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P2138Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation

What it means

The two accelerator pedal signals don't agree with each other.

Symptoms

  • Limp mode
  • No response to the accelerator pedal

Common causes

  • Worn pedal sensor
  • Wiring or connector fault
  • Poor ground

What to check first

  1. Graph both pedal signals while pressing slowly
  2. Check the connector and grounds
  3. Replace the pedal assembly if one track has dead spots
Can I drive with P2138? Not recommended. P2138 can lead to stalling, limp mode or engine damage; diagnose it before driving further.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

How to test the parts behind P2138

Throttle and accelerator pedal position sensorsWiring, typical values, multimeter and scope tests

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P2138: questions and answers

What does P2138 mean?

P2138: Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation. The two accelerator pedal signals don't agree with each other.

What are the symptoms of P2138?

Limp mode. No response to the accelerator pedal.

What causes P2138?

Worn pedal sensor. Wiring or connector fault. Poor ground.

How do you diagnose P2138?

1. Graph both pedal signals while pressing slowly 2. Check the connector and grounds 3. Replace the pedal assembly if one track has dead spots

Can I drive with P2138?

Not recommended. P2138 can lead to stalling, limp mode or engine damage; diagnose it before driving further.