Throttle/Pedal Position Sensor/Switch B Circuit High
What does P0223 mean?
The P0223 code means the vehicle's onboard diagnostic system has detected: Throttle/Pedal Position Sensor/Switch B Circuit High. This is a moderate severity code.
Common Symptoms
- Engine enters limp mode or reduced power mode
- Unstable or surging idle
- Check Engine Light illuminated
- Throttle does not respond to pedal input
- Engine may rev unexpectedly
Probable Causes (Ranked by Likelihood)
- Open circuit in TPS B ground wire Very High
- Short to voltage in TPS B signal circuit High
- Faulty throttle position sensor B High
- Damaged wiring harness between TPS and PCM Moderate
- Failed PCM/ECM Low
Step-by-Step Diagnostic Procedure
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Read TPS B voltage with a scan tool -- a reading above 4.8V at closed throttle indicates a high circuit fault
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Check continuity of the TPS B ground wire from sensor connector back to PCM
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Inspect TPS connector for water intrusion, corrosion, or loose terminals
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Test TPS B signal wire for shorts to the 5V reference circuit using a multimeter
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Replace TPS or throttle body if sensor is confirmed faulty after wiring checks pass
Frequently Asked Questions
Can I drive with code P0223?
You can drive short distances, but the vehicle will likely be in limp mode. The engine may also rev unexpectedly, which can be dangerous. Repair as soon as possible.
What does a high TPS B circuit mean?
It means the PCM is reading a voltage from the TPS B sensor that is higher than the expected range. This is usually caused by an open ground wire or a short to voltage in the signal circuit.
Can I just clean the throttle body to fix P0223?
Cleaning alone is unlikely to fix a high circuit code. The problem is typically electrical -- a wiring fault or sensor failure rather than a mechanical restriction.