P2108 CHEVROLET Throttle Actuator Control Module Performance

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 notes
There is a factory service bulletin for the P2108 code on following Cadillac vehicles:

2006-2007 Chevrolet Avalanche
2006-2007 Chevrolet Express 1500/2500/3500
2006-2007 Chevrolet Silverado
2006-2007 Chevrolet Silverado Flex Fuel
2006-2007 Chevrolet Silverado Hybrid
2006-2007 Chevrolet Silverado SS
2006-2007 Chevrolet Silverado 2500/3500 HD
2006-2007 Chevrolet Suburban
2006-2007 Chevrolet Tahoe

Factory Service Bulletin Chevrolet OBDII Code P2108

When is the code detected?
The Throttle Actuator Control (TAC) module is unable to write or read data from the Random Access Memory (RAM)
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– No throttle response
P2108 CHEVROLET Description
The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. The TAC module continuously test the integrity of this data. When the TAC module is unable to write or read data to and from Random Access Memory (RAM), or the TAC module is unable to correctly read data from the flash memory or and internal TAC module processor fault is detected and the Detected Trouble Code (DTC) is set.
CHEVROLET Technical Service Bulletins for P2108 code
2006 CHEVROLET W-SERIES POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2007 CHEVROLET W-SERIES POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2006 CHEVROLET AVALANCHE 1500 ENGINE AND ENGINE COOLING:ENGINE
2006 CHEVROLET AVALANCHE 2500 ENGINE AND ENGINE COOLING:ENGINE
2006 CHEVROLET EXPRESS 1500 ENGINE AND ENGINE COOLING:ENGINE
2006 CHEVROLET EXPRESS 2500 ENGINE AND ENGINE COOLING:ENGINE
2006 CHEVROLET EXPRESS 3500 ENGINE AND ENGINE COOLING:ENGINE
2006 CHEVROLET SILVERADO 1500 ENGINE AND ENGINE COOLING:ENGINE
2006 CHEVROLET SILVERADO 2500 ENGINE AND ENGINE COOLING:ENGINE
2006 CHEVROLET SILVERADO 3500 ENGINE AND ENGINE COOLING:ENGINE