Conditions for Running the DTC

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0601, P0602, P0604, P0606 and P2610 are not set.
The ignition is ON.
The ignition voltage is more than 9.5 volts.
DTCs P0641 and P0651 run continuously when the above conditions are met.