Conditions for Setting the DTC: P2107
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The TAC module detects low voltage, a fault with the EEPROM, or the vehicle ID recorded in the TAC module does not match the vehicle ID recorded in the PCM.