Conditions for Running the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The engine is running.
DTC P018C, P018D, 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.
The engine has been running for at least 5 seconds.