Powertrain

P2122 - THROTTLE / POST SENSOR PEDAL / SWITCH D

Table Of Contents

    Description of DTC code P2122 Generic

    Storing the P2122 OBD2 fault code means that the Powertrain Control Module (PCM) has detected that the Throttle Position Sensor (TPS) has a voltage that turns out to be excessively below a certain range. Depending on the vehicle model, that limit may be less than 0.17 to 0.20 volts. The “D” designation may correspond to a particular circuit, circuit area, or sensor.

    The reason for this code can be an open or short circuit. It is also possible that there is a loss of reference voltage.

    Symptoms of fault code P2122 Generic

    • The Check Engine light is on.
    • The engine may not start.
    • During the start of the engine, a large amount of black smoke is expelled from the exhaust.
    • Lack of acceleration.
    • Rough engine operation.

    Causes of OBD2 P2122 Generic

    The causes of the P2122 OBDII diagnostic code are

    • The Accelerator Position Sensor may not be installed correctly.
    • Damage to TPS Sensor related cables.
    • Perhaps the TPS Sensor circuit is shorted to ground.
    • The Throttle Position Sensor may be defective.

    Possible solutions of the DTC code P2122 Generic

    The steps to be followed before storing the DTC code P2122 OBD2 are the following:

    • Check the Accelerator Position Sensor next to its connector and its corresponding cables. Make the necessary repairs.
    • Check the voltage of the TPS Sensor. The reading obtained must match the one specified by the manufacturer. Excessively low voltage indicates sensor defects, requiring replacement if necessary.
    • If the TPS Sensor was recently replaced, make sure it is adjusted correctly. Refer to the service manual for recommendations on proper sensor installation.

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