GMC Sierra Complaints

15,732 consumer complaints on file.

#11663023May 25, 2025
ENGINE
Driving at freeway at 65mph, suddenly is air noise like air conditioning blows air at high fan speed, than the dash info shows (Engine Power is Reduce) try to accelerate to pull out of lanes, and it did not, keep losing speed, as slowly move lanes to the right of freeway, and then exit.. This is the second time of this incident, first time under warranty, dealer fix transmission first time, then two months later, the tansmission was replace wit a newone, now is passed warranty, had the car taken to dealer, they gave me and estimate of more then $10,000 to fix the vehicle, this happen on May 21, 2025...
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662707May 23, 2025
POWER TRAIN
Transmission fluid overheating, which is a known issue in other GM models with 6.6L diesel with 12 speed allison transmission. Confirmed by warning message received on dashboard and transmission fluid temperature gauge. This occurred within 3 weeks of purchase. Dealer confirmed “Valve” needs to be replaced. Part is on back order with no arrival eta. Service advisor indicates the truck is not safe to drive and remains in the service department.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662754May 23, 2025
ENGINE
Unknown There is a recall on the this model but with different motor but when I took mine in they said it was a.manufactured defect but I was out of warranty because I purchased it cash and didn't get extended warranty now im having to replace and pay for a head and new engine over 10,000 when vehicle doesn't even have 70,000 miles it started with a engine light going on amd off for 2 weeks then it just stopped working It's too coincidental that the sister truck make n model to this had a recall for exactly what is wrong with mine
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662760May 23, 2025
SERVICE BRAKES, HYDRAULIC
The contact owns a 2018 GMC Sierra 1500. The contact stated that while depressing the brake pedal, the brake pedal displayed more resistance than expected, causing the contact to have to apply more pressure while depressing the brake pedal. The contact stated that the braking distance was extended due to the failure. The vehicle was taken to the dealer who diagnosed that the brake vacuum pump had failed and needed to be replaced. The vehicle was not repaired. The contact became aware of NHTSA Campaign Number: 19V645000 (Service Brakes, Hydraulic); however, the VIN was not included. The manufacturer was informed of the failure and confirmed that the VIN was not included in the recall. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 75,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662792May 23, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2022 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662823May 23, 2025
SERVICE BRAKES
I am experiencing an issue with a hard brake pedal on my 2014 GMC Sierra 1500. This same issue was previously addressed through a recall and special coverage program by GM, which I had performed. However, the hard brake pedal condition has returned, significantly impairing stopping power at low speeds. This poses a serious safety risk, especially when towing or parking. I can no longer park my trailer safely. The vehicle is difficult to stop, and braking distance has increased substantially. This is a known issue with this model and year. It appears the prior recall may not have adequately resolved the root cause. I am requesting that NHTSA investigate whether additional action or recall extensions are warranted.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662855May 23, 2025
POWER TRAIN
I was driving home from work and my truck down shifted and rear wheels locked up, now it’s in limp in mode and will not shift.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662870May 23, 2025
POWER TRAIN
Transmission valve control malfunctioned, causing rear wheels to temporarily lock, skidding the tires. This almost caused me to loose control, endangering myself and others around me. This is the second time this problem has happened. A recall related to this was addressed on this truck, though it has clearly done nothing to prevent it from happening.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662873May 23, 2025
POWER TRAIN
Transmission valve control system malfunctioned, causing rear wheels to lock up at high speeds, in turn causing tires to skid out. This issue almost caused me to loose control of the vehicle, potentially endangering the safety of myself and others near me at the time. This is the second time this has happened while I have been driving this vehicle. There was a recall related to this issue, which was addressed, but very clearly did absolutely nothing to prevent this incident from occurring.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662486May 22, 2025
ENGINE, POWER TRAIN, UNKNOWN OR OTHER
Vehicle drop in gear / down shift while driving on the highway. went from 75MPH down to 55MPH due to high RPM revs.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662487May 22, 2025
ELECTRICAL SYSTEM, ENGINE, POWER TRAIN
Vehicle Stuck in gear. Dealership was delivering the car back to myself when about a mile out from my house when the vehicles made a sudden downshift and was stuck back in gear. Driver called and notified me that it was on its way back to the shop for further work
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662488May 22, 2025
ELECTRICAL SYSTEM
While driving my vehicle it began down shifting harder than normal (at various speeds and road (highway, city and dirt road)); along with a noticeable burning smell after every trip. GM Maintenance personnel discovered that the wire was chafed and arching / catching on fire underneath passenger side resulting in the burning smell and the wiring issue aligned to the transmission. Personnel took a video and provided to me as evidence of the fire / smell; however, that was on their official GM app so i was unable to download
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662489May 22, 2025
UNKNOWN OR OTHER
Engine light came on while driving / aligned to transmission temp sensor error and brake sensor GM Maintenance was able to diagnosis that the Temperature Loop Coolant Pump had failed and needed to be replaced.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662491May 22, 2025
ENGINE, UNKNOWN OR OTHER
No warning; picking up child from daycare. went to depart daycare when my dash lit up like a Christmas tree with various errors, alerts, warnings; along with, not being able to start. had to be picked up by spouse and get the truck towed to the dealership for maintenance. Maintenance tech discovered that the grounding straps for the truck needed to be replaced / resulting in a complete electrical failure of the vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662494May 22, 2025
ELECTRICAL SYSTEM
After repair got a few miles down the road and noticed the volt meter jumping back and forth between the white lines. Line would slowly go up to max line and then slowly drop back down to lower limit and continue to go back and forth. This was very concerning to myself and i was waiting for something to fail while driving. Got about 10 miles away and was to concerned / returned the vehicle Informed by GM Maintenance tech that this is what / how the vehicle is designed and that it is the operating within its parameters. I expressed that only time i noticed something like this was prior to an engine light / electrical failure; however, maintenance team expressed GMs stance that it is operating within tolerance.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662496May 22, 2025
ENGINE, ELECTRICAL SYSTEM, POWER TRAIN
Engine light came on and real bad urine smell / burning coming from the vehicle / rough performance. This issue occurred at various speeds / trips / drive types with the only variation being speed from 25MPH to 75MPH. Vehicle went in to discover that the reductant control module software (RCM) out of date, and two NOx sensor failures
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662497May 22, 2025
ENGINE, POWER TRAIN, UNKNOWN OR OTHER
Vehicle was going in for warranty recall; however, i requested they look at the DEF system as my DEF gauge would bounce between full and empty; along with, alert me of going into LIMP mode. GM Maintenance updated the recall and noticed that the DEF tank sensor failed and required to be replaced.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662500May 22, 2025
ELECTRICAL SYSTEM, ENGINE, POWER TRAIN
Engine light would come on for a few days and than turn itself off. this occurred for about 8/9 months; however, instructed by the GM Maintenance department that if the vehicle came in and the light turned off before they got to it i would be charged for the diagnosis and no work would be performed. Engine light came on and i was able to park the vehicle / they picked it up and read it prior to putting in their lot until a tech became available. GM Maintenance was able to diagnosis that there was an issue with the EGR sensor and NOx catalytic converter without filter failed / both items replaced
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662504May 22, 2025
ENGINE, ELECTRICAL SYSTEM, POWER TRAIN
Engine Light came on, performance rough at various speeds / conditions, and smelled like burning and strong urea smell. GM Maintenance identified a failed DEF injector / replaced
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11662535May 22, 2025
ENGINE
We have the 6.2 liter GM engine that has lost propultion. We are not covered in the recall and are 30,000 miles above the milage warranty, but still within the time portion of the warranty. GM payment assisitance has only offered us $1600 to help with replacing our engine. The dealership told me their warranty parts price was higher, so it really didn't offset any cost. This is our ONLY vehicle for our small appliance repair business. Our vehicle was manufactured at the plant in Canada where all the other faulty engines were manufactured. Please consider widening the recall to include our vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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