Conditions for Running the DTC

WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The engine speed is 0 RPM.
The ignition is ON, with the engine OFF.
The ignition 1 voltage is more than 10.5 volts.
The above conditions are met for more than 1.0 second.
DTC P0629 runs continuously once the above conditions are met.