Throttle/Pedal Position Sensor/Switch B Circuit High
The throttle position sensor B is reporting a high voltage signal.
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What it means (plain English)
The throttle position sensor B is telling the engine computer that the throttle is open more than it should be, usually indicating a problem with the sensor or wiring.
What the computer is actually seeing
The engine control unit (ECU) receives a voltage signal from the throttle position sensor B. This signal should range from 0.5V (closed) to 4.5V (fully open). If the voltage exceeds 4.5V, it triggers P0223.
What a healthy reading looks like
Throttle position sensor B output voltage should be between 0.5V and 4.5V during normal operation.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check for any visible damage to the throttle position sensor B wiring and connectors. Reseat any loose connections.
- 2Using a multimeter, measure the voltage at the throttle position sensor B. It should be between 0.5V and 4.5V with the throttle closed and fully open. If not, replace the sensor.
- 3Inspect the circuit for shorts to power or ground. If voltage exceeds 4.5V at the sensor, check the wiring for shorts. Repair any damaged wires and retest.
- 4If the sensor and wiring check out, inspect the ECM for any faults or errors stored. Consider reprogramming or replacing the ECM if necessary.
Common causes
- Faulty throttle position sensor B
- Short circuit in wiring to sensor
- Faulty engine control module (ECM)
- Poor electrical connection at the throttle position sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with a P0223 code?
It's advisable to fix this soon. While you can drive, the throttle response may be erratic, affecting safety.
Will the problem come back after clearing the code?
If the underlying issue isn't fixed, the code will likely return. Make sure to rule out all possible causes.
Why might this code pair with P2121?
Both codes relate to throttle position sensors, where the signal from one or both sensors can trigger errors when there's a discrepancy.
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