GMC Sierra Complaints

15,732 consumer complaints on file.

#11458637March 28, 2022
SERVICE BRAKES
The contact owns a 2018 GMC Sierra 3500. The contact stated after driving on a long downhill road at an undisclosed speed with his 2017 Highland Ridge 349 RV hooked to the vehicle, as he was reaching a leveling point and depressing the brake pedal to slow the vehicle, the brakes failed to operate as needed. The contact stated that as he depressed the brake pedal further, the brake pedal overheated and would no longer respond properly. The contact stated that the vehicle was rated at 22,000-23,000 while the trailer was 14,300 pounds loaded maximum. The contact stated that the trailer currently weighed 11,000 pounds. There were no warning lights illuminated. The contact stated that the failure had been reoccurring while driving. The vehicle was taken to the dealer who informed the contact that the braking system was operating properly. The manufacturer was not notified of the failure. The failure mileage was unknown.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11458511March 27, 2022
FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING, SERVICE BRAKES, ELECTRICAL SYSTEM
Truck drove as expected with no prior warnings. We pulled over for road snacks/drinks upon starting the truck we got a whole slew of warnings and warning lights. The warnings included:. Service ESC, Service Trailer Brake System, Service Brake Assist, Steering Assist is reduced Drive with care and finally Brake System Failure 43 MPH top speed. The check engine light, Traction Control Off and BRAKE light stayed on. We slowly drove to an O'Reilly's and got the ODB Code P25A2 (1 of 2 stored) and P25A2 (2 of 2 pending). I then noticed I had an email notification from OnStar Advanced Diagnostics: This is a Diagnostic Alert for your GMC Sierra. Dear [XXX], An issue with the Antilock Braking System in your 2022 GMC Sierra has been detected. Please service your vehicle within 7 days. The following morning the truck was was started and all seemed normal like nothing ever happened, no warning lights or warning messages Our of concern we dropped off at Garlyn Shelton Buick GMC service center to diagnose the issue. They reported finding code C05B0 for Brake Fluid Leak. Further states No external leaks found, Brake Fluid test passed 2 of 3 times, recommend needs Master Cylinder Assembly but No replacement parts available. 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
#11458469March 26, 2022
SERVICE BRAKES, ELECTRICAL SYSTEM
Service trailer brakes light pops up and chimes over and over again. I've never pulled a trailer. It's distracting and will randomly go off. Seems to go off when gas is below 1/4 tank. Sometimes it goes months without happening. Sometimes it happens a few days in a row. The dealership says they can't do anything unless they see it go off.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11458470March 26, 2022
POWER TRAIN
When I'm coming to a stop and the vehicle starts downshifting, the last shift feels like the tranny is going to fall out. Forceful jerk and clunking noise. It's sporadic. One week it's almost every day, one week it seems fine. The dealership said they have heard this a lot and laughed when they told me the manufacturer has told them it's normal. It's definitely not normal.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11458152March 24, 2022
AIR BAGS
The contact owns a 2011 GMC Sierra 1500. The contact stated that the air bag warning light was illuminated. The contact later received notification of NHTSA Campaign Number: 21V054000 (Air Bags). The vehicle was taken to the dealer where the front passenger's side air bag was replaced; however, the air bag warning light remained illuminated. The dealer informed the contact that the failure could be associated with the front driver's side air bag; however, there was no recall for the front driver's side air bag. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 72,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11458165March 24, 2022
SERVICE BRAKES, ENGINE, VEHICLE SPEED CONTROL
service trailer brake system, service esc, steering assist is reduced, brake system failure. almost had an accident because of the brake system failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11458192March 24, 2022
SERVICE BRAKES
Brakes have stopped working while driving down the road, previously they have occasionally glitches out primarily for example when I pull into a drive through restaurant or in a parking area. Service Brake Assist pops up.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11458224March 24, 2022
STEERING
2016 Denali 2500 Diesel - Loose steering, like many of the others complaining. I only have 13,000 miles on the truck since I don't drive it during Ohio winters (salt) and use it to tow my 6500 lb boat. Doesn't feel safe at all when towing. The dealer explained both the pitman and idler arm were worn. $1500 repair bill. Very frustrating that GM doesn't cover this potential safety related issue regarding vehicle control/stability. Several versions of Technical Service Bulletin's exist #PIT5501D as an example.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11458045March 23, 2022
POWER TRAIN
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle shuddered. The vehicle was taken to the dealer however, the mechanic could not duplicate the failure. The vehicle was then taken to Gilland Chevrolet GMC (3071 N US Hwy 231, Ozark, AL 36360) where the contact was informed that the vehicle already had new transmission fluid filled in the transmission. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 42,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11457732March 21, 2022
ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL, SERVICE BRAKES
The contact owns a 2017 GMC Sierra 1500. The contact stated while driving 70 MPH, the vehicle began to independently brake without depressing the brake pedal. The contact stated that the "trailer brake service" and the "service brake" warning light were illuminated. The contact pulled off the road safely and drove the vehicle to his residence. The contact had not taken the vehicle to a local dealer. The vehicle was not diagnosed or repaired. The contact had received an unknown recall letter from the manufacturer. The manufacturer had not been informed of the failure. The failure mileage was approximately 14,230. The VIN was unavailable.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11457481March 20, 2022
ELECTRICAL SYSTEM, ENGINE, VEHICLE SPEED CONTROL
DEF system failed. Wire harness burned out. Tank failure. Truck went into limp mode. I personally know 3 others with the same issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11457511March 20, 2022
ELECTRICAL SYSTEM, SERVICE BRAKES
“Service- trailer brake system” light keeps coming on. It is super repetitive. It comes on about every 30 seconds. It’s a loud beep that lasts quite a few seconds. Eventually, the beeping did not stop until the truck was stopped. Truck was just bought yesterday. Happens at any speed, even when stopped.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11457221March 18, 2022
POWER TRAIN
when I bought the vehicle in October2018, I have taken the vehicle back to the dealership multiple occasions and they refuse to fix this issue. The transmission shifts from first to second gear or second to first gear is clunky, jerks forward and shifts without warning. While sitting at a stoplight, the vehicle will sometimes lurch forward several inches without warning even with your foot on the brake. Furthermore when accelerating between first and second year it's sluggish and takes several seconds to shift from first to second the engine Revs high.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11457356March 18, 2022
FUEL/PROPULSION SYSTEM
Diesel Fuel Gage is Not reading Properly. On a Full Tank which use to say I have approx., until 468 Miles, until I Have to re-fuel. Now Reads Less then 288 Miles, on a Full tank. I have reported this Problem to the Town and Country, GMC, Dealer, of Alamosa, CO. when I have taken My Vehicle in for Service on several Occasions, and Nothing has been done about it. and GMC, has still NOT replaced the Recalled Passenger Air Bag. My Wife sits there and Could be Killed Should Her Airbag be deployed. Thank You [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
#11457358March 18, 2022
FUEL/PROPULSION SYSTEM
Vehicle Shows on the Dash readout that the truck must keep going to clean out exhaust keep Driving, then comes to a Slowdown, and on a slight hill Stops. When you shut it off, and start it up again, it goes about a Mile, states the same thing on the dash panel, then starts to slow down, I was in the Desert of New Mexico, Had left Flagstaff, AZ. an hour before this started happening. I had no Previous warning. Took 6 hours to reach a GMC Service Center. usually takes 2 hours to reach the same town. Cortez, Colorado. They Could NOT Help Me, they had to referred me to a Service Center in town, that Put me on his machine, and Made the Vehicle Heat up, Run HOT, and Exhaust itself for two hours, this got me to my home in Monte Vista, CO. Then No further Problems until about a Month later i started getting the Same Messages, i took it to a Service Center in AR. where he Forced the Vehicle to Get Hot, exhaust itself for four and a half hours, to Clean it out, and Clear my dash Pannel.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11456825March 15, 2022
FUEL/PROPULSION SYSTEM
DEF tank system failure. Vehicle is under warranty, 18 months old, (purchased 08/20) with 20,000 miles. 6 WEEKS AGO I took to dealer who informed me that there are no DEF tanks available and don't know when they will be available. This is a hazard: if I am on a trip and the system shuts off I could be stranded anywhere with the reduced speed that the DEF system creates. If this system is designed to shut off (with warning) there should be ample supplies at all GMC dealers for repair. If there aren't ample supplies the system should NOT shut the truck down. THIS IS A SAFETY HAZARD THAT IS PREVENTABLE!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11456261March 11, 2022
ELECTRICAL SYSTEM, SERVICE BRAKES
Service Trailer Brake System Alert constantly going off
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11456285March 11, 2022
AIR BAGS
2011 GMC SIERRA. CONSUMER WRITES IN REGARDS TO PASSENGER SIDE FRONTAL AIRBAG SAFETY RECALL. THE CONSUMER STATED THE DEALER HAS NOT BEEN PROVIDED THE NECESSARY PARTS TO REPAIR THE VEHICLE. *JS
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11456331March 11, 2022
UNKNOWN OR OTHER
In short, the Diesel Exhaust Fluid (DEF) reductant heater failed which requires the entire DEF tank assembly (part 85138746) to be replaced on my 2020 GMC Sierra 3500. This cause the truck to go into "limp" mode where it will not travel above 65 mph, and after another period, the speed continues to be reduced down to 25 mph. Prior to the speed being reduced, there is a warning message that appears stating "Service DEF System See Owner's Manual" and a warning light illuminates in the gauge cluster. Any severe reduction in speed that can cause the truck to go "limp" is a safety concern. In addition to being a safety concern, some quick internet research reveals that this has been a known problem with GM's DEF system since at least 2019. The electrical connections are too small for the current which supplied the DEF tank heater, causing the system to short and trigger the truck into limp mode which renders it useless. The replacement part is on national backorder, and it has been on backorder for years. My truck is completely useless until this part (or a better-engineered replacement) arrives at the dealer, and there are hundreds if not thousands of people waiting on this same, defective part to get their trucks back on the road. People are losing their livelihood and the means by which they support their families. GM has known about this defective part for years and has done nothing- neither engineered a better part nor issued a recall with some kind of workaround. They haven't even been able to stock the defective part, and this is not just a supply chain issue as new trucks are still being built. This problem was not inspected by any police or insurance agency as it did not cause an accident or injury in this case.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11456370March 11, 2022
STEERING, SERVICE BRAKES
The contact owns a 2016 GMC Sierra 2500. The contact stated while driving at an undisclosed speed four years ago, the steering wheel became significantly loose, causing the contact to lose control of the vehicle. There were no warning lights illuminated. The contact depressed the brake pedal and veered to the side of the road. The contact then continued to drive at slower speed and away from other vehicles. The vehicle was taken to the dealer and was repaired under Technical Service Bulletin Number: PIT 5501F; however, after the repair, the front-end of the vehicle and the steering wheel would wobble while depressing the brake pedal. Additionally, the contact stated that the steering wheel failure reoccurred several months ago while driving. Upon inspecting the vehicle, the contact removed the driver's side wheel cover and discovered that the brake fluid had been leaking inside the wheel well and underneath the floorboard under the steering column. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 4,450.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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