How much does it cost to fix P0223?

DIY repair typically costs $25–$200 for parts. Professional repair runs $150–$550 including parts and labor.

P0223

Powertrain

High

Throttle/Pedal Position Sensor/Switch B Circuit High

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Code P0223 means the powertrain control module (PCM) has detected that the Throttle/Pedal Position Sensor B circuit voltage is above the maximum expected threshold. The TPS B signal normally ranges from about 0.5V at closed throttle to approximately 4.5V at wide-open throttle. When the PCM reads a voltage exceeding approximately 4.8V, or a voltage that's significantly higher than what sensor A indicates, this code is stored.

This code is considered more urgent than a low-circuit code (P0222) because a high reading can indicate the PCM believes the throttle is being opened when it shouldn't be. While modern vehicles have safeguards against unintended acceleration (the PCM will immediately enter limp mode and may cut fuel), the underlying condition should be addressed promptly. You may notice the engine surging or idling high before the PCM activates limp mode.

The most common causes are a short in the wiring harness where the TPS B signal wire contacts the 5V reference wire, or an internal sensor failure. Use a scan tool to monitor TPS B voltage with the ignition on and engine off — it should read about 0.5V with the throttle closed. If it's near 5V, disconnect the sensor and check if the voltage drops. If it does, the sensor is faulty. If the voltage stays high with the sensor disconnected, the wiring has a short to voltage that needs to be traced and repaired. Do not drive with this code beyond what's absolutely necessary to reach a repair facility.

Severity

High — Immediate AttentionWithin 24 Hours

Symptoms

•Check Engine light is on
•Vehicle enters limp mode immediately
•Engine may surge or race unexpectedly
•Very limited acceleration and power
•Idle speed may be erratic or high
•Throttle does not respond to pedal input correctly

Likely Causes

Faulty throttle position sensor B with high output35%

The TPS B sensor has failed in a way that produces a voltage reading higher than the PCM expects for the current throttle position, falsely indicating the throttle is open.

Short to voltage in TPS B signal wire30%

The TPS B signal wire has shorted to the 5V reference wire or another voltage source, causing the PCM to read an abnormally high voltage regardless of throttle position.

Corroded or shorted connector20%

Moisture intrusion or corrosion in the TPS connector has created a short between the signal pin and the reference voltage pin.

Failed accelerator pedal position sensor15%

The B circuit sensor in the accelerator pedal assembly is outputting an abnormally high voltage, which the PCM interprets as excessive throttle demand.