There is no way to permanently disable the auto start stop on the vehicle. Several others have complained about this, no response from GM. There needs to be a firmware upgrade to the ECM to allow the owner make the decision on if that is enabled or disabled. On mine, I have to push a button each time I start the engine to disable that. Some GM vehicles don't have that option.

- Omaha, NE, USA

The contact owns a 2020 GMC Sierra 1500. The contact stated that the vehicle push start button and key fob failed to start the vehicle on first attempt. The contact stated that the vehicle started after severals attempted. The contact stated the failure occurred intermittently. The check engine warning light illuminated. The contact stated that on his way to mckenzie Buick-GMC dealer, 6500 caroline St, milton, fl 32570, the check engine warning light was not illuminated, the vehicle was diagnosed and the contact was informed that a failure code was not found. The vehicle was not repaired. However, the contact called back the same dealer and informed them that the failure recurred. The vehicle was not yet taken back to the dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 86.

- Pensacola, FL, USA

Vehicle equipped with L87 6.2L. At 197 miles engine suddenly ceased operating and would not restart. This occurred while stopped on private road. Vehicle had to be towed to dealership where they found P0300 and diagnosed broken #4 cylinder exhaust valve spring.

- Yorktown, VA, USA

My 2020 GMC Sierra brakes failed on May 22nd and ECM and now the engine and transmission are experiencing issues based on the onstar report.

- San Antonio, TX, USA

Parked truck for one hour, engine off. Came back and upon startup, received multiple errors that power steering and ESC required dealer attention. Brake pedal would depress to floor. GMC Sierra 1500 elevation trim

- Bartlesville, OK, USA

Ruptured oil cooler line. Draining the engine of oil and causing lock-up.

- Royersford, PA, USA

Engine like keeps coming on. Code reading the knock sensor needs to be repair. Sensor has been replace twice in the past three months.

- Houston, TX, USA

Smell of smoke strong in the cab and outside hood of truck. Also have seen smoke coming from hood of truck. Smells like burning electrical or plastic

- Greensburg, PA, USA