GMC Sierra Complaints (2014)

895 consumer complaints on file.

#11771902October 18, 2026
AIR BAGS
During normal driving conditions and no collision, side/roof rail airbags spontaneously deployed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11770579October 12, 2026
ELECTRICAL SYSTEM
While stopped at at a light it turned green and I hit the gas and wouldn't move until I turned it off then back on again..
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11769597October 7, 2026
AIR BAGS, SEAT BELTS
The contact owned a 2014 GMC Sierra 1500. While the contact's wife was driving 45 MPH, the vehicle crashed into another vehicle. The contact stated that the air bags failed to deploy, and the seat belt failed to restraint the driver as intended. The vehicle was towed to a local tow yard. The vehicle was deemed a total loss by the Insurance Company. The driver was transported to a local medical center. The driver sustained bruised left and right knees, a bruised chest and ribs, and bruised lungs. A Police report was filed. The manufacturer was contacted, and a case was filed. The failure mileage was approximately 124,000.
Crash:
Yes
Fire:
No
Injuries:
1
Deaths:
0
#11769420October 6, 2026
STEERING
The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving at various speeds on several occasions, the vehicle lost power steering assist. While driving 55 MPH, the failure recurred, nearly causing a semi-truck to crash into the vehicle and causing the vehicle to veer off the ramp. The contact's dog jumped out of the vehicle into the bushes and sustained a minor injury. The Brake Assist, ABS, Stabili-trak, and power steering assist warning lights illuminated, and the message "Electronic Steering Failure" was displayed after the failure. The contact turned off and restarted the vehicle, and the vehicle operated as intended. Additionally, the contact stated that the ABS seemed to fail to operate as intended. A dealer was contacted by phone and stated that the power steering control module might need to be replaced. The contact associated the failure with NHTSA Campaign Number: 17V414000 (Steering). The failure mileage was approximately 134,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11766010September 21, 2026
STEERING
At low speeds, and not 100% of the time, the power steering will go out while I'm turning. It just does it on its own and will correct itself in a few seconds, usually when I'm done with the turn. It's at very low speeds, like parking in a parking lot or turning around in front of my house. So far no issues turning at normal speeds in traffic. Very scary at the low speeds especially since my wife and my young daughter might drive it in a year when she gets her license. I can kind of still turn it, but I know they can't and a new driver will more than likely panic.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11757905August 19, 2026
STEERING, POWER TRAIN
The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle jerked and pulled to the right. No warning lights were illuminated. In addition, the contact stated that while driving over a bump in the road, the vehicle lost automotive power and shut off. The contact restarted the vehicle. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 230,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11754615August 3, 2026
POWER TRAIN
I am experiencing ongoing issues with the 6L80E transmission that have significantly affected the performance and reliability of my vehicle. The transmission shifts harshly between gears, hesitates when accelerating, and occasionally slips before engaging. There is also a noticeable shudder during acceleration and inconsistent shifting, especially at lower speeds. These problems have become more frequent over time and raise concerns about the safety and dependability of the vehicle. The transmission does not operate as expected for normal driving conditions, and the issues negatively impact the overall driving experience. I am requesting a thorough inspection of the transmission, an explanation of the cause of these issues, and an appropriate repair or resolution to restore the vehicle to proper working condition.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11747926July 2, 2026
ELECTRICAL SYSTEM, STEERING, UNKNOWN OR OTHER
Truck shut off and would not turn back on. Negative battery cable so hot it burned skin off. Would not start, tried to start clicking sound, radio blipped for a moment.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11743787June 12, 2026
SERVICE BRAKES
The vacuum pump has been recalled on same year, make and model vehicle, yet my particular VIN is falling to the wayside. IT HAS A VACUUM PUMP issue, causing the brakes to malfunction at slower rates of speed. A "computer programming recall" was applied to my VIN however it is the ACTUAL Vacuum pump that is the problem. This should have been covered in all year, make and models. BRAKES ARE IMPORTANT! Reprogramming did not solve the vacuum pump issue that is causing the brakes to fail! This is absolute negligence on behalf of General Motors.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740415May 27, 2026
ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
The contact owns 2014 GMC Sierra 1500. The contact software modification done at a transmission shop, affected the Active Fuel Management not allowing diagnostic. The manufacturer was not notified of the failure. The approximate failure mileage was 210,000
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738994May 20, 2026
ELECTRICAL SYSTEM, UNKNOWN OR OTHER
Starter went out and needed replaced. I know there is a recall on other models in the same year and mode;l but mine wasnt listed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11736362May 7, 2026
POWER TRAIN
The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving downhill, the vehicle failed to accelerate as intended while depressing the accelerator pedal. In addition, the vehicle felt as if it were in neutral. The tachometer gauge revved up independently. No warning lights were illuminated. The contact pulled to the side of the road. The contact opened the front hood and noticed that one of the transmission lines had failed. The vehicle was towed to the residence. The contact replaced the hose and filled up the transmission reservoir. The contact stated that the failure persisted. The vehicle was taken to a specialty transmission place and rebuilt the transmission. The vehicle was repaired. The contact stated that a few months later the failure persisted. The vehicle was towed to the specialty shop, and the transmission was replaced. The contact stated that a few months later, while driving at an undisclosed speed, an abnormal odor was emitting from the front end of the vehicle. The contact was able to pull to a rest area, and when the front hood was open, the contact noticed that one of the transmission lines had a leak and transmission oil was being sprayed all over. The contact was able to replace the transmission hose. The manufacturer was not made aware of the failure. The failure mileage was unknown.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727180March 26, 2026
ENGINE
6.2L Engine has well documneted problem with the valvetrane, I have had to fix it 2 times in 3 months. I have pictures and documents from servicing dealerships. Since my ownership, it has always been dealer-serviced. Unexpected catastrophic engine failure, which happened on a major interstate. GM service technicians know there is a valvetrane issue. This instance, the warning light came on under and overpass, and the truck coasted to a stop just past the end of the on-ramp. A GM (Chevrolet dealership currently has it) and a GMC dealership has serviced it since my ownership.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11722258March 5, 2026
FUEL SYSTEM, GASOLINE
The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving 30-40 MPH, the vehicle lost motive power, and RPM became raised. There was no warning light illuminated. The vehicle was taken to an independent mechanic, and was diagnosed with lower and upper fuel pump failure. The contact was informed that the lower and upper fuel pumps needed to be replaced. The independent mechanic made the contact aware of TSB Number: 13370A (Fuel Pump). The vehicle was not repaired. The manufacturer was notified of the failure and the TSB; however, the VIN was not included. The manufacturer opened a case. The approximate failure mileage was 105,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11719926February 23, 2026
ENGINE
The contact owns a 2014 GMC Sierra 1500. The contact stated that while at a stop sign, the vehicle stalled. No warning lights were illuminated. The vehicle was towed back to the residence. A dealer was contacted; however, the vehicle was not diagnosed or repaired. The contact researched and became aware of an undisclosed recall; however, the VIN was not under recall. The manufacturer was not notified of the failure. The failure mileage was approximately 81,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718877February 18, 2026
ENGINE
The vehicle experienced complete lifter failure on cylinder number 4 bending the intake valve push rod thus shutting down the cylinder. The vehicle has 167,000 miles and is well maintained. The vehicle gave no warning signs that there was a problem. Simply driving down the road, normal engine temperature, normal oil pressure, the check engine light comes on at the same time the engine begins to mis-fire. Pulling over to the side of the road, I could hear lifter noise from the right bank of the engine. The dealership (Ocean Crest Chevrolet/GMC Warrenton, Oregon) confirmed the damage. The mechanic and the service manager both state the damage is a direct result of the GM cylinder deactivation system, and every single one they have repaired has been cylinder number 4. They further stated that GM has recommended a lifter change when repairing the damage, in other words, the lifters that were installed when the engine was originally built are defective. This damage occurs on both the 5.3 and the 6.2 with cylinder deactivation, and according to the dealership, it begins with cylinder number 4. This problem has also been responsible for cam damage which results in total engine replacement/rebuild due to metal contaminating the oil.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705584December 17, 2025
VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REAR WINDOW
The contact owns a 2014 GMC Sierra 1500. While the contact's husband was driving at an undisclosed speed, the contact became aware that there was smoke coming from the rear window and the window shattered. The contact stated that the defroster was operating during the failure. The contact stated that the shattered glass had fallen on the contact's minor son, who was seated in the rear seat. The son had not sustained any injuries. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The dealer was made aware of the failure. The contact was informed that the repair was previously performed and covered under the warranty. The contact was informed that the current repair was not covered under warranty. The contact was advised to contact the NHTSA Hotline to report the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 156,800.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696738October 31, 2025
ENGINE
Engine failed December 2024 at 140,274 miles. 2 cylinders failed due to lifter failure and had a total loss of power. Engine was replaced by a local shop.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11691120October 3, 2025
ENGINE, POWER TRAIN, SUSPENSION
hard shifting transmission and fluid smells burnt, shifts hard in the lower gears and reverse
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11690613September 30, 2025
STRUCTURE, SUSPENSION
The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving approximately 45 MPH, the vehicle drove over a slight bump in the road. The contact stated that the vehicle bounced, and then there was an abnormal banging sound coming from the rear of the vehicle. The contact recently had work completed on the exhaust system. The contact took the vehicle back to the independent mechanic who had performed the exhaust repair. The mechanic raised the vehicle on the lift and became aware that the rear passenger’s and driver's side cross members, supports for the shock absorbers, and the rear sub frame had extensive corrosion. The contact was advised by the mechanic that the banging sound was coming from the shock absorbers striking the bed of the truck while driving over the bump in the roadway. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was 78,569.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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