Description of DTC code P2122

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

  • 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

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

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.

Codes related to P2122

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