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 P0606, P2108 and U0107 are not set.
The ignition switch is in the CRANK or RUN position.
The ignition voltage is more than 5.23 volts.
The communication between the TAC module and the PCM must be valid.