2021 GMC Sierra 1500 fuel system complaints

Filed Sep 1, 2021 · Engine, Fuel system · OH

The truck has 7500 miles on it and the check engine light keeps coming on then goes back off. It is impossible to schedule service as the light goes off before it gets to dealer. The when driving the truck many times the check engine light will flash for a minute or so and then remain on steady. This is very frustrating and the dealer has found nothing. It has happened probably 10 times since the truck was new and continues now. The truck was just serviced and the dealer found nothing causing this.

Filed Feb 19, 2021 · Engine, Fuel system · 2,500 miles · OK

While driving during winter conditions with temperature at 3 degrees on a residential street with limited traffic, the diesel fuel in the fuel filter gelled up which caused the vehicle to display reduce power mode and then immediately shut off and would not start. The vehicle coasted to a stop in the middle of the street while in traffic. The owners manual lists utilizing top tier diesel which I did. While additives are not normally needed in most states to fuel for freezing conditions evidently they are needed in oklahoma. The fuel filter housing is the only place where the fuel gelled up, which appears to be a theme in most gmc diesel trucks and does not effect fuel in the fuel tank due to volume. Gmc has done nothing to improve the design or increase insulation to the thin fuel filter housing. If I had been in fast traffic on the interstate it would have resulted in an accident and possible loss of life.