GMC Sierra Complaints (2025)

179 consumer complaints on file.

#11774468October 29, 2026
ENGINE
This is a follow up to my recent safety concern on my 2025 GMC Sierra 1500 with the 6.2 engine. Dropped off my vehicle to our GMC service dealer on 10/22/2026 - Oil change and 15K mile check up was getting close. Mileage at drop off was 14,278 and the engine was still making sounds/noise and getting louder. Asked the service advisor to check for metal in the oil or filter. Based on their service review and advisors response, metal was found in the oil filter and engine is ticking. Service department sent information to GM rep for further actions needed. Dealer rep stated that I need a new engine due to this new found issue. Waiting for response from a GM representative at this time. Truck is in my garage at home. I remain very concerned about driving this vehicle at this time. Just called the dealership as I have not heard of any follow up yet. Call went to voice mail of my service advisor. 6.2 Engine is ticking and metal has been found in the filter. Please add this to my original concern on this VIN #.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11774289October 28, 2026
ELECTRICAL SYSTEM, VEHICLE SPEED CONTROL, LANE DEPARTURE: ASSIST
Repeated failures on my 2025 GMC Sierra EV. The truck shows 'Service High Voltage Battery' and the high voltage battery makes a high-pitched hissing noise; it has thrown battery errors twice. The A/C has failed repeatedly; this summer a passenger in the truck overheated and suffered heat stroke because the A/C was not working. Super Cruise and other driver safety features consistently fail while driving. The GPS/telematics module has failed (GPS never finds a location). The truck was at Bob Howard GMC in Edmond, OK from [XXX] to [XXX] (repair order [XXX], 41 days) for the telematics module and A/C, and went back on [XXX] for the A/C and battery and is still in the shop. GM case number [XXX]. No crashes. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
1
Deaths:
0
#11772979October 22, 2026
ENGINE
Severe Engine Knock
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11772806October 21, 2026
ELECTRICAL SYSTEM, ENGINE, POWER TRAIN
The engine locked up and stalled out while driving. GM replaced engine but still experiencing issues. Dealer has admitted that they will likely recall my model year since it is an ongoing and same issues as recalled trucks. I have a vehicle I am not confident in nor safe it since it stalled while driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11772422October 20, 2026
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
Engine lost power and is smoking profusely. An independent service center told us there is a problem with one or more of the cylinders. No, there were no warning lamps. It's here, but we can't drive it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11772064October 19, 2026
ENGINE
In April 2025, we purchased a new GMC Denali Sierra 1500 Ultimate pickup truck. Concerns – Many of these comments appear in the Dealer Service Reports 1st Service Visit 10/17/25 At our first oil change and scheduled maintenance (10/17/25) with mileage of 5403 miles, during the drop-off I informed the GM Service Advisor of a clicking sound from the engine which I thought might be a fan belt. When I picked up the truck from Service, the Service Adviser informed me that upon startup, a “clatter” type noise was heard, “reminiscent of bad lifters.” The Service Adviser reported that during the mechanic’s test drive, the “clicking noise would get louder with engine speed.” No trouble codes were found after being checked by the MDI. They checked for misfires and a few misfires were found but “not often. At “idle” during this service call, the Left Engine Bank had a “good click/metallic tap to it.” “When the idle was raised, the Right Bank would get loud and had a loud tapping sound.” The oil change did not show any visible metal particles. The GM Service Department recommended a “complete tear-down of the engine for further inspection,” tentatively scheduled in a few weeks, pending Service availability. The Service Adviser stated he would recommend an engine replacement. 2nd Service Visit 10/27/2025 While driving the truck, I noticed that the engine “ticking” had gotten louder, and a Check Engine light had gone on and off. I returned to the Service Department on 10/27/25 (mileage 5807). The Service Department inspected the vehicle and found no “stored DCTS” but found “noise is there for internal engine noise.” The team recommended “tear-down or possible new engine.” Service appointment was set for 11/3/2025 for 5-days. 3rd Service Visit 11/3-7/2025 Service department reported that there were no problems. Vehicle was not under recall..... Scheduling a oil change this week. 14,500 miles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11771801October 17, 2026
ENGINE
Vehicle lost power. Pulled into parking lot steering wheel locked. Tried to restart truck nothing happened. Took to dealer they said motor needed to be replaced and it would take 4 to 6 weeks.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11771080October 14, 2026
EQUIPMENT:ELECTRICAL:INFOTAINMENT
The contact owns a 2025 GMC Sierra 1500. The contact stated that during vehicle startup, the infotainment system displayed a blank screen and produced no audio volume. The failure also occurred while driving. The contact associated the failure with Preliminary Information Bulletin: PIT6362, which addressed software-related infotainment and radio anomalies. The dealer was contacted. The manufacturer was notified of the failure by phone. The failure mileage was approximately 4,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11769463October 6, 2026
POWER TRAIN, UNKNOWN OR OTHER, FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
I was driving at 70 mph on the highway. I heard clunk and then rattling and saw smoke while losing power. Check 4wd warning illuminated. Came to stop in busy traffic and where I first parked on shoulder, saw shoulder of roadway smoking and on fire. I pulled forward 100 or so feet slowly while hearing more grinding rattling cranking. Came to stop. Fire dept arrived and extinguished roadside blaze. Called towtruck and had towed to [XXX] in [XXX]. 75k miles. No warning just catastrophic failure. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
Yes
Injuries:
0
Deaths:
0
#11769039October 5, 2026
STRUCTURE:BODY, WHEELS
At approximately 9,000 miles and 9 months of ownership, both front wheelhouse liners on my 2025 GMC Sierra 3500HD Denali Ultimate permanently deformed and sagged into the front tire clearance area. The truck is completely stock, including the factory wheels, tires, suspension, and ride height. No modifications have been made that would affect tire-to-wheelhouse clearance. The condition occurred during approximately four hours of highway towing at approximately 65 MPH while pulling a travel trailer weighing approximately 12,000 pounds. Ambient temperature was approximately 105 - 114°F and side winds were approximately 20 MPH. Both front wheelhouse liners became visibly deformed and sagged downward toward the tires. Both liners now contact the factory front tires during normal steering, particularly during tighter low-speed turns such as parking-lot maneuvers. On the driver's side, repeated tire contact has worn completely through the wheelhouse liner, leaving a hole and exposing components behind the liner. I temporarily tied the driver's-side liner back to reduce further tire contact, but because the liner has permanently lost its original molded shape, tire interference can still occur during tight turns. The passenger-side liner has not been tied back or otherwise modified and shows similar deformation and tire interference. There was no collision, road-debris impact, tire failure, or other known event that caused the damage. The vehicle was being operated normally and towing a load appropriate for a GMC Sierra 3500HD. I am reporting this as a potential safety defect because the factory wheelhouse liners have deformed sufficiently to contact rotating front tires on an unmodified vehicle. Continued contact could potentially damage a tire or surrounding components and may affect safe vehicle operation. Photographs document the deformation, tire-contact area, hole worn through the driver's-side liner, and similar deformation of the passenger-side liner.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11768518October 2, 2026
SERVICE BRAKES, ENGINE, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
ELECTRONIC BRAKING SYSTEM FAILURE. VEHICLE WAS PUT IN LIMP MODE WITH A TOP SPEED OF 62 MPH. VEHICLE HAD VERY LITTLE OR NO BRAKING . VEHICLE HAS LESS THAN 13,000 MILES . I AM THE ORIGINAL OWNER.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11768521October 2, 2026
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
The contact owned a 2025 GMC Sierra EV. While the contact’s husband was driving 69 MPH, the Super Cruise control feature became inoperable. The driver dozed off while operating the vehicle, and there was no audible alert to alert the contact. The contact stated that due to the failure, the vehicle traveled through an intersection, crossed over other lanes, and crashed into a guardrail. The air bags deployed during the crash. The contact sustained bruise on the arm and scratches in the crash. A Police report was filed. The vehicle was towed to a service center and was deemed a total loss by the insurance company. The contact stated that the super cruise feature should have alerted the driver. The contact stated that the vehicle failed to recognize the driver’s condition or intervene to prevent the crash by stopping the vehicle. The failure mileage was 9,800.
Crash:
Yes
Fire:
No
Injuries:
1
Deaths:
0
#11765436September 18, 2026
AIR BAGS, UNKNOWN OR OTHER
A driver hit me in the side of the car at around 70 mph to where it bent the frame of the truck and the airbags did not deploy causing a major issue and my daughters head to hit the side window.no warning lamps and it’s currently at a body shop right now
Crash:
Yes
Fire:
No
Injuries:
3
Deaths:
0
#11765437September 18, 2026
AIR BAGS, UNKNOWN OR OTHER
Air bags didn’t deploy after being hit so hard in the side it bent the frame and my daughters head head hit the side window
Crash:
Yes
Fire:
No
Injuries:
3
Deaths:
0
#11765016September 17, 2026
POWER TRAIN, ELECTRICAL SYSTEM, ENGINE
The contact owns a 2025 GMC Sierra 1500. The contact stated that while driving approximately 5 - 10 MPH, the vehicle went into LIMP Mode and failed to properly accelerate, and the transmission unexpectedly downshifted. There was an electrical malfunction, which caused the transmission to downshift. An unknown message was displayed on the instrument panel. The contact stated that the network was not operating at the correct voltage due to the wiring harness. The engine light illuminated after the failure. The vehicle was towed on two occasions to the dealer to attempt to duplicate the failure. The dealer was unable to determine how to repair the vehicle. The vehicle was driven to the dealer in LIMP Mode. The manufacturer, General Motors, was contacted by the dealer, and the contact also reported the failure to the manufacturer. A General Motors service engineer had inspected the vehicle. The failure mileage was approximately 34,637.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764636September 16, 2026
SERVICE BRAKES
Turned on vehicle and an alert popped up "Brake system control module malfunction", limited speed to 43 miles per hour, no power breaks worked. I have had no issues with brake system for the first 11k miles. I contacted my local GMC dealership (Banks Chevrolette in Concord, NH) and was told that I would not be able to get an appointment until the 2nd week of November. I told them this was a break system issue covered under warranty and they told me I was welcome to DRIVE to their dealership (14 mi away on INTERSTATES and CITY STREETS) and wait to see if there was any time to plug it in, but they would not guarantee there would be time on their end. I spoke with the service manager and was told the same and that his advice was to "not drive it until November". I was able to take the truck to a shop in town 2 mi away , and they printed off the following codes: P25A U160F U1610 U2418 U2419
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764349September 15, 2026
LANE DEPARTURE: WARNING
Super cruise was engaged on I-95 and attempted a lane change. Another vehicle was in a position along side my vehicle that would have resulted in an accident if I had not noticed it and manually grabbed the steering wheel to override the super cruise. I have an appt with the dealer next week. The vehicle is also is occasionally displaying a "service driver assistance system" message
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11763693September 11, 2026
SERVICE BRAKES
I was driving in town when all lights on the dash lit up, and I mean all of them. I was approaching a traffic light in low traffic in the 20-30mpg range. I went to apply the brakes and almost had none. If I was going to estimate how much braking was available, it would be in the 10% range. I drove at 20mph to the nearest dealer. They verified the issues. They reflashed the computer, drove the truck afterwards, and pumped the brakes. They told me they recommended an immediate master cylinder replacement. They had seen this twice already in the month of August. Both times prior to mine the reflash initially worked, but the problem returned within a week, and the master cylinders had to be replaced. The master cylinder replacement was a $2600 repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11763207September 9, 2026
ELECTRICAL SYSTEM, ENGINE
When updating the vehicle as prompted by the entrainment system the next day when attempting to start the vehicle it did not start. Vehicle had to be jumped then 6 warning lights came on and disappeared shortly after driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11762694September 8, 2026
ENGINE
On XXX my 2025 gmc sierra 6.2L v8 engine experience catastrophic engine failure with no preexisting alerts or warnings. It was towed to Baglier gmc in [XXX] on XXX and is currently awaiting diagnostic evaluation. Upon restarting the vehicle after failure, the engine light did turn on. 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

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