GMC Complaints

The front upper grille molding/deflector located above the front grille and directly below the hood on my 2022 GMC Sierra 1500 has become loose and is separating from the vehicle. The left side attachment points appear to have failed, allowing the plastic component to visibly move and lift while driving at highway speeds. The condition worsens with airflow, and the part vibrates and flexes significantly while traveling on the freeway. This creates a safety concern because the component appears at risk of detaching completely from the vehicle and becoming roadway debris, potentially striking other vehicles or causing drivers to take evasive action. No warning lights or dashboard messages were present prior to discovering the issue. The problem was first noticed after observing movement of the grille trim while driving at normal highway speeds. The vehicle has not been involved in any collision or modification that would cause this condition. A GMC dealer inspected the concern and confirmed the vehicle is not currently included in an active recall despite an existing GMC recall addressing grille deflector detachment on similar 2022 Sierra 1500 vehicles. The defective component is currently still installed on the vehicle and available for inspection upon request. Due to the risk of detachment while driving, vehicle operation at highway speeds now presents a potential hazard to surrounding traffic.

On 2/23/26 my GMC sierra 1500 AT4 3.0L Inline-6 Turbo-Diesel, it auto stopped (which I will never keep on again) on an incline and would not start back up or shift gears and rolled a few feet. I had to turn it off and restart it, then the engine light came on and a notification about conditions not favorable for shifting? My app said service was needed for engine/transmission issue. I took it to the dealership and it now has to have the transmission control valve body assembly replaced. I did not receive a recall notice for my truck but, it seems to be the same issue that the recall was for on GM vehicles of the same time period. Of course the dealership said they have no loaner vehicles and I'm supposed to be without my truck for approx. a week and a half at this point. I am disappointed with GMC and the quality that I am paying $70k for. I had a 07' Silverado 2500 I purchased new and drove it for almost 15yrs. w/ no issues. Hopefully this is a good fix and it'll last but, from what I've seen, GM is not the quality it used to be. This is on top of being in the shop for a coolant control valve issue that wasn't recalled either but, a known issue on the pickups so beware. I did call GMC and they will reimburse up to $44 a day on a rental (has to be a GM vehicle btw) during this fiasco of course afterwards and with a bunch of paperwork but, I have to have a vehicle, in TX nothing is close by. Good luck everyone!

On Saturday at approximately 5:30 p.m., while driving on a two-lane city street with vehicles around me, my GMC Sierra began malfunctioning. The gauges flickered, warning lights appeared, and a transmission warning activated. As I attempted to safely pull over, the vehicle began stuttering and then completely stalled in the middle of traffic. Cars swerved and honked to avoid hitting me. Fortunately, no collision occurred, but the situation was extremely dangerous and frightening. AAA towed the vehicle to the GMC dealership. When I informed them of the incident, I received a text asking whether an over-the-air update had been performed prior to the stall. I confirmed the vehicle had received an update within the past three months. I was then told there is a bulletin stating that after an over-the-air update, the vehicle may suddenly lose communication with multiple modules and stall. The foreman indicated this was likely the cause and that they were consulting Technical Assistance. I asked when it is considered safe to drive a GMC vehicle following an update, as I was never warned that the vehicle could suddenly lose power and stall without notice. I was told they were investigating further. Yesterday, I was informed that engineering directed them to replace the ECM (Engine Control Module) and the Fuel Pump Control Module, with the ECM expected to arrive next Wednesday. I have not been given a confirmed timeline for completion. This appears to be a serious and known issue within GMC, yet there has been no recall and no warning provided to consumers. I was unknowingly driving a vehicle susceptible to sudden and complete power loss. This failure placed my life, my family, and the safety of others at significant risk.

Driving along a main road at 40-45 MPH and coasting toward a traffic light, the engine stalled out. Traffic light turned green and the vehicle would not accelerate. There were no warnings, check engine lights, or sounds. I could not pull to the shoulder due to traffic and had to pull into a left hand turn lane. The truck would not restart. Electrical systems seemed fine. Engine would turn over but not start on multiple attempts. One attempt finally got it to start but it immediately stalled. I was stuck in a dangerous situation at a busy intersection and no way to move the vehicle. It has been towed to the dealership.

Power steering randomly cuts out very random and intermittent. So far only done at low speeds but worried if turning in an intersection and i lose steering.

The contact owns a 2017 GMC Terrain. The contact stated that after the vehicle was taken to a local car wash, while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the residence; however, the next day, the vehicle hesitated while starting. The message "Stabilizer - Power to Engine Reduced" was displayed. The vehicle was taken to a local independent mechanic, where it was diagnosed, and it was determined that the engine possibly needed to be replaced because the engine failed to turn over. The vehicle was towed to a local dealer, where it was diagnosed, and it was determined that the engine was blown. The contact was informed that the engine and the starter needed to be replaced. The vehicle was not repaired due to the cost and remained with the local dealer. The manufacturer was made aware of the failure. The failure mileage was approximately 104,750. The VIN was not available.

I stopped at a red light in the middle of a 50 mph intersection when the light turned green The engine completely shut off, and it didn’t want to turn back on. I was stuck in the middle of the intersection in a very high risk area, putting myself and other drivers at risk. OnStar diagnostics didn’t report any issues with the truck. According to their diagnostics, everything should have been running perfectly fine. The motor shut down completely and we weren’t able to shift the truck into neutral in order to try to move out of harms way. There was no warning lights or anything before this happened. The first tow truck driver that came by was told that he was there “in order to do a jumpstart” He ran a diagnostic on both of the batteries and said that they were perfectly fine. Another tow truck had to be dispatched since the first wasn’t equipped to take the truck. In total we were stuck in the middle of the intersection for almost three hours. The amount of times we almost had someone crash into us during that time was very concerning. Dashboard and lights were all working perfectly fine. Auto start stop technology seems to have shut down the motor and was not able to get it to turn back on . This vehicle is a safety hazard.

The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at various speeds, the steering wheel became stiff and difficult to steer to the left or the right. The power steering and check engine warning lights were illuminated. The vehicle was towed to a local dealer, where it was diagnosed with a corroded body ground strap. The error codes were cleared, and a test drive was performed. The vehicle was repaired out of pocket. Upon further investigation, the contact related the failure to the GMC Customer Satisfaction Program: N252515590; however, the VIN was not included. The manufacturer was not made aware of the failure. The failure mileage was approximately 37,061.

The contact owns a 2025 GMC Sierra 1500. The contact stated that while the defroster was activated to clear the windshield, the blower vents on the passenger’s side started making an abnormal hissing sound, and air produced by the blower motor decreased and was inadequate to clear the windshield. There was no warning light illuminated. The contact stated that the failure occurred while there was light snow covering the hood and on the outside vents underneath the windshield. The contact had taken the vehicle to a local dealer several times, and the dealer was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 3,000.

Vehicle is shifting hard when switching gears. Typical with the recall and the valve body being the issue. Dealership is saying it is not covered by recall.