Conditions for Setting the DTC
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
P251A
- The PTOM detects a high voltage signal on one or more of the in-cab PTO switch circuits: SET -, RES +, 1 or 0.
- The above condition is present for greater than a predetermined time threshold.
- This code moves to history after 90 seconds.
P251E or P251F
- The PTOM detects that the PTO engine shutdown signal circuit is above or below a predetermined voltage threshold.
- The above condition is present for greater than a predetermined time threshold.