Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
P0403
- The ECM detects an electrical malfunction on an EGR motor control circuit.
- The above condition is present for more than 4 seconds.
P046C
- The difference between the actual EGR position and the desired EGR position is more than 3 percent.
- The above condition is present for more than 10 seconds.