Symptoms of this code include an illuminated Check Engine Light, vehicle that does not start, no acceleration, and automatic transmission that does not shift. The most common cause of this code is a programming error, but it can also be caused by a bad manifold absolute pressure sensor, engine vacuum leak, or throttle bore that has caked carbon deposits. In conclusion, the P2176 code is a diagnostic trouble code that refers to a problem with the throttle body actuator/motor and has failed to learn the correct position at which the butterfly valve within the throttle body should be in order to produce a smooth idle for the engine. P0123 - Throttle Position Sensor/Switch A Circuit High Input Conclusion P2173 - Throttle Actuator Control System - Vacuum Leak Detected P2177 - Throttle Actuator Control System - Idle Position Not Learned (Bank 2)
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