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
– Throttle Actuator Control (TAC) module harness is open or shorted
– Throttle Actuator Control (TAC) module circuit poor electrical connection
When is the code detected?
The Engine Control Module (ECM) has detected an out of range condition between the predicted and actual throttle position.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– No throttle response
– No throttle response
P2101 BUICK Description
The 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.
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.
BUICK Technical Service Bulletins for P2101 code
2007 BUICK ALLURE ELECTRICAL SYSTEM
2007 BUICK ALLURE DIGITAL INSTRUMENT PANEL
2007 BUICK LACROSSE ELECTRICAL SYSTEM
2007 BUICK LACROSSE DIGITAL INSTRUMENT PANEL
2008 BUICK ALLURE ELECTRICAL SYSTEM
2008 BUICK ALLURE DIGITAL INSTRUMENT PANEL
2008 BUICK LACROSSE ELECTRICAL SYSTEM
2008 BUICK LACROSSE DIGITAL INSTRUMENT PANEL
2009 BUICK ALLURE ELECTRICAL SYSTEM
2009 BUICK ALLURE DIGITAL INSTRUMENT PANEL