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OBD-II · Engine and powertrain (P)

P0222

Throttle/pedal position sensor B circuit low

What it means

The position sensor B signal voltage is below its valid range.

Symptoms

  • reduced power or limp mode (EPC light on VW group cars)
  • poor or no response to the accelerator
  • raised or unstable idle
  • engine warning light

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01signal wire short to ground or open circuit
02missing 5 V reference
03failed sensor in the throttle body
04corroded or loose connector

What to check, step by step

  1. 01Check the battery voltage and charging: low voltage can upset electronic throttle signals
  2. 02Inspect the throttle body connector and wiring for corrosion, oil or broken pins
  3. 03Check the 5 V reference, ground and both position signals with a meter or scope
  4. 04Watch both throttle position signals in live data while the throttle moves: they should change smoothly without dropouts
  5. 05Replace the throttle body (the sensors are usually built in) and run the throttle adaptation