Conditions for Setting the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The PSCM detects open, short to ground or short between any of the motor rotational sensor circuits.
The PSCM detects the steering wheel angle is outside the valid range of -720 to +720 degrees.