Possible causes – Faulty Throttle Actuator Control (TAC) module– Throttle Actuator Control (TAC) module harness is open or shorted– Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires) Tech description There is a factory service bulletin for the P2108 code on following Cadillac vehicles: 2006-2007 Chevrolet Avalanche2006-2007 Chevrolet Express 1500/2500/35002006-2007 Chevrolet…