Conditions For Running DTC

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Suburban, and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0601, P0602, P0604, P0606, P1515, P1516, P1517, or P1518 are not set.
The following DTCs are not active at the same time: P0120, P0220 and P2135.
The following DTCs are not active at the same time: P0120 and P0220.
The engine operates longer than 1 second.
The engine speed is greater than 500 RPM.