Diagnostic Aids
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
The accessory DC power control module Data List on the scan tool contains the parameter 42V Circuit Maximum. If this parameter has a voltage that is greater than 50 V, and the accessory DC power control module is functioning normally, the protection circuits in the power steering control module have failed allowing induced voltage to be present on the 42 V circuit.