A heavily touted feature on 2011 Heavy Duty Chevy Silverado and GMC Sierra trucks is the Hill-Start Assist. The feature is designed to ensure that trucks, in particular those towing trailers, would assist drivers on an incline.
The feature is supposed to keep braking for nearly two seconds after the pedal has been released, but there have been reports of trucks not braking and of trucks rolling, according to PickupTrucks.com.
GM has since issued a recall and said the malfunction was due to improper software calibration. All new trucks have been fixed and the company continues to work to have the issue corrected in purchased trucks.