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.
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
PTO Engage Signal
1
1
P253D
1
1. Power Take-Off (PTO) Does Not Increase With Power Take-Off Engaged