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P2135Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation

What it means

The two throttle position signals don't agree with each other. The ECU can't trust the throttle position and goes into limp mode.

Symptoms

  • Limp mode with very limited power
  • Electronic throttle warning light

Common causes

  • Worn throttle position sensor track
  • Corroded connector or wiring fault on one signal
  • Water in the throttle body connector

What to check first

  1. Graph both signals while opening the throttle slowly (they should mirror each other smoothly)
  2. Check the connector and wiring
  3. Replace the throttle body if one track has dead spots
Can I drive with P2135? Not recommended. P2135 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 P2135

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

Known engine problems that set P2135

Volvo 5-cyl petrol: Electronic throttle module failure (older cars)Volvo, Ford · typically 80,000–180,000 km

Cases with P2135 (0)

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P2135: questions and answers

What does P2135 mean?

P2135: Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation. The two throttle position signals don't agree with each other. The ECU can't trust the throttle position and goes into limp mode.

What are the symptoms of P2135?

Limp mode with very limited power. Electronic throttle warning light.

What causes P2135?

Worn throttle position sensor track. Corroded connector or wiring fault on one signal. Water in the throttle body connector.

How do you diagnose P2135?

1. Graph both signals while opening the throttle slowly (they should mirror each other smoothly) 2. Check the connector and wiring 3. Replace the throttle body if one track has dead spots

Can I drive with P2135?

Not recommended. P2135 can lead to stalling, limp mode or engine damage; diagnose it before driving further.