Diagnostic Aids

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

When not in mobile PTO mode, heavy engine load may cause this code to be set.
Use a scan tool to observe the PTO inhibit and disengage history.