P0222: Throttle/Pedal Position Sensor/Switch B Circuit Low. Meaning, possible symptoms and checks before repair.
Meaning, symptoms, causes and checks
The controller detects an excessively low electrical input for throttle/pedal position sensor or switch channel B. The letter identifies a manufacturer-defined circuit, not necessarily a separate part. The limit concerns the electrical input, not directly how far the pedal is pressed.
Affected system: Powertrain
Symptoms
- Delayed, limited or absent accelerator response.
- Engine warning light and possible limp mode; idle may become uneven.
Possible causes
- Signal shorted to ground, missing reference supply or poor contact.
- Failed sensor; an open circuit, depending on the input design.
What to check
- Use the wiring diagram to identify channel B: throttle, pedal or switch; read accompanying faults on the other channels.
- Inspect channel B’s connector, terminals and harness; test reference supply and ground using the OEM pin assignment.
- Measure signal B at the sensor and module; investigate shorts to ground or loss of reference as directed by the OEM.
- Check installation and mechanical travel after identifying the component; perform adaptation only when the repair procedure requires it.
- After repair, clear codes and recheck channel B under the original recorded conditions, following the manufacturer’s procedure.
Also written as: P0222-00, P022200, PO222 (some scan tools add the fault-type byte, e.g. -00).