P2101 CHEVROLET - Throttle Actuator Position Performance
Tech notesThere is a factory service bulletin for the P2101 code on following Chevrolet vehicles:
2002-2009 Chevrolet Trail Blazer
2004-2012 Chevrolet Colorado
Factory Service Bulletin Chevrolet OBDII Code P2101
When is the code detected?The Engine Control Module (ECM) has detected an out of range condition between the predicted and actual throttle position.
P2101 Chevrolet DescriptionThe Engine Control Module (ECM) is the control center for the Throttle Actuator Control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. The TAC system uses the following circuits for Motor control 1 and Motor control 2.
Two processors are also used to monitor the TAC system data. Both processors are located within the ECM. Both processors monitor each other's data to verify that the indicated throttle position is correct.