Within 3 months (<4000 miles) from purchase vehicle began sputtering with hesitation, and ticking noise from engine while in motion followed by multiple alerts posting on driver display. Vehicle displays loss of power, and struggles to keep up with traffic. Check engine light flashing followed by constantly staying on, service ESC system activated, service parking brake, and steering assist reduced drive with caution lights all activated during this episode. Dealer worked on vehicle engine ( and completed on or around 1/08/2021), and replaced lifters, and oil control valve. On 01/13/2021 noticed that vehicles lane keep assist is now working sporadically, will not activate consistently when vehicle veers off the properly marked lanes on high-way/roads, and inconsistently alerts driver while in motion. The lane keep assist is suppose to correct steering, but this does not happen consistently. The collision alert system does not activate or work correctly. Noticed while driving that vehicles in front are not detected correctly, and informs the driver they are within safe distance (green this suddenly changes to yellow). In addition when vehicles in front apply brake, the collision alert system does not alert as it is supposed to, it stays in green even at extremely close range. Safety mechanisms don't appear to work correctly, and detects items that are not present. Noticed that vehicle detects lanes even on unmarked roads, and the front pedestrian alert system activates sporadically even if no pedestrians are in front of vehicle while driving. Concerned about safety features leading to hazardous driving conditions.
2020 GMC Sierra 1500 engine complaints
Page 10 of 10: complaints 251 to 260 of 260, newest first, as owners wrote them.
The engine failed at 5100 miles and is currently being repaired by the dealership. I requested a new car replacement.
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.
Tl* 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.
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.
My 2020 gmc sierras brakes failed on may 22nd and ECM and now the engine and transmission are experiencing issues based on the onstar report.
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
Ruptured oil cooler line. Draining the engine of oil and causing lock-up.
Engine like keeps coming on. Code reading the knock sensor needs to be repair. Sensor has been replace twice in the past three months.
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
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