The contact owns a 2015 GMC Denali. The contact stated while driving 35 mph, the vehicle downshifted and was unable to upshift into the higher gears. The contact stated no warning light was illuminated. The contact called the local dealer sterling Buick GMC (5853 frontage rd. I 49 South, opelousas, la 70570, (337) 942-3516) and made the dealer aware of the failure. The vehicle had not been diagnosed nor repaired as of yet. The manufacturer had not been informed of the failure. The failure mileage was approximately 148,000.

- Oberlin, LA, USA

Vehicle seems to be stuck in 4WD, unable to switch out of it. Cannot turn vehicle.

- Rochester, NY, USA

My truck has 30,000 miles and has the 'Chevy shudder'. why is this not a recall? GMC wants me to pay out of pocket for the transmission flush. When I am driving the truck it begins shuddering and shaking through certain shift points.

- Monroe, LA, USA

The vehicle will often shift unpredictably. Moving from a dead-stop, the vehicle will sometimes demonstrate significant hesitation (to shift) followed by a loud and violent engagement. In some instances the vehicle feels like it has been hit by another vehicle. The automobile will shudder and slip and jerk when it shifts between gears. The vehicle is unsafe to operate. The dealer can not fix the issue, but understands the vehicle problems.

- Tomball, TX, USA

Letter from senator feinstein inquiry on behalf of constituent in regards to having problems with GMC Sierra Denali pickup 2015. The consumer stated the vehicle has had multiple issues with the suspension, transmission, and electronics. The vehicle would ride rough and the stability light would illuminate. The transmission needed to be replaced. The electronic dash blacked out and would not function, the settigns switched on their own. The vehicle died and shifted dangerously. The manufaturer was notified. The consumer a fix was unavailable. Updated 08/09/2017

- Gold River, CA, USA