GMC Sierra 1500 Classic

Bought the vehicle brand new at the end of april. 2 weeks later and at 557 miles, the engine had a lifter failure and needed to be replaced. One day after picking it up after the engine replacement, a fuel injector went bad and needed to be replaced. About 2 days ago, the check engine light lit up, and the GMC app said it was a code for the transmission system (popped on after attempting to remote start the vehicle, although the light did shut off on its own the next day after a software update…

I bought the vehicle brand new in april 2026. On May 3rd, approximately 2 weeks after I bought it, I experienced a lifter failure that caused metal to get into the oil pan/engine and the engine needed to be replaced. About a month later after repairs were complete, I picked up my vehicle on a Friday night, and the very next morning, had issues again. Took it back to the dealer and a fuel injector went bad and needed to be replaced. I recently attempted to use the remote start feature and as…

I am filing a formal safety complaint regarding my 2022 GMC Sierra 1500 Denali (5.3L engine). This vehicle has exhibited a pattern of severe electrical, fuel system, and active safety sensor failures that pose a direct threat to occupant and public safety.At approximately 4,000 miles, the high-pressure fuel injectors suffered an early-stage mechanical failure requiring dealer repair.At approximately 24,000 miles, the vehicle suffered a catastrophic, un-warned total power shutdown while driving…

rocker arms replacement at 5,000 miles on my truck. Palm Harbor Tasca GMC

While driving down an isolated 2 lane road in West Texas, the engine in my 2021 GMC Sierra 1500 began making knocking sounds and vibrating badly. The truck's acceleration was extremely sluggish and the vibration worsened at slow speeds. I was able to slowly make my way back towards a dealership, where the diagnostic teardown revealed a bent pushrod and camshaft damage.

What component or system failed or malfunctioned, and is it available for inspection upon request? The truck has lost power unexpectedly while driving, and lately I've also noticed some lag when I accelerate. The truck is available to be inspected. How was your safety or the safety of others put at risk? The truck suddenly lost power while I was driving and told me to restart the vehicle. Losing power unexpectedly almost caused me to get stuck in an intersection and could have caused an…

On 4/30/25- I took my truck to the dealership due to receiving a recall notice (engine propulsion) in the GM app. No codes camp up and got the all clear. Dealer did not change oil to 0/40 nor air filter. Advised GM had not provided the recommended oil yet On 10/06/25- the Engine propulsion fix was completed. Oil changed to 0/ w40. Engine module reprogramming completedNext. On 3/07/26- dropped off my Sierra truck at dealership. Ticking sound. Confirmed engine replacement was needed even…

For close to one year, there feels like a catch, grind, stall, or slight shake, mostly while the vehicle is shifting gears, made worse or noticed more by higher speeds like driving on the highway vs. slow city streets. It's difficult to explain or assess so not sure if it is the engine or transmission. With the open recall from GMC on some vehicles with the same engine as mine it is concerning that maybe it should have been included.

The forward-facing camera module and related Advanced Driver Assistance Systems (ADAS), including Adaptive Cruise Control and Lane Keep Assist. The system has failed repeatedly, with the camera replaced three previous times. On XXX, the vehicle performed unintended hard braking at approximately 70 mph on the interstate, after which Adaptive Cruise Control and Lane Keep Assist became inoperative. Similar hard-braking events followed by system failure also occurred approximately one month prior…

During a family camping trip, our engine seized without warning — a failure directly tied to an active GMC recall. Despite this being a manufacturer defect, GMC roadside assistance refused to provide full support and informed us that we were responsible for towing our trailer home. This placed an unreasonable financial and logistical burden on us during an already distressing situation. To make situation worse when we brought the vehicle to O’Meara GMC for the recall repair Four months…