Circuit Description
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
When the engine is ON, the rear wheel steering control module monitors the position of the front and rear wheels. When the system is commanding a rear wheel angle and, due to mechanical binding, the rear actuator does not achieve the desired position a servo error fault is generated, thus setting a DTC C0543.