Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0107 is not set.
The ignition switch is in the Crank or Run position.
The ignition voltage is greater than 5.23 volts.
The communication between the TAC module and the powertrain control module (PCM) must be valid.
DTC P2108 runs continuously once the above conditions are met.