P0222
Throttle/Pedal Position Sensor/Switch "B" Circuit Low Input
The B channel voltage is below the lower diagnostic threshold, suggesting an open circuit, short to ground, or sensor element failure on track B.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Common causes
Ordered by how often each turns out to be the cause.
- TPS B circuit open or shorted to groundCommon
- Wiring or connector faultPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Throttle Position Sensor B
- TPS Wiring
P0222 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.