GMC Sierra Complaints

15,732 consumer complaints on file.

#11708618January 4, 2026
ENGINE
2021 gmc purchased brand new Truck had complete engine failure lifters and rods were replaced at 7000 miles under factory warranty lost complete engine power GMC says we are not on any recall and they refused to buy back the truck or give me an extended warranty they said this year 2021 with 5.3 doesn’t have engine issues.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708622January 4, 2026
ENGINE
I had to get the cam and lifters replaced in the engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708646January 4, 2026
SERVICE BRAKES
Break system failed while driving. Multiple warning lights came on including Break System Failire, Service Steering Column Lock, Service Traction Control, Service ESC and Service Brake Pad Monitor. This happened as I was driving and I could barely stop the truck. I had my wife and kids in the car. Luckily, I was not driving very fast and was not in a congested or had to stop quickly. If I had to stop fast or was in a congested area this could have causes a life threatening accident.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708584January 3, 2026
POWER TRAIN, ENGINE
I own a 2021 GMC Sierra 1500 equipped with the 6.2L L87 V8 engine and 10-speed transmission. The vehicle exhibits the following issues: Persistent lifter ticking noise audible from the driver-side wheel well, even when the engine is warm. Rough idle that is noticeable at stops and low-speed conditions. Transmission shifting problems, specifically harsh or delayed shifts when downshifting from 3rd to 2nd gear during deceleration. These symptoms raise concerns about potential lifter failure and transmission defects. I am aware of GM’s recall (25V-274) and NHTSA Engineering Analysis EA25007, but my vehicle’s build date (January 2021) currently falls outside the official recall window. Given the similarity of symptoms to those under investigation, I believe my vehicle may be affected by the same defect. Safety Concern: The rough idle and shifting hesitation could lead to unexpected loss of power or unsafe driving conditions, especially during deceleration or merging. Request: Please include this complaint in EA25007 and consider expanding the recall to cover earlier builds. I am willing to provide service records, videos, and additional documentation upon request.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708589January 3, 2026
ENGINE
Motor was chugging took to a dealership on march 22 was told I had a collapsed lifter I was told my cost would be 4800 gm would cover half which was fine then when the work was done the dealership took it for a test drive while they were on the test drive the motor locked up they originally told me it was a cam bearing later I found out through paperwork that was emailed to me that it was a main bearing which is consistent with the recall but my vin number hasn’t came up it’s a 2021 gmc sierra 1500 with a l87 6.2 and it cost me 6200 I was 10,000 miles out of warranty
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708526January 3, 2026
POWER TRAIN, ENGINE
I live in Illinois, my 2019 GMC Sierra 1500 SLT has 51,318 miles on it as of 12/31/2025. What component or system failed or malfunctioned, and is it available for inspection upon request? Engine Oil Cooler hose line detaching from crimp - small oil leak currently. Not yet fixed. Available for inspection. How was your safety or the safety of others put at risk? If this component fails, all oil from the vehicle will be lost and inoperable. This could cause a traffic accident, especially if towing a load. Has the problem been reproduced or confirmed by a dealer or independent service center? Confirmed by an independent service center. I will be taking my vehicle to the local GMC service center for additional confirmations. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No, but GM has acknowledged the issue through these customer satisfaction surveys (CSP XXX/ XXX). Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There has been no failure yet. A small oil leak was found on my garage floor. My issue is that this is a known issue in cold weather climates. 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
#11708577January 3, 2026
POWER TRAIN
Driving on highway at 60mph while towing a travel trailer and the rear tires briefly locked up, the check engine light came on with an explanation mark (!) and the dash displaying a major warning. The truck went into "limp mode." Computer code read P0747. Dealer confirmed issue and replaced valve body. Truck had 22,000 miles. Appears 2023 vehicles should be added to the original recall for long-term warranty protection.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708582January 3, 2026
UNKNOWN OR OTHER
Onstar module is out. No wifi, speed reporting or maps access.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708266January 2, 2026
ELECTRICAL SYSTEM
The OnStar vehicle locater, GPS maps, clock (auto update) are not responsive as of the 2nd week of December 2025. My truck cannot be located via OnStar, I cannot use the GPS Maps for directions, and the Clock reads 12 minutes fast when I put it into Auto Update mode. Reported to my GMC dealer (Elizabeth City GMC, Elizabeth City, NC 27909, and had in for service 3 times without correction of the issue! The dealership conducted a Software System Update which cost me $400.00, and still did not correct the issue. I spoke with OnStar three (3) times to try and correct issues but they did not resolve the problems either. OnStar stated it is a GMC issue............My last service at the Elizabeth City GMC dealer the Service Tech stated the OnStar Module is bad and requires replacement, and stated it will be an additional $550.00 +/-!!! Please advise and assist in further action I can take as this issue should be a Warranty issue and replaced by GMC and/or OnStar!!! Class Action Suit in line! Thank you.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708311January 2, 2026
ENGINE
Friday night coming home. While entering my driveway. The check engine light came on. The engine sounded really bad. Rough idling. Saturday morning. Took it to a mechanic shop. While on my way to the shop, the truck had loss of power. The first mechanic shop told me that the truck was having engine failure. Was not sure at the time but the L 87 is known for having lifters and bearing failure. Monday the truck was taken to the dealership Novak motors. For extended warranty, repair or possible engine replacement. It has been two weeks. Have not heard anything yet. But the timing of the incident was good. Because the engine failed when I was pulling in to my driveway.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708345January 2, 2026
UNKNOWN OR OTHER
OnStar quite working, light nothing. Called Onstar, told me I need to take to the dealer.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708412January 2, 2026
ENGINE
We were driving down the interstate at about 75 mph when a message came up that said to shift to neutral and push the start button. My husband did and it continued to drive perfectly fine, but about 6 miles down the road it did the same thing again except when he pushed the start button it did not start. I cannot begin to tell you the cause as to why it would’ve been doing that as I have never had any other issues with it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708228January 1, 2026
POWER TRAIN
70mph with cruise control on, truck shifted from drive to neutral uncomanded. There were no indications of the issue before it happened. The dealer has the truck and I havent heard back from them yet. From my limited research, this is a common problem for these trucks.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708245January 1, 2026
ENGINE
Bought the truck less than four months ago and as of yesterday it consumed a substantial quantity of oil and later refill. However today it made a noticeable noise until it shut off permanently. Dealer did not disclose this
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707975December 31, 2025
ELECTRICAL SYSTEM
Started car via remote start. When I went out to the car I noticed smoke in the cab. I then observed the rear power slide window to be smoking and further discovered the rear defroster wires the be smoldering creating considerable smoke. The tempered glass then began to spider and completely cracked. There is a former recall on the rear slide window involving fire hazards and the wiring components. It should also be noted that our 9 month old’s car seat is directly below the window and defroster wiring were the smoldering took place. No warnings lamps were observed prior to the incident.
Crash:
No
Fire:
Yes
Injuries:
0
Deaths:
0
#11708004December 31, 2025
ELECTRICAL SYSTEM
The Intermediate speed sensor 2 and internal transmission harness failed. The repair was to replace the internal transmission harness and intermediate speed sensor. This vehicle is a 2021 and I was told this was recalled on a 2022 only.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708015December 31, 2025
STRUCTURE:BODY
While driving down the highway the top part of the front of the grill flew off bounced over top of my vehicle and landed on the ground in the highway where the car behind me then ran it over and it blew into the median. I notified my local GMC dealer who said there is no active recall. Filed a complaint with GMC as this is a known issue and has already been recalled on the 2022 model. They reviewed and denied my claim at this time. It is a known manufacturer issue and creates a highway hazard if they continue to blow off and possibly hit or injure athers
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11708093December 31, 2025
ENGINE
Faulty lifters replaced on passenger side. Had only 25000 miles on engine. GM extended warranty on thousands with this engine but not mine. Have only 28000 miles on truck and just turned 5th year so warranty is void. GM should extend warranty on all vehicles with this engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707766December 30, 2025
SERVICE BRAKES, ELECTRICAL SYSTEM
THE VEHICLE IS AVAILABLE FOR INSPECTION - 35,000 APPROXIMATE MILES WITH A EBCM MODULE REPAIR NEEDED IN ORDER TO REPAIR IT TO A LEVEL THAT MEETS FEDERAL MOTOR VEHICLE SAFETY STANDARDS OF AT MINIMUM S5.3 NO.126 & S5.1 NO. 135 - I BELIEVE THIS VEHICLE SHOULD HAVE BEEN/SHOULD BE INCLUDED IN THE ORIGINAL AND/OR EXPANDED RECALL N192268091. THE VEHICLES ELECTRONIC BRAKE ASSIST IS NOT WORKING CAUSING IT TO BE DISABLED. IT HAS BEEN INSPECTED BY DENNY MENHOLT GMC. WARNING LAMPS/MESSAGE OCCURRED - DIAGNOSED - REPAIR NEEDED TO MAKE THIS VEHICLE SAFE FOR THE DRIVER, PASSENGER(S) AND OTHERS WHEN THE VEHICLE IS OPERATING.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707832December 30, 2025
POWER TRAIN, UNKNOWN OR OTHER
Tailgate can open by switch located at storage area in console. It can be easily bumped then tailgate will o pen without driver receiving a warning light or dashboard message. If this occurs, and it did with this vehicle, any cargo could potentially fall out causing accident to vehicles following. Additionally, the powertrain (transmission) is a known problem for failure. If such a failure occurs the rear wheels can lock up causing accidents/injury to driver and others. NOTE- this has not happened to this vehicle yet but does cause concern for it happening and GM not doing a recall.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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