GMC Complaints

On XXX at approximately 3:00 p.m., I was driving on the highway in [XXX], at approximately 65 mph when my truck suddenly displayed a warning stating that all oil pressure had been lost and that the engine needed to be shut off immediately. Within roughly seven seconds of seeing and comprehending the warning, I attempted to safely shut down the engine. Before I could do so, the engine seized while the truck was still traveling at highway speed.The engine failure caused an immediate loss of power steering and power-assisted braking, leaving me with limited control as the truck coasted at highway speed. This was an extremely dangerous situation that could have resulted in a serious accident, injury, or loss of life. The truck was towed to a repair facility, where technicians confirmed that the engine had seized and recommended replacing the long block. A new GM Genuine Parts engine was installed, and the repairs were completed on XXX. Today, XXX, the replacement engine has approximately 40,000 miles on it. I recently began hearing a ticking noise followed by knocking, and the engine nearly stalled while idling. I immediately checked the oil and confirmed that oil was present on the dipstick. I have consistently maintained the vehicle and completed every oil change at intervals of 5,000 miles or fewer. I returned the truck to the same repair facility that installed the replacement engine and was immediately informed that the truck requires yet another engine replacement. This is now the second 6.2L L87 engine that has failed in this vehicle. Two catastrophic engine failures—one involving a replacement GM Genuine Parts engine after only approximately 40,000 miles—are completely unacceptable. The first failure created a severe highway safety hazard, and the failure of the replacement engine raises serious concerns about the reliability and safety of these engines. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2012 GMC Sierra 2500 equipped with Armstrong Tires, Tire Line: Tru Trac HT, Tire Size: 245/75/17, DOT Number: 1E6DAE022625. The contact stated that the vehicle was taken to an independent mechanic for a routine tire rotation but was informed there were massive bubbles on the tires, and on one tire, there was a bulge the size of an apple on the sidewall of the tire. The contact replaced the tires. The local dealer was not contacted. The manufacturer was contacted and declined to accept the mileage claim and requested photos of the tires. The tire failure mileage was approximately 27,000. The vehicle failure mileage was approximately 146,500.

My 2023 GMC Sierra 1500 SLT 4WD currently at 67659 miles was taken in to the dealer because of excessive jerk when accelerating or trying to reverse, diagnostic scan failed for check engine and ABS trouble codes. The scan return code PO747 indicating transmission pressure control solenoid “A” was stuck on for a predetermined period of time. The recommended repair is replacement of automatic transmission, solenoid control valve body. I’m aware that GM has issued a TSB 25–NA-255 and special coverage N24245441–02 addressing this exact failure on the GM 10 speed and that GM previously issued a related recall N242454440 addressing this exact failure on the GM 10 speed transmissions, and that GM previously issued a related recall for this citing rear wheel lock up risk associated with transmission valve condition. My vehicle scan showed an ABS failure at the same time as a transmission. code, consistent with the safety risk. GM has already acknowledged and its own recall documentation however I was told to contact NHTSA to document the safety risk and request investigation of the scope of this defect across affected models years and vehicles as mine seems to have fallen short. I previously owned a 2021GMC vehicle same model that experience the identical transmission valve body failure that vehicle could not be repaired in a reasonable time and I ultimately experience financial loss and had to replace a vehicle now I’m experiencing the same defect on the vehicle purchased (this one) with significantly fewer miles than would be expected for a major transmission failure, indicating that this may be a reoccurring manufacturing design defect rather than an isolated incident. Thank you for your time and I hope this issue can be resolved as I do love the truck otherwise however safety first. Thank you

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle jerked and pulled to the right. No warning lights were illuminated. In addition, the contact stated that while driving over a bump in the road, the vehicle lost automotive power and shut off. The contact restarted the vehicle. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 230,000.

The GMC Sierra has a known issue from the manufacturer in which the power sliding rear window can start to leak water into the cab of the truck during rain or other impact with outside water. This issue allows water into the cab through a cracked or faulty seal, which impacts visibility and allows water to penetrate inside, producing risk for moisture to collect on the back window and potentially cause mold to grow inside, further creating a health risk. Further, the water intrusion can lead to interior damage, as well as potentially cause electrical failure and unsafe operation. This is a known issue dating back to January 2019 when GM issued Technical Service Bulletin 18-NA-383 and has continued to be revised since. The component has been reviewed and inspected by the dealer and is known to the manufacturer; however, they are unwilling to fix without cost as this is not a recall.

While driving, I suddenly smelled something burning. Immediately after, a warning popped up stating 'Engine power is reducing,' the check engine light came on, and I experienced a sudden, near-total loss of power braking assist, making the brake pedal extremely hard to press. I had to use intense force to bring the vehicle to a stop. A scan of the vehicle's OBD-II codes revealed codes P0556 (Brake Booster Pressure Sensor Circuit), P0014 (Exhaust Camshaft Position Timing Over-Advanced), and P0017 (Crankshaft Position - Camshaft Position Correlation). This is a known failure where the engine-driven mechanical brake vacuum pump seizes up, destroys the braking vacuum assist, and bends or shifts the exhaust camshaft reluctor wheel, causing a severe and immediate safety hazard while in motion.

The upper grille trim piece came off while driving down I20 between Hudson Oaks and Willow Park. I was doing between 60-65 mph. It could’ve hit other vehicles behind me, or to the side of me. This piece is a known issue and the 2022’s have a recall but not the 2023 model years. No signs of this being about to break.

As I was driving, the vehicle's air conditioning suddenly began blowing warm/hot air. Moments later, the check engine light and all electronic service stability lights illuminated on the dashboard. Simultaneously, the vehicle suffered a complete loss of electronic brake assist, resulting in an extremely hard brake pedal and a severe reduction in braking power. The vehicle also displayed a "No Drive Mode Available" message. Third-party diagnostic scanning revealed network power codes U3018, U3505, P00FF, and P0700, indicating a total loss of power to the Body Control Module (BCM). This is the second life-threatening incident with this vehicle I have experienced following a previous highway engine stall due to engine recall. The vehicle was towed to a GM dealership for diagnostic and emergency electrical repairs.

The car’s brakes hardened on the highway, posing a life-threatening danger, right before the engine died. Following a tow to the dealership’s service center, an initial inspection revealed a broken vacuum pump and broken camshaft. The dealership stated that there was evidence that camshaft debris may be scattered throughout the engine. No further inspection has been done at this time due to the probability of major engine damage and/or potential repairs.

On XXX at 1:56pm, I took the vehicle to Jiffy Lube service center #810 for the "Quick Oil Change Service" which includes checking and filling the Tranmission/Axle fluid. Per the attached receipt the Transmission/Axle fluid was "OK", and the next service was recommended after 5,000 addtional miles from the then current mileage of 153,317. On the morning o XXX, the car began experiencing issues identical to vehicle recall NHTSA ID Number: 20V668000. The check engine light turned on and the vehicle could maintain proper propulsion. On XXX at 3:25pm EST, I took the vehicle to AutoZone store #01664, whose "FixFinder" computer diagnostic inicated code PO700 "Transmission Control Module Requested MIL Illumination". On XXX, I had the car towed to a private mechanic who inspected the Vehicle and indicated that the transmission had "no fluid" despite having the fluids verified by Jiffy Lube on XXX. The mechanic suggested there may be a GMC service issue that required GMC remediation to due faulty internals which resulted in the transmission fluid leakage and subsequent triggering of the transmission computer module and related propulsion failure. As of today XXX, the vehicle is experiencing the same condition as indicated in vehicle recall NHTSA ID Number: 20V668000, which is creating additonal risk of vehicular accident/crash and vehicle fire in the presence of the ignition source. The milage is now 155,520. I am requesting this vehicle be serviced as part of recall NHTSA ID Number: 20V668000, you can verify from the vehicle registration from the Divison of Motor Vehicles and via CarFax that I purchased this vehicle used, the vehiclee has at least 1 (maybe 2) prior owners. I am requesting the vehicle (VIN [XXX]) receive the mandated recall service which will resolve the afformentioned issues and remove the related risks for myself, my passengers and all other motorists who are sharing the road. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)