The truck had 8 glow plugs replaced.

- South Amboy, NJ, USA

The contact owns a 2017 GMC Sierra 2500. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. Additionally, the contact stated that the transmission was slipping. The vehicle was taken to the dealer to be diagnosed. The vehicle was diagnosed with transmission failure and the contact was informed that the transmission needed to be replaced. The vehicle was being repaired by an independent mechanic. The manufacturer was not made aware of the failure. The failure mileage was approximately 46,000. The VIN was unavailable.

- Aberdeen, WA, USA

On December 29, 2022 I stopped at the bank for 2 minute and when I got back to my truck I noticed smoke coming out from under the hood. I immediately called 911 and luckily some nice people were able to get my hood up safely and the bank provided a fire extinguisher before the fire trucks arrived. It was engulfed in flames. The fireman said it appeared the fire started in the wiring at the engine. I had a recall fixed a while back for the engine block heater so I was worried maybe they didn-??t repair the recall. A week after the fire I received a 2nd recall in the mail for the same recall. Today is July 9th and my truck is still in the shop waiting on parts that have been on back order this whole time. GMC told my insurance company they were sending someone down to look at it. Never heard anything back. This could have been so bad had I been driving it when the fire started. So here I am going on 7 months without my truck all while paying $942/month. I just want something to be done to speed up the repairs that my insurance has paid. Estimate is $22,000

- Seminary, MS, USA

My 2017 GMC 2500 Sierra denali duramax has had this throttle issue, it seems to only do it when the exhaust stinks, and at speeds between 5 - 55 mph. If I take my foot off the accelerator the truck maintains RPM (1200 - 1400) or even has increased some and has lasted 2 - 5 seconds (estimated and greatly reduces the effectiveness of the braking capacity and responsiveness/stopping distance). Worst was with a huge trailer behind and I got up to speed 55 on county hwy 8, and I let off the accelerator and it kept going hard and I got on the brakes and I couldn't slow it down until the truck decided to release off the throttle.(two witnesses in the vehicle, one a GM tech, stating your vehicle is not safe and needs to be looked at) it's happened about 25 times in 5700 miles in various settings & speeds and has occurred frequently in town at speeds of 25 - 35 mph. There maybe several hundred miles in between episodes if you will, as they occur in clusters when exhaust stinks and gone when exhaust does not stink. Truck also had torque converter not unlock and [xxx] near choked the engine off at stop sign right after a throttle stuck condition. Got home the other night and fuel gauge stopped working! back up camera is daylight bright at night, low coolant issues, map sensor issue, engine surged the other day, what next" it's constantly been at dealerships with no answers. My wife won't drive it anymore and wishes I wouldn't either fearing it will cause an accident and she's probably right. GM has stated they are aware of the problem but will not provide any trade in assistance dollars to get it off the road and there is no fix. $70,000+ truck, lives at risk and no serious response from GM" parts of this document have been redacted to protect personally identifiable information pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Wausau, WI, USA