Chevy cobalt 2006 code p21768/5/2023 Both processors monitor each other's data to verify that the indicated throttle position is correct. Both processors are located within the ECM. Two processors are also used to monitor the TAC system data. The effected vehicle may present symptoms of reduced power mode, stored. The TAC system uses the following circuits for Motor control 1 and Motor control 2. 940 98K views 3 years ago In this video I highlight a common problem effecting 2006-2018 GMC Chevy and Cadillac vehicles. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. CAUSE: Terminal 51 at X3 Connector of Under Hood Fuse Block loose terminal tension with arcing corrosion on terminal 51 on fuse block. The ECM determines the drivers intent and then calculates the appropriate throttle response. CONDITION: Customers may comment of intermittent Service Engine Soon light on with Reduced Engine Power and/or engine stall with P0689 and/or P1682 stored in history. If the throttle body is cleaned without performing an 'idle learn reset/reset idle learn' with the Tech 2, the ECM/PCM may continue to compensate for previous carbon build up, causing it to return with a similar concern as well as DTCs P0121, P0506, and/or P0507. The Engine Control Module (ECM) is the control center for the Throttle Actuator Control (TAC) system. Throttle plate sticking due to carbon build-up Throttle Actuator Control (TAC) module circuit poor electrical connection Throttle Actuator Control (TAC) module harness is open or shorted This is a tricky system to diagnose on a GM. It opens the throttle based on the two PPS sensor located on the gas pedal. Since this is a drive by wire setup the throttle body uses two TPS sensors to determine the throttle plate position. 2007 chevy cobalt 2.2L Ecotch 4 cylnder, Engine code engine poor reduced performance code P2176. If the head cannot be repaired, it will need to be replaced. The cylinder head would need to come off, the valves cleaned or replaced, and the valve seats repaired. The P2176 code is set when the difference between the predicted and the actual throttle position is more than a calibrated amount for more than 1.5 seconds.įaulty Throttle Actuator Control (TAC) module 5,332 Answers The throttle position sensor is the throttle body. This will give a misfire and lean AT IDLE ONLY.
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