Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

The engine is running and the fuel pressure is within normal operating range.
DTC P0231, P0232, P023F, P064A, P1255 or P06A6 are not active.
DTC P0641 has not failed this ignition cycle.
Fuel pump control is enabled and the fuel pump control state is normal.