Hill Start Aid (HSA)

Detroit transmissions are equipped with a Hill Start Aid (HSA) feature to prevent rolling backward when launching the vehicle on an uphill grade. The system delays the release of service brakes until enough torque is available to begin moving the vehicle forward. The system will hold the brakes for a maximum of 3 seconds. If driveline torque is not detected, the system will audibly alert the driver and release the brakes.

HSA has an extension called the hold function, that eases the strain of driving in stop-and-go traffic. For information, see 'Hold Function.'