P0223 Mercedes-Benz Code - Throttle/Pedal Position Sensor/Switch 'B' Circuit High Input

P0223 indicates a problem with the throttle or pedal position sensor "B" circuit, specifically that it is reporting a high voltage input outside the expected range.

Common symptoms include reduced engine power, poor acceleration, the throttle not responding properly, the Check Engine Light illuminating, and the vehicle entering limp mode.

The P0223 code can be caused by a faulty throttle position sensor (TPS), damaged wiring or connectors in the TPS circuit, a malfunctioning accelerator pedal position sensor, or issues with the engine control module (ECM).

Driving with the P0223 code is not recommended, as the car may enter limp mode, limiting power, and creating potentially unsafe driving conditions. Immediate diagnosis and repair are advised.

A technician will use a diagnostic scanner to confirm the code, inspect the throttle and pedal position sensors, check for wiring or connector damage, and test the voltage signals to identify the issue.

Repairs may include replacing the throttle position sensor or accelerator pedal position sensor, repairing or replacing damaged wiring or connectors, and in rare cases, reprogramming or replacing the ECM.

Repair costs vary depending on the issue but typically range from $100 to $400 for sensor replacement, with additional labor costs if wiring repairs or ECM replacement are needed.

While unlikely, a weak or failing battery can sometimes cause voltage irregularities that may contribute to sensor-related issues. Testing the battery and charging system is a good step during diagnosis.

Yes, P0223 may appear alongside other throttle-related codes (e.g., P0220 or P0123), which can indicate additional problems with the throttle or pedal position sensors or circuits.

Regular maintenance, such as inspecting wiring for damage, ensuring sensors are clean and functional, and addressing any Check Engine Light warnings promptly, can help prevent recurrence of the P0223 code.