2015 GMC SIERRA 1500 Complaints

The motor goes into a V4 to v6 to v8 Mode on its own .. in which it makes the lifters & pistons change to cause problems with the motor

Had to have transmission replaced and engine work (lifters and cam) on a GM truck with 100,000 miles on it. Cost $8,000. Was told by both mechanics that they've seen many of this same issue with this same year truck for GM.

The contact owns a 2015 GMC Sierra 1500. The contact stated while driving 75 MPH, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. Additionally, the contact stated that there was an abnormal squeaking sound coming from the vehicle. The vehicle was driven to the shoulder of the roadway. The contact stated that the failure reoccurred while hauling a trailer full of horses. The vehicle was towed to the contact's parent's residence. The vehicle was diagnosed by an independent mechanic and was diagnosed with a failed torque converter. The contact was informed that the torque converter needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 129,000.

The contact owns a 2015 GMC Sierra 1500. The contact stated that the vehicle shuddered upon depression of the accelerator pedal, there was no warning light illuminated. Upon investigation, the contact determined that the failure was likely caused by the torque converter. The dealer was contacted about the failure and informed the contact to take the vehicle for an inspection. The contact took the vehicle to an independent mechanic where the torque converter was flushed, and the transmission filter was replaced. Despite the repair, the contact stated that the failure worsened soon after the repair. The vehicle was taken back to the independent mechanic where the vehicle remained. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline to file a complaint. The vehicle was not repaired. The failure mileage was approximately 140,000.

The contact owns a 2015 GMC Sierra 1500. The contact stated that while driving and attempting to make a right turn, the vehicle lost motive power and the steering wheel became very firm and the vehicle became difficult to maneuver. The contact almost rear-ended the vehicle in front. There were no warning lights illuminated. The vehicle was not diagnosed or repaired by an independent mechanic or local dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 110,000.

The contact owns a 2015 GMC Sierra 1500. The contact stated while driving at an undisclosed speed, the air bag warning light illuminated. The vehicle was taken to the dealer; however, the diagnostic test had not been completed. The contact stated that the vehicle had previously been repaired under NHTSA Campaign Number: 20V736000(Air Bags) in 2020. The manufacturer was made aware of the failure. The failure mileage was approximately 119,000.

After parking the truck in the garage, the "check power steering," light came on. I immediately lost power steering. I shut the truck off, and about a minute later started it and the power steering worked enough to turn the wheel 1/4t turn to the right and the wheel locked and never moved again. I don't mean hard to turn, I mean would not turn. Had it towed to the dealership in Fairbanks, Alaska and they verified that the wheel would not turn at all. Recommended replacement of the streeting box. There were no prior indicator lights on the truck and little warning of failure. Losing ability to control the truck could have got me in a bad accident. I understand that this was an issue and there was a GMC recall, but my truck was not part of that. The Fairbanks dealership said they never saw one lock up light that before. The truck does have a damaged title due to a house fire and the truck was parked near the garage and it melted the plastics/grill etc. Repairs were made by a certified body shop.

Had two lifters collapse and fail. Replaced transmission twice due to torque converter failure

I am on my 4th radiator and 3rd thermostat. August will be 1 year ! 2014 models are covered 2015 (like mine) is not covered. Transmission has shifted like crab since day of purchase 3 years ago. I am told it is a known issue from the factory with no solution. Truck also had a weird tick sense day one which turned into 2 failed valve springs. I have had 2 ball joints FAIL 1st time a month after purchase in my driveway. Second time 2000 miles later same side on my street

The contact owns a 2015 GMC Sierra 1500. The contact stated that while driving approximately 15 MPH into oncoming traffic, the vehicle lost power steering functionality. The contact used excessive force to maneuver the vehicle. There were no warning lights illuminated. The contact became aware of NHTSA Campaign Number: 18V586000 (Steering). The dealer was contacted, and it was confirmed that the vehicle had previously been repaired under the recall and could not be repaired a second time under the recall. The vehicle had not been diagnosed or repaired. The manufacturer was made aware of the failure and confirmed that the VIN was no longer under recall. The failure mileage was 123,000.