Conditions for Setting the DTC
WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The EBCM detects the voltage on the 5 V reference circuit to the brake master cylinder piston position sensor, steering angle sensor and brake master cylinder piston position sensor is less than 4.8 V or greater than 5.2 V.