GMC Complaints

Wipers stopped working an it’s not showing an active recall but research shows this model does have wiper blade motor recalls

While driving at approximately 60 mph on an open road with no obstacles present and no braking input, the rear wheels spontaneously locked up without warning. No brake pedal input. No warning light prior to the event. No obstruction in the road. The vehicle has been subject to an active manufacturer recall for rear wheel lockup due to transmission control valve failure. The dealer's own diagnostic system generated a report showing six active fault codes in the following days including lost communication with the Brake System Control Module and Transmission Control Module. These codes were not addressed on the repair order. The dealer attributed the lockup to an Automatic Emergency Braking activation without diagnostic confirmation and performed no repair. The manufacturer's own internal bulletin dated January 22, 2026 acknowledges the exact fault codes present on this vehicle as a known defect. The dealer cited this bulletin to dismiss the concern while stating no problems exist. A persistent brake noise has been confirmed by two separate authorized dealers across three visits with no repair performed at any visit. The vehicle has required five dealer visits in 77 days of ownership with 1,729 miles. The defect remains unresolved and poses serious risk of loss of vehicle control at highway speed.

While driving my vehicle the vehicle early in the morning going to work, the headlights went out. I pulled over, and turned it to auto and they worked there, but did not work when switching it to headlamps. That happened just the one time. Also, since I have owned the vehicle, after operating the vehicle when it is dark outside, and then getting out to get gas, and getting back in. I crank the vehicle over, and I have no dash lights. I cannot see how fast I am going. It only does this after operating the vehicle and turning it off, and then getting back in and starting it again. This has occurred many times for the past 4 years.

My truck has been exhibiting hard downshifting at certain speeds, when the powertrain loads up such as a grade change, and requires a downshift. I have complained about this issue to the dealership as early as 2022, and 33,185 miles. The dealership made me pay for a transmission $388.90 flush which did not resolve the issue. The problem has become progressively worse, to the point where the toll road transponder fell of my windshield during a recent harsh downshifting incident. At the same time there was an existing MIL and derating for a DEF heater and NOx sensor failure, so during a warranty visit I asked that this transmission issue be addressed. On Friday March 13, the dealership called and said they confirmed the hard downshifting, albeit not as extreme as I described. The technician said that the valvebody needs to be replaced. At the same time, they performed a TCM flash for the 10L1000 momentary wheel lockup recall. The dealership then said they could not get the truck to set a P0747 code, said that GM refuses to replace the faulty valve body, and recommended I take the vehicle home unrepaired, and to come back when the P0747 code is set. I requested they continue to drive the vehicle. Today March 20 the dealership called and said they could not get the code to set, and that I need to drive the truck and come back when the code appears, despite the truck exhibiting clear symptoms of a progressively wearing feed limit low valve. N242454441 does NOT seem to indicate a P0747 code is required to replace the valve body. This vehicle is not safe for towing a 20,000+lbs and GMC is refusing to repair a transmission with symptoms congruent with N242454441. The dealership still has possession of the vehicle and wants $360+ in diagnostic labor.

Vehicle battery dies and dealer cannot source issue. Voltmeter shows large fluctuations in voltage while vehicle is running and driving.

My Truck Was 123369 Milles Was Driving And Stop At My Work Turn Off The Vehicle and After That Re-Start The Vehicle And The Vehicle Not Start The Check Engine Light Coming on Im Tow The Tuck To The Dealer Were I Do All My Service They Check The Truck After A Mont And They Told Me The Engine Timing Off Due To Camshaft Gear Spun On Camshaf Which Sheared Locator Pin Valve Timing Off So That Enging Does Not Build Compression In Any Cylinder Recommende Enging Replacement Due To Nature Of Failure-Extensive Mechanical Damge Internaly To The Camshatf And The Warranty Was Over

The contact owns a 2021 GMC Yukon. The contact stated that while driving at various speeds, the vehicle shuddered abnormally with blue smoke coming from the exhaust, with the message "Lane Departure Assist" displayed. The check engine and stabili-trak warning lights were illuminated. The vehicle was taken to a local service center, where it was diagnosed with cylinder #1 misfire. The local dealer was contacted. The vehicle was not diagnosed or repaired. Upon further investigation, the contact related the failure to the GMC Service Bulletin:15-06-01-002L. The manufacturer was made aware of the failure. The failure mileage was approximately 110,000.

The contact owns a 2021 GMC Acadia. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. In addition, the coolant fan was running after the engine was turned off. The vehicle was taken to Auto Zone to be diagnosed due to the check engine warning light being illuminated. The contact was informed that DTC: P1098; was retrieved, which indicated a fault with the coolant control valve. The vehicle was taken to the dealer, where it was confirmed that the coolant control valve had failed. The vehicle remained at the dealer unrepaired. The contact related the failure to the Manufacturer Recall Number: N252508341. However, the VIN was not included in the recall. The manufacturer was made aware of the failure and advised that the VIN was not under recall. The failure mileage was approximately 69,000.

The DEF tank in my truck is defective and its the second time in the last 14 months it has broke. The part is now back ordered and according to the dealership this is a nationwide issue regarding these specific trucks. I have contacted around 10 dealers in my area and all tell me the same thing that they have multiple trucks waiting on the same issue. I have not had my truck for over 2 months and have no idea when i will be getting it back due to dealership having no idea when the part will be released due to the back order. This seems to a huge issue with these trucks and GM is doing nothing to help resolve it. I've reached out to GM directly and get no assistance and now have made 2 payments on my truck and the dealership refuses to give me a loaner vehicle. i am looking for some help or relief on what to do to go about my issue

Truck broke down with a rear-wheel lockup and had the transmission replaced in June 2025. In December 2025 and February 2026, truck lost power two times and entered limp mode while on a major highway and major interstate. The problem was misdiagnosed in June 2025, diagnosed properly in December 2025, but not properly repaired, and diagnosed properly in February 2026. All three times the vehicle had this issue, two of the same exact DTCs were present. This is a safety defect, and I have lost all confidence that the vehicle is reliable enough and safe enough for myself and my family.