GMC Complaints

We own a 2016 GMC Yukon XLT Denali with the GM 6.2 engine. On Saturday, July 26, 2025 our vehicle suddenly lost power and became undrivable in traffic. We had it towed to our GM dealership who still has the vehicle (Reiselman GMC- Springfield, TN) They called today and said the engine could not be repaired. They stated it had no compression in Cylinder 8. The said our only option was a new engine. THIS IS THE SECOND CATASTROPHIC FAILURE we have had. In November 2021 we experienced another CATASTROPHIC FAILURE when the vehicle suddenly lost power. The engine required a valve and valve spring and seal on cylinder #1. This is 2 major failures we have had which could have been dangerous had we not been able to get out of traffic. The vehicle currently has 116k miles. These types of major failures in a vehicle that has been serviced according to schedules and receives only typical local and commuter use is out of the norm. It is the first generation of GM's 6.2L engine and the sister engine to the one currently under major recall and no-sell orders. We believe that GM knows of these issues as we have spoken with other people who have had similar problems. The problems involve the valve train and the crank and pistons much like the recall on the later models. Please advise what we need to do to move our complaint through the system to see if we can get some relief on this matter. The dealer still has the vehicle so we don't have any paperwork yet on the latest incident. I will send the November 2021 information

I'm reaching out for urgent help regarding my 2024 GMC AT4, which is currently at Newby Buick GMC in St. George, Utah, with a transmission failure that occurred on Saturday, [XXX]. While returning from a horse show in Ogden, Utah, the truck began to experience severe transmission issues near Santaquin, Utah, around 5:30 p.m. Just before reaching Santaquin, the truck jerked violently three times-so hard that I immediately checked the camera system inside my horse trailer to make sure one of my horses hadn't gone down. That's how intense the jolt was. I pulled into a gas station in Santaquin and called the dealership right away. At the time, I had three horses on board, it was nearly 100 degrees, and I was hauling a large living quarters horse trailer. The service manager was initially unavailable, but he returned my call shortly and advised me to continue driving to St. George at a steady speed if the truck could manage it. He also warned that it might go into limp mode, and in that case, I'd just be traveling very slowly. My husband was on standby in case he needed to meet me halfway, but I was hopeful that I could make it to at least Hurricane, Utah. I was able to access my GMC app on my phone at the time and confirmed to him that the transmission check light was on, and I was receiving a warning notification on the app indicating there was a transmission issue. I was able to limp the truck as far as Hurricane, where my husband met me. We unloaded the horses into stalls and took both trucks into St. George that night to drop the AT4 off at the dealership. On Monday morning, I contacted the dealership for an update and was informed that the issue was likely related to the transmission valve, and that the required part is on national back order-with an estimated delay of two months or more, but no confirmed ETA. This has been my first GMC diesel. I've always driven Dodge trucks. Over a year ago, I saw the new color GMC released and kept telling my husband how amazi INFORMATION REDACTED PURSUANT TO THE FREEDOM O

Power Steering failure. Loss of power steering while driving the vehicle made any turns nearly impossible. Dealership identified root cause and a problem with a grounding strap. They reported that in addition to our vehicle, another GMC Sierra 1500 had come in the same day with the same problem. Loss of power steering while driving can lead to collision. This should be a safety recall.

Vehicle: 2021 GMC Yukon XL VIN: [XXX] Recall ID: 25V274 (GM Recall N25249400) Mileage: Approx. 35,000 My 2021 GMC Yukon XL was recalled for a potential engine defect. On June 9, 2025, the dealership (Carol Buick GMC in Florida) determined that my vehicle was unsafe to drive and that the engine needed to be replaced under GM Recall N25249400. GM has not delivered a timely fix. The engine remains on national backorder, and as of July 31, 2025, the vehicle has been out of service for over 6 weeks. I was provided a loaner vehicle, but my own vehicle remains undrivable, and no repair ETA has been provided. GM opened two internal case numbers (#[XXX] and #[XXX]), but despite repeated follow-ups, I have received no estimated return date or formal remedy timeline. I believe this delay violates the federal requirement to provide a timely recall remedy under NHTSA regulations, and I am requesting an investigation or compliance review of GM's handling of this recall. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Last week, the coolant gauge , on our 2019 GMC Acadia, was reading below "C".... The "Steering Assist" warning was disabled on the on-screen display and the Air conditioning stopped working. Took the car to a mechanic, who read the codes.... Mechanic stated that all symptoms were based on a defective GM thermostat. The thermostat was "stuck-open" causing the "steering assist" to be disabled as well as the A/C from being disabled as well. It seems GM has updated the part since when the series of Acadia were manufactured. After getting it repaired, at of our pockets, we researched and noticed that thousands of other GM Acadia owners had the same exact 3 symptoms: (1) malfunctioning coolant reading (2) "Steering assist" disabled (3) a defective ("stuck-open") thermostat..... Symptoms were exactly the same for all parties involved. We have owned many vehicles never had a thermostat fail before 65k Miles.... It became a safety issue since the car disables the "steering assist" based on the thermostat being stuck open. Contacted GM corporate which stated unless a recall, there would be no compensation. GM needs to make it right for the thousands of GM owners whose car has the 3.6L engine In short, this is a major issue since the car's steering system is NOT working correctly We would like a recall to be initiated. Thank you.

The contact owns a 2018 GMC Acadia. The contact stated that upon shifting to park(P), the message "Shift to Park(P)" was displayed intermittently, and the vehicle failed to turn off. The contact stated that the vehicle was taken to a dealer, where it was repaired; however, the failure recurred. The vehicle was taken back to the same dealer, where it was diagnosed that the shifter module needed to be replaced. The vehicle was repaired; however, the failure persisted. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was 129,573.

Vehicle's "SHIFT TO PARK" warning is often displayed when vehicle shifter is in PARK and then the engine is turned off. Often takes several attempts to correct the problem by restarting and turning off the engine or by manipulating the shift lever while in PARK. These is a current recall for this issue with the same year, make, and model of vehicle. Checking the VIN against the NTSB recall list shows this vehicle is not included in the recall.

Had to have transmission rebuilt found metal shavings and was shifting bad and shuttering. Vehicle Has 63,000 miles and is well maintained. Vehicle was taken to GMC but said their transmission person was on vacation for 2 weeks. Also parts dept Said they had no transmissions in stock and were back ordered. Truck was taken to AAMco and transmission was rebuilt And torque converter replaced . This is a common issue with GMC trucks.

The contact owns a 2018 GMC Acadia. The contact stated that while parking the vehicle, the gear shifter was shifted into park(P), but the “Shift to Park” message was displayed. The vehicle made an audible chime. The contact shifted the gear shifter back and forth, then shifted into park(P) before the proper gear was recognized. The vehicle was taken to an independent mechanic; however, the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 107,000.

New 2025 GMC Acadia Denali vehicle with only 5,600 miles driven. When starting SUV I pressed start button and brake pedal. I felt the brake pedal pulse down. Once started, the dashboard lit up with warnings of Service ESC and Service Brake Assist. Quickly took to dealer, they ran diagnostic tests and revealed the Master Brake Cylinder is out. Dealer said I should Not drive it due to danger of brakes completely failing! Dealer has other 2025 Acadia's come in with no brakes at all due to same issue and they are still there waiting on same part. Dealer and GM have NO estimate of when they will have a new Master Brake Cylinder as this part is on back order. A case has been created with GM regarding part availability delay. My research has revealed numerous owners of 2025 Acadia, Traverse and Enclave with this same Master Brake Cylinder failure and no parts available waiting months. Brake failure is a MAJOR SAFETY hazard! GM has stopped selling the 2026 Acadia, Traverse and Enclave. They should recall all 2025 Acadia, Traverse and Enclave!