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.
- The ECM detects a PWM signal greater than 65 percent for 5 seconds during the KEY ON test.
- The ECM detects a PWM signal less than 5 percent for 15 seconds during the RUN test.