P2138 - P2138 - THROTTLE / PEDAL POSITION SENSOR / SWITCH D / E VOLTAGE CORRELATION

POST UPDATED IN April, 2021

Description of DTC code P2138 Generic

The electronic throttle control is a system composed of the Throttle Position Sensor (TPS), a throttle body electronically controlled by an internal motor, two throttle position sensors used for correlation factors, and the engine management module.

When the accelerator pedal is depressed, a sensor indicates the desired amount of throttle opening. That information is sent to the Powertrain Control Module (PCM). In response, the PCM sends a voltage to the electric motor, which opens the throttle plate. Besides, two-position sensors are located in the throttle body, which converts the amount of throttle opening into a voltage signal.

The PCM constantly observes the correlation between the two voltages. When the voltages match, the system operates correctly. But if there is a difference in the voltages for a few seconds, the DTC P2138 OBDII code is set.

Symptoms of fault code P2138 Generic

  • Check Engine light ON.
  • The vehicle may fail to start.
  • Motor stalling.
  • Deficiencies during acceleration.
  • Sudden loss of power.

Causes of OBD2 P2138 Generic

Reasons for setting the P2138 OBD2 trouble code are:

  • Deficiencies in electrical connections due to bad throttle body wiring or connectors.
  • The throttle body gears do not rotate properly due to damage to the top cover.
  • Defects in the throttle body.
  • The Throttle Position Sensor may be damaged.

Possible solutions of the DTC code P2138 Generic

To solve the P2138 OBDII diagnostic code, take into account these suggestions:

  • Check if the Technical Service Bulletins have the solution for this code.
  • Check the connector and its terminals. Make sure they are not corroded. Repair as needed.
  • Inspect the throttle body and pay attention to the top cover. If you find defects with the cover you should replace it. Replace the throttle body if necessary.
  • Replace the Throttle Position Sensor.

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