P2135 - THROTTLE / PEDAL POSITION SENSOR / SWITCH A / B VOLTAGE CORRELATION

POST UPDATED IN February, 2023

Description of DTC code P2135 Generic

The problem code P2135 OBDII shows that the Powertrain Control Module (PCM) has encountered an erroneous reading on the voltages transmitted by the Throttle Position Sensor (TPS) A or B.

The Accelerator Position Sensors are located at the entrance of the throttle body. Their voltage outputs must remain close to each other within a certain range. Therefore, the PCM will constantly compare both readings to test their efficiency and timeliness.

Individually, each Accelerator Position Sensor will send the PCM a voltage signal in correlation with the position of the throttle plate. This signal is interpreted by the PCM as the percentage of the throttle opening. This code is set if one TPS Sensor is reading at half throttle and the other sensor is reading at full throttle.

Symptoms of fault code P2135 Generic

  • The Check Engine light turns on.
  • Vehicle blocking.
  • Great loss of energy.
  • Problems during acceleration.
  • Higher than normal

Causes of OBD2 P2135 Generic

The reasons to set the DTC code P2135 OBD2 are as follows:

  • There may be a bad electrical connection or corroded terminals on the throttle body.
  • Problems with the throttle body cover.
  • The throttle body may be defective.
  • Since there is no correlation between the TPS sensors, the computer needs to cycle its re-learning phase to restore the active response to the throttle body.

Possible solutions of the DTC code P2135 Generic

To solve the problems that accompany the diagnostic code P2135 OBDII, you must do the following:

  • Get the Service Bulletins that apply to your vehicle model.
  • If there are other codes stored, you must diagnose those codes.
  • Note the connector terminals on the throttle body. Look for corrosion on them. Change if necessary.
  • Use a voltmeter to test the Accelerator Position Sensor. There should be 5 volts of reference and a variable signal. Then, start the vehicle and slowly press the pedal. The voltage should increase slightly. If the voltage does not increase or there is no voltage present on the cable, change the TPS Sensor.

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