Conditions For Running DTC

WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. 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: P1120, P1220 and P1221.
The following DTCs are not active at the same time: P1120 and P1220.
The engine operates longer than 1 second.
The engine speed is greater than 500 RPM.