Hill Start Hold

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Some vehicles are equipped with the Hill Hold Start technology feature. When stopped on a hill, the Hill Start Hold feature prevents the vehicle from rolling before driving off, whether facing uphill or downhill by holding the brake pressure during the transition between when the driver releases the brake pedal and starts to accelerate. The Electronic Brake Control Module calculates the brake pressure, which is needed to hold the vehicle on an incline or grade greater than 5% and locks that pressure for up to two seconds by commanding the appropriate solenoid valves ON and OFF when the brake pedal is released. The stop lamps will stay illuminated during the Hill-Hold operation even though the brake pedal is released, this is considered normal operation.

The Hill Start Hold feature is determined by the electronic brake control module using the following inputs:

Accelerator pedal position sensor
Brake pedal position sensor
Multi-axis acceleration sensor