P0220: Throttle/Pedal Position Sensor/Switch B Circuit Malfunction

What does P0220 mean?

The B position-sensing circuit has a fault. Many electronic throttle systems use redundant position inputs; B names a monitored channel, not bank 2 or a universal connector location.

Generic OBD-II definition: Throttle/Pedal Position Sensor/Switch B Circuit Malfunction. Confirm applicability in your vehicle service information.

Common causes

• Faulty B position sensor
• Corroded connector or chafed wiring
• Mechanical binding or sensor installation issue

Symptoms

• Poor idle quality
• Hesitation or stalling
• Reduced-power warning

Diagnostic focus

The two channels do not always increase in the same direction or at the same voltage. Use the specified relationship instead of expecting identical readings.

Can I keep driving with P0220?

Severity: High Unreliable throttle response can be dangerous. Do not continue driving with surging, stalling, or reduced acceleration that makes traffic unsafe; arrange recovery instead. Do not force an electronic throttle plate.

If the check engine light is flashing or the car runs badly, stop driving and have it checked.

Typical fixes

• Locate the B channel in the service information
• Check its supply, ground, and signal
• Compare A and B position traces using the manufacturer relationship

Sources & review

• OBD-Codes.com: P0220
• TroubleCodes.net: generic code definitions

Definitions and diagnostic background checked 2026-11-06. Generic guidance, not a substitute for the service procedure for your exact year, engine, and transmission.