Sierra 3500 4WD V8-6.6L DSL Turbo VIN 2 (2004)
module commands the TAC motor to increase or decrease the engine RPM.
TAC Motor
The TAC motor is part of the throttle body and controls the positions of the throttle. The motor is bi-directional and is controlled by the TAC module.
The TAC motor increases or decreases the engine RPM.
