Conditions for Setting the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The index marker pulse data parameter is high for less than 20 degrees of the steering wheel angle.
The index marker pulse data parameter is high for greater than 20 degrees of the steering wheel angle.
The index marker pulse data parameter is high when the steering wheel angle parameter is greater than +90 degrees.
The index marker pulse data parameter is high when the steering wheel angle parameter is less than -90 degrees.
The steering wheel position sensor phase A circuit is shorted to ground, open or shorted to voltage.
The steering wheel position sensor phase B circuit is shorted to ground, open or shorted to voltage.
The index marker pulse is shorted to ground, open or shorted to voltage.