GMC Acadia Complaints

5,595 consumer complaints on file.

#11766232September 22, 2026
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING, ENGINE
Today, on [XXX] outside of Sapulpa Oklahoma, while in the inside lane of three southbound lanes, cruise control on at 80mph. The car suddenly reduced power, air conditioning stopped, assisted power brakes stopped working, gauge cluster full of flashing warnings. Pulled to the right shoulder, stopped with difficulty. Had to pump and stand on brakes to get stopped. Shut off engine, then restated and everything stated working again. Scary situation in heavy traffic. Lucky to be alive!! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11766184September 22, 2026
STEERING
Bad thermostat causing power steering to go out and lose AC.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11765790September 21, 2026
ENGINE
Engine thermostat not functioning properly, opening too early and not allowing engine to operate at proper engine temperature. Check engine light comes on, reduce power steering assist error message comes on, engine temperature gauge reads cold when vehicle has been running for an extended period of time. This is a known problem by GM and there is a recall for this issue on many of these vehicles, other GMC and Cadillac vehicles. Our vehicle should be added to the recall list.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11765876September 21, 2026
POWER TRAIN, ENGINE
2020 GMC Acadia bucks/hesitates when I take off or slow down and speed back up. Mechanic looked at it can see engine is having random misfires. We have tried plugs, transmission fluid, looked at everything we could think of. The condition improves if I put into AWD but still exists and worsens for a period of time after it shifts back into FWD mode. My mechanic has done a lot of research and found that one possible issue was a stretched timing chain but since it is out of warranty I just couldn't afford to have them tear it down it is an enormous job to see if that was the issue. It also lines up with other known issues like the auto stop issues and possibly a fuel pump issue. I have seen many people complaining online about this particular issue but not many on here and no recalls on my vehicle regarding the known issues
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11765882September 21, 2026
SERVICE BRAKES, UNKNOWN OR OTHER
While driving my 2025 GMC Acadia, the vehicle experienced a sudden and severe failure of the brake master cylinder assembly, causing a significant loss of hydraulic pressure and braking assistance. Multiple dashboard warnings illuminated simultaneously, including ABS and brake system alerts. The brake pedal feel altered abruptly, drastically increasing the required stopping distance and creating an immediate collision hazard. The vehicle is currently grounded at a certified GM dealership awaiting a total replacement of the defective master cylinder assembly under factory warranty. Mileage at the time of failure was 19,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11765902September 21, 2026
BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING
The rear camera does not operate 100% of the time. This has happened multiple times over the year.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11765941September 21, 2026
ELECTRICAL SYSTEM
Receive error message about Power steering that shuts off AC and Temperature gauges. Happens constantly when vehicle is driven on freeway. Requires the battery to be disconnected and it resets until the next time.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11765708September 20, 2026
UNKNOWN OR OTHER
Urgent code going off due to thermostat not being red gauge is stuck
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11765518September 19, 2026
ELECTRICAL SYSTEM, POWER TRAIN
While attempting to turn vehicle off, the message shift to park was given. Could not shut vehicle off! Has happened multiple times in the past, then disappears for awhile. Comes back again at will. Have seen multiple complaints on this issue falling back to a defective micro-switch within the shifter assym. Former GM tech here---
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11765267September 18, 2026
ENGINE
I own a 2019 GMC Acadia equipped with the 3.6L V6 engine. VIN. See form above In 2025, the engine coolant thermostat failed on my vehicle and required replacement at my expense. I am submitting this complaint because I believe this may represent a recurring component problem affecting 2019 GMC Acadia vehicles and I would like NHTSA to determine whether the condition presents an unreasonable risk to motor vehicle safety. General Motors has published service information addressing thermostat-related conditions on GMC Acadia vehicles equipped with the 3.6L engine. GM has also issued special coverage for an engine coolant thermostat condition on certain GM vehicles. GM’s special coverage describes a thermostat that can open at a lower temperature than intended, resulting in a malfunction indicator/check-engine light and diagnostic trouble code, and in some cases causing the engine cooling fans to continue running after the vehicle is shut off. My 2019 Acadia uses the 3.6L engine and the thermostat assembly addressed in GM’s service information. Despite this, my 2019 model year is not included in the current extended thermostat coverage. There is also a second, independent occurrence involving the same model year. My father owns a separate 2019 GMC Acadia, and the thermostat on his vehicle also required replacement in 2026. These are two separate vehicles that experienced thermostat failures requiring replacement. I understand that a thermostat failure is not necessarily a safety defect by itself. However, I am concerned that a recurring failure of this component could potentially create a safety risk depending on the failure mode and resulting vehicle condition. I am therefore asking NHTSA to review the available consumer complaints, manufacturer service information, warranty data, and GM special-coverage actions to determine whether there is a safety-related defect affecting 2019 GMC Acadia vehicles equipped with the 3.6L engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764946September 17, 2026
STEERING
The contact owns a 2024 GMC Acadia. The contact stated that after an oil change, while starting the vehicle, the steering wheel became inoperable. The contact became aware that the top of the steering wheel was cracked and had popped out of place. The contact stated that while driving, the failure caused a cut on the hand. The vehicle was taken to the dealer, where the failure was confirmed. The contact was informed that the steering wheel needed to be replaced. The dealer referred the contact to the manufacturer for assistance, and a case was opened. The contact believed the failure might be related to the leather on the steering wheel, which had deteriorated due the changes in the weather. The contact was concerned that the damaged steering wheel posed a safety risk while operating the vehicle. The failure mileage was approximately 47,000
Crash:
No
Fire:
No
Injuries:
1
Deaths:
0
#11765052September 17, 2026
SERVICE BRAKES
When backing into my driveway the brakes failed. I was nosing the car across the street towards the neighbors driveway so I could put the car in reverse and back it into the driveway. I applied the brakes while traveling at about 3-4mph when the brakes had little resistance and went straight to the floor and the vehicle continued moving forward. Attempted to apply brakes again and the same result. Ended up hitting the neighbors parked car in their driveway. Luckily it was a very low rate of speed so there was minimal damage and nobody was hurt. There were no warning lights present before, during, or after the incident. The vehicle got towed to a local GMC dealership who could not replicate the issue. Insurance is still looking into the issue.
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0
#11765053September 17, 2026
SERVICE BRAKES
When backing into my driveway the brakes failed. I was nosing the car across the street towards the neighbors driveway so I could put the car in reverse and back it into the driveway. I applied the brakes while traveling at about 3-4mph when the brakes had little resistance and went straight to the floor and the vehicle continued moving forward. Attempted to apply brakes again and the same result. Ended up hitting the neighbors parked car in their driveway. Luckily it was a very low rate of speed so there was minimal damage and nobody was hurt. There were no warning lights present before, during, or after the incident. The vehicle got towed to a local GMC dealership who could not replicate the issue. Insurance is still looking into the issue.
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0
#11764416September 15, 2026
FUEL/PROPULSION SYSTEM
The car abruptly died in motion. Backing up it died and locked itself in park. I had no way to move it out of the road. There were no warning lights nor did the car stutter or seem any different. I was also nightime making me invisible to other drivers. There was no way to shift the car from park to neutral to get it out of the road. After the incident Onstar sent an email with an error code P023F. The fuel module. I realized the 2021-2022 were under recall but not the 2023 i have. I purchased my 2023 in 2022 it likley was fitted with same modules that were under recall. I loved this car but that was such a frigntening ordeal I will no longer have it nor will i Purchase a GM product. I was told by the dealer sales manager that it wasn't under warranty and roadside assistance would not cover towing nor would the dealer cover repair. I reach out to another dealer and got a totally different answer. They fixed it but could not gurantee or actually even be convincing that it was a fix. I wan't other owners to be more aware of this issue to avoid tragedy. I do realize things tear up. But, this was totally preventable knowing the issue was never corrected.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764429September 15, 2026
FUEL SYSTEM, GASOLINE
The contact owns a 2019 GMC Acadia. The contact stated that the fuel gauge displayed an inaccurate fuel level. The fuel sending unit was replaced twice; however, the failure persisted. The contact became aware of the recurring failure while refueling the vehicle and noticing that the vehicle consumed more fuel than the fuel gauge indicated. The vehicle was taken to the dealer, where it was determined that the fuel sending unit needed to be disassembled for further diagnostic testing. The manufacturer was notified of the failure by phone. The failure mileage was 64,382.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764000September 14, 2026
STEERING, ENGINE
I am submitting this complaint to request that NHTSA investigate a potential safety defect involving the engine coolant temperature monitoring system, thermostat/engine coolant temperature sensor system, and its relationship to reduced steering assist in 2019 GMC Acadia vehicles. My 2019 GMC Acadia, currently at approximately 91,500 miles, has experienced the following symptoms: • The engine temperature gauge remains flat or reads abnormally low/cold. • The cooling fans run continuously at extremely high speed, creating a loud "screaming" fan noise. • The vehicle displays the warning message "Steering Assist is Reduced — Drive with Care." • The vehicle has a history of diagnostic trouble code P0128, "Engine Coolant Temperature Below Thermostat Regulating Temperature." I am concerned that these symptoms are related and represent a potential safety defect rather than an isolated thermostat or cooling-system repair. GM has issued bulletin PIT5967, "Service Steering Message With P0128," which applies to GMC Acadia vehicles from model years 2017 through 2023. The bulletin states that when P0128 is present, the ECM may be reading coolant temperature incorrectly and that a "Service Steering Message" may be displayed to protect the steering gear in the event of an undetected overheating condition. GM instructs technicians to diagnose and repair P0128 first. GM bulletin 17-NA-158 also describes a relationship between P0128, an invalid coolant-temperature signal, and the "Steering Assist Reduced, Drive With Care" warning. The bulletin explains that the steering module relies on valid coolant-temperature information to provide additional steering assistance under cold conditions. Also will not register when put in park. Getting error message "shift to park" take multiple restarts of the vehicle and shifting gear back and forth for it to register.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764031September 14, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
While driving home from work the car displayed a "No Fuel" warning, despite having a full tank of gas. Within seconds of the display showing the car stalled out and stopped right in the middle of the road. It would not go into neutral and I had to be towed from the middle of the road to a mechanic close by. Upon reading forums online it looks like this is a known and common issue affecting the fuel pump sensor and system in these models. There are no open recalls but being this is known and happens so often I am shocked GMC has not taken ownership to recall and correct this issue. If I had not been on a slower road I could have gotten into an accident and, as I said, the car would not go in neutral so I couldn't even safely get off the road.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764105September 14, 2026
ELECTRICAL SYSTEM, VISIBILITY/WIPER
What failed & is it available? The infotainment/radio module failed entirely due to an OTA software update (Codes: U18B4, U0184, B1325). The vehicle and component are fully available for inspection upon request. How was safety at risk? The federally mandated backup camera is now too faint/dim to read, destroying rearview visibility. Bluetooth/hands-free phone pairing is completely disabled, increasing driver distraction risks and preventing compliance with hands-free driving laws. Is it confirmed by a dealer? Yes. A local GMC dealership inspected the vehicle and confirmed the module is bricked, quoting $2,286.00 for a hardware replacement. Inspected by manufacturer/others? It has been inspected and confirmed by the local GMC dealer network, but GM corporate has refused to physically inspect or resolve it. Prior symptoms? No prior warning lamps or symptoms occurred. The system functioned perfectly until it instantly crashed during the remote update on August 10, 2026, at 9:00 PM.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11763610September 11, 2026
ENGINE
The car will frequently but not always fail to shut off when the start/stop button is pushed while in Park. The message "shift to park" come up on the display and a yellow light comes on in the button. I have to restart the engine and it often takes as many as 10 attempts to finally shut off the engine. Between each attempt I have to shift the transmission out of park and back into park. This has been happening for more than a month.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11763308September 10, 2026
AIR BAGS
On 9/08/2026 I was driving and almost got a wreck but I was able to get out and was going less the 25 and lost control of the vehicle and barely hit the curb and the two air bags went off and I was sent to the hospital
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0

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