision, but as an owner, it’s unsettling to go from a random stall with no codes to a complete engine replacement in such a short time.


I’m sharing this not to blame anyone, but to understand if others have experienced something similar:
– A Yukon or related GM SUV that stalled with no initial codes
– A situation that escalated quickly after dealership diagnostics
– An engine replacement that was approved even though the vehicle originally drove in normally


If you’ve had an engine replaced in a Yukon/Tahoe/Escalade, I’d really appreciate hearing how things went long-term. Did the vehicle regain your confidence? Was the engine new or remanufactured? Did GM provide any additional warranty or goodwill support?


This has been a stressful experience, mostly because of the uncertainty, and hearing real experiences from other owners would help a lot.


Thanks for reading and for any insight you’re willing to share.

 

[2024 White Tahoe]

I want to share my experience with my 2023 GMC Yukon (6.2L) in case it helps someone else or if others have gone through something similar.


Everything started with what seemed like a very isolated and strange event. While driving on the highway, the engine suddenly shut off. There were no warning lights, no messages other than the dashboard asking me to press the start button again. I did, the vehicle restarted immediately, and it kept driving normally. Still, it didn’t feel right to me, so I decided to take it to the dealership.


When the vehicle arrived at the dealer, it was driving normally and showed no fault codes at all. After a day, they returned it to me saying they couldn’t find anything wrong. I even thought to myself that maybe it had been something as simple as the battery or a one-time electronic glitch.


The next day, driving around the city, I noticed that Auto Start/Stop was no longer working. A few minutes later, the Yukon shut off again in the same way — clean shutdown, no warning lights, just a request to press the start button. That’s when I brought it back to the dealership for a second time.


After more testing, the dealer told me they believed the issue was related to contaminated or poor-quality fuel and that they had performed a cleaning. Before I could even go pick it up, they called again to tell me the situation had escalated: the vehicle had stopped starting altogether and was now showing multiple fault codes. At that point, the case was escalated to GM Engineering.


What has been hardest for me to process is that the vehicle entered the dealership fully operational, without codes, and the situation became much more serious during the diagnostic process, not during normal use. I never experienced loud mechanical noise, constant misfires, warning lights, or major drivability issues before all of this unfolded.


GM Engineering has now determined that the appropriate solution is a full engine replacement under warranty. I understand that this can be a valid technical decision, but as an owner, it’s unsettling to go from a random stall with no codes to a complete engine replacement in such a short time.


I’m sharing this not to blame anyone, but to understand if others have experienced something similar:
– A Yukon or related GM SUV that stalled with no initial codes
– A situation that escalated quickly after dealership diagnostics
– An engine replacement that was approved even though the vehicle originally drove in normally


If you’ve had an engine replaced in a Yukon/Tahoe/Escalade, I’d really appreciate hearing how things went long-term. Did the vehicle regain your confidence? Was the engine new or remanufactured? Did GM provide any additional warranty or goodwill support?


This has been a stressful experience, mostly because of the uncertainty, and hearing real experiences from other owners would help a lot.


Thanks for reading and for any insight you’re willing to share.

Was your vehicle subject to the GM engine safety recall?

If so, had it been checked and cleared prior to your last service visit? If not, were you waiting to have it checked under the recall?

 

[GMCnewbee]

Thanks for the report, and very sorry that you are having to deal with this. What you have is the nightmare we are all worried about happening to ourselves. The reports of engines dying on the highway in traffic are even worse. Our 2022 Denali now has 25k on it and (knock on wood) so far so good. It did pass the PICO test and is now on 0W40 but many of us on the Forum are not convinced that is a solution, more like a Band-Aid.

My only hope for myself is that the percentages so far seem to indicate 90% of the 6.2 engines will survive. Reports like yours can help us keep track of what is really happening. How many miles were on your 2023 6.2 when this happened? Going forward, I am not planning on keeping the vehicle forever. Just waiting for the new engines and some reporting on how good or bad they might be.

 

[Joseph Garcia]

I'm sorry to read about your experience. Losing trust in your vehicle is serious, for sure.

I'm curious about your comment on 'no codes'. How was this assessed? Do you have a quality bi-directional scanner and determined yourself that no codes were present?

 

[MikeP]

Was your vehicle subject to the GM engine safety recall?

If so, had it been checked and cleared prior to your last service visit? If not, were you waiting to have it checked under the recall?

Yes it was allready checked and cleared

 

[MikeP]

Thanks for the report, and very sorry that you are having to deal with this. What you have is the nightmare we are all worried about happening to ourselves. The reports of engines dying on the highway in traffic are even worse. Our 2022 Denali now has 25k on it and (knock on wood) so far so good. It did pass the PICO test and is now on 0W40 but many of us on the Forum are not convinced that is a solution, more like a Band-Aid.

My only hope for myself is that the percentages so far seem to indicate 90% of the 6.2 engines will survive. Reports like yours can help us keep track of what is really happening. How many miles were on your 2023 6.2 when this happened? Going forward, I am not planning on keeping the vehicle forever. Just waiting for the new engines and some reporting on how good or bad they might be.

Hello! My Yukon was under 0W40, it had its racall cleared and was free to go jeje , I have 18K miles,

 

[djsassan]

Sit back and enjoy a cup of coffee as you read this:

The engine on the Yukon I got as a replacement for the Yukon that got two engine replacements needs replaced. Yes, you read that correctly.

Yes, I wrote that title like that on purpose. At this point, I can only laugh at the situation. Backstory (super abbreviated): 2021 Yukon XL Denali bought at 36k miles. Engine blew at 40k-ish and was replaced under warranty, then th new engine failed at 142 miles and replaced, then a third...

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