P2122 - THROTTLE / POST SENSOR PEDAL / SWITCH D
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.