P2176 BUICK - Minimum Throttle Position Not Learned
Tech notesThere is a factory service bulletin for the P2176 code on following Buick vehicles:
2004-2007 Buick Rainier
Factory Service Bulletin Buick OBDII Code P2176
When is the code detected?The P2176 code is set whe the difference between the predicted and the actual throttle position is more than a calibrated amount for more than 1.5 seconds.
P2176 Buick 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.
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