Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0122, P0123, P0222, P0223, P0641, P0651, P2100, P2122, P2123, P2127, P2128, P2135, P2138, P2176, or U0107 are not set.
The ignition is ON.
The battery voltage is more than 8.0 volts.
DTC P2108 runs continuously once the above conditions are met.