Yukon XL 2500 4WD V8-6.0L VIN N (2006)
4
Select a smooth, dry, clean, and level road or large lot that is as free of traffic and obstacles as possible.
5
Drive the vehicle and maintain a speed of at least 16 km/h (10 mph) for at least 5 seconds.
6
Stop the vehicle and check to see if the ABS indicator or the traction assist indicator is illuminated.
7
If an indicator is illuminated, refer to Diagnostic Starting Point - Antilock Brake System. See: Antilock Brakes / Traction Control
Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview