P0220 Throttle/Pedal Position Sensor/Switch B Circuit Malfunction

P0220 indicates a throttle or pedal position sensor B circuit malfunction. The redundant throttle input is not providing a valid signal.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the throttle body or pedal assembly before checking reference, ground, and correlation data.

Symptoms of P0220

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0220

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Compare throttle or pedal sensor B with sensor A and other redundant tracks while slowly sweeping the pedal or throttle.
Check reference voltage, ground, signal voltage, connector fit, wiring continuity, and correlation with commanded throttle position.
Inspect throttle body or pedal connector corrosion, harness strain, water intrusion, and related reduced-power or throttle codes.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.