GMC Sierra Complaints

15,732 consumer complaints on file.

#11661367May 16, 2025
ENGINE
While the vehicle is traveling at highway speeds it is misfiring and sputtering, giving the feeling of a hard shift. When the vehicle is idling, the engine is sputtering like it’s going to shut off. If the truck were to shut down, as it seems to be trying to do, this could be deadly at highest speeds or intersections. The vehicle has been at a dealer since January 2025. They claimed to have fixed it but upon paying over $1200 and picking it up from the dealer, the problem persisted. We had to take it back to the dealer within 5 minutes of picking it with zero repairs and no estimated time of repairs ever since. No warning lights appeared at all.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661445May 16, 2025
ENGINE AND ENGINE COOLING, ENGINE
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed and slowing down to stop, the vehicle suddenly shut off and failed to restart. The vehicle was eventually towed to the residence. The cause of the failure was not yet determined. The manufacturer was notified of the failure, but no assistance was offered. The local dealer was not yet contacted. The contact was informed of the NHTSA Action Number: PE25001 (ENGINE, ENGINE AND ENGINE COOLING). The contact stated that the vehicle had experienced the failure listed in the NHTSA Action Number. The failure mileage was 115,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661455May 16, 2025
POWER TRAIN
Transmission issues 5/5/2025, bearly 15,000 miles on it, was excelerating from a stop heading down hill when rear tires locked up, engine downshifted, engine light and limp mode flashed across my screen. threw it into nutral and coasted to next signal and pulled into gas station back parking lot. No codes pulled. called dealer to share and they knew exactly what was wrong with transmition value body problem. but is my transmission ok? Towed to dealer, no fix in sight. 7th vehicle at dealer with same problem. Others been there for months waiting on same part. Thank God I wasn't towing anything, but now I have to pay for rental and they say they are waiting on parts??
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661484May 16, 2025
POWER TRAIN
I was headed out of town and stopped in the neighborhood at a stop sign. As usual, the Auto Stop/Auto Start feature turned the engine off and when I lifted my foot off the brake pedal to reengage the engine, the truck started rolling backward. The engine would not start even though all the gauges and systems were working as if the engine was on. I had the truck towed to my mechanic and after troubleshooting, they determined the engine was locked up and would need to be totally replaced. My truck has the 6.2L gas engine and have since learned that GMC is recalling later model trucks with this engine in them due to engine failure. If my engine failure had happened anywhere other than at a stop sign in a neighborhood, it could have caused a significant accident. I can't find a new engine because of the GMC recall and the cost to replace the engine with a lower mileage, used engine is approximately $16,500.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661486May 16, 2025
FUEL/PROPULSION SYSTEM, LANE DEPARTURE: WARNING, EXTERIOR LIGHTING
My IntelliBeam function stops working sometimes, I can still use the lights as normal but the IntelliBeam function stops every so often and starts working after about 2 to 10 mins. Lane departure warning stops every so often and will start working after 1 to 10 mins, I have noticed that when it stops working at night time then the IntelliBeam function stops working also. When I press the on/off button for lane departure then it will say that lane departure is unavailable right now. I have been getting a p20ee code showing something is wrong with SCR nox sensor 2. Scan tool reveals that the sensor works normal and then stops. Once I clear the code then it works good for a few days.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661487May 16, 2025
ENGINE
Engine misfire, bringing vehicle to low speed. Safety was a main concern, while I was on a highway and could not maintain a flowable speed with other vehicles. The problem was confirmed by the dealer on 4/25/25 milage 77681, repaired. Then happen again on 5/9/15 milage 79091, repaired and confirmed again by a different dealer. There were no pre-warnings, once it happen all warnings went on.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661494May 16, 2025
SERVICE BRAKES
When dealer took apart my rear brakes the parking brake shoe lining was un bonded from the shoe 26,000 miles and seems to be a defective part
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661497May 16, 2025
POWER TRAIN
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the transmission unexpectedly downshifted. There was no warning light illuminated. The vehicle was able to restart. The vehicle was taken to the dealer, where it was diagnosed and determined that the transmission had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 70,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661558May 16, 2025
ENGINE, POWER TRAIN, FUEL/PROPULSION SYSTEM
On [XXX] this vehicle was in Blue Cruise on [XXX] in Louisiana when it without warning coasted to a stop after the engine quit. Cruise lights remained active, no other lights were illuminated, and the vehicle simply rolled to a stop. La. DOT assisted. The vehicle was towed (complicated that once placed into park, and the engine would not restart, the vehicle cannot easily be placed in neutral to be towed). The vehicle was trailered some ~50 miles and sits at Rainbow NorthShore GMC in Covington, La. This is a series, life threatening situation that all vehicles need be removed from the road. 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
#11661154May 15, 2025
ENGINE, FUEL/PROPULSION SYSTEM
I have not experienced a failure as of yet. But the CP4 fule pump is prone to fail. With that failure the engine is destroyed as well. So why is there no recall to get the CP4 fuel pump replaced? GM has been sued correct? A settlement of $35 million due to the failure of the CP4 fuel pump. So why is there no recall to address the issue before it happens? I have contacted GM directly and got no assistance. They just told me to fill a complaint. My Vehicle is a 2016 GMC Denali 2500 with the Duramax motor. This issue needs to have a recall! Why should owners of these vehicles with the CP4 fuel pumps have to wait until it fails and cost thousands of dollars to get assistance or reimbursement. Would appreciate any help with this matter. Thank You.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661182May 15, 2025
ENGINE
starting in June of 2024 at 6500 miles my truck started exhibiting loud exhaust drones and severe vibrations coming through the dash, floorboard and steering column on excelleration. The truck has been in repair 7 times in the past 11 months and multiple parts have been changed. I learned that there are thousands of General Motors 1500 trucks equipped with the 3.0 LZ0 Duramax diesel engine exhibiting the same symptoms. A General Motors Field Engineer found Broken exhaust bracket studs at the engine block caused by exhaust alignment and engine/transmission mount stress from worn components. These trucks are coming from the factory this way and continues with 2025 model year. My son owns a 2025 GMC AT4X 3.0 LZO and has the exact same symptoms.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661191May 15, 2025
SERVICE BRAKES, ELECTRICAL SYSTEM
Ok I know my vin don't go under the 10 recalls for 2019 gmc sierra limited 1500 rwd, but my truck has the same problem with the brake module has those recalls I feel like gmc might have used different parts for the other recall but used the same brake module for my truck cause I have that same problem has the recall. It's obviously a issue that needs to be look in and my brake module should be fixed by gmc
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661210May 15, 2025
ELECTRICAL SYSTEM
GM has has a known issue with a switch/sensor placed at the base of the shifter that causes the “shift to park” error message that prevents the electrical system from shutting down when the vehicle is physically in park and the engine is turned off, In fact, GM has issued a recall for several different models in which a “shift to park” error message is displayed because of the poor design; however, they continue to see the same issue occur but claim it is not a warranty issue (unless it occurs within 3 year/36,000 mile time frame. This is not an issue that can be caused by owner misuse, and I believe that GM should be held liable for repairs given that the issue is, and has been, known for several years now.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661225May 15, 2025
SERVICE BRAKES, ELECTRICAL SYSTEM
I was driving about 45 mph when the vehicle started to brake on its own. Message center said "Brake Failure max speed 62 mph". I had to move the vehicle, so I continued forward. It was still trying to self-brake, i decided to stop and turn ignition off so computers could re-set but I had no brakes. I had to stand on brake pedal to get it stopped. Turned ignition off and restarted. The problem was gone, but it happened again 2 weeks later. Took to dealership where purchased and they said it needed a computed recalibration. Something I didn't know about. They charged me $200 to recalibrate the computer. My issue is the danger of not having brakes, not the $200. How many similar vehicles could this happen to?
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661258May 15, 2025
STEERING, SERVICE BRAKES
This is a second report of an issue that first happened in February 2025, the dealer replaced the battery and called it fixed. On Friday 5-2-2025 I started the vehicle and as I was driving the dash lit up with these warnings: Service Trailer brake system, Service ESC, Brake System Failure 62 mph top speed, Steering assist reduced drive with care, The vehicle steering got stiff and brake pedal went to the floor board with a little braking available if I stood very hard on the brake pedal. I got off to the side of the road, cycled the truck on and off and was able to drive off. It did this three times before I could get it to the dealer the next day, If my daughter was driving I would have expected that two of the three would have resulted in a wreck as she would not have been strong enough to steer or stop the vehicle. The dealer had it three days and replaced the brake master cylinder and called it fixed, I picked the vehicle up and on the way home I stopped for gas, after the gas station the dash displayed: Service brake assist, I turned right around and took it back to the dealer, they checked the code and said the brake assist module was drawing too much current, I picked the vehicle back up three days later, they said they bleed the air out of the brake system and called it fixed. No one wants to ride with me and my daughter is begging me to trade the truck, they call it a death trap waiting to happen. GM says it is all normal issues.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661333May 15, 2025
FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
I was traveling on the interstate, going a little over 70 MPH as I was passing a tractor and trailer. There were no other vehicles in front of me. Suddenly the truck jerked like the breaks were being applied and my speed was quickly reduced to around 60 MPH. The heads up display showed a crash alert orange symbol. I pushed the gas to try to get back up to speed but the truck would not accelerate and the speed kept dropping. I pulled over to the berm and came to a stop. There was a message on the message center but it went away before I could read it with everything else happening. I put the truck in park and waited a minute then I pulled back out and was able to get the truck back up to speed and home. I plan to contact my dealer tomorrow. The ruck was involved in an accident that damaged the front in earlier this year so I believe some or all of those sensors have been replaced. This is the first issue we’ve had since purchase. If there would have been a vehicle following behind me, the rapid breaking/deceleration could have caused an accident. Also the inability for me to regain my speed when traveling on an interstate was a danger to myself and others.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11660964May 14, 2025
ENGINE, ELECTRICAL SYSTEM
I was driving home from work one day my truck started. Losing power I could press the gas to make the truck drive it started slowing down
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11660995May 14, 2025
UNKNOWN OR OTHER
Cracks in the rear sliding window plastic upper rail glass guide causing Rear window leaking water and causing mold from water leaking. GMC has a service bulletin number 18-NA-383 knowing of this issue and not telling customers purchasing the GMC vehicle. The service bulletin was released in 2019 before purchasing the truck and they still didn't inform the customers. My child rides in the back in a car seat and now has been breathing in this mold and mildew for how long. I have had my vehicle in with Titus will Gmc in olympia multiple times for service and inspection of various recalls and still didn't inform me of this issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661018May 14, 2025
ENGINE
General Motors has decided that a defect which relates to motor vehicle safety exist in my 2024 model year GMC Sierra 1500 vehicle equipped with the 6.2L V8 gas engine (RPO L87). The connecting rod and/or crankshaft engine components in these vehicles have manufacturing defects that can lead to engine damage and engine failure. If the engine fails during vehicle operation, the vehicle will lose propulsion, increasing the risk of a crash !!!! After contacting my local GM dealers, three of them, NONE OF THEM CAN OR KNOW HOW TO REPAIR THIS LIFE SAFETY ISSUE with my vehicle. Please direct GM to buy back my 2024 GMC Sierra SLT vehicle. v/r [XXX] 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
#11661083May 14, 2025
ENGINE
My engine suffered a catastrophic failure, at 139468 miles. 2019 GMC Sierra Denali 1500. I had the engine replaced with a new engine date June 2024 GMC 6.2 engine failures is happening with more than just 21-24 models years.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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