Throttle/Pedal Position Sensor B Circuit High Input
Fix P0223 throttle/pedal position sensor B code. Learn about dual TPS circuits and how to diagnose a high signal.
What you may notice
Symptoms
- 01Check engine light on
- 02Reduced power or limp mode
- 03Hesitation or surging
- 04Unresponsive throttle
- 05Erratic idle
Where to look first
Common causes
- 01Faulty accelerator pedal or throttle sensor
- 02Short to voltage in the wiring
- 03Damaged connector or corrosion
- 04Bad ground or reference voltage
- 05ECM fault (rare)
Step by step
What to check and repair
- 01Inspect sensor wiring for shorts to voltage
- 02Check the connector for damage and corrosion
- 03Verify reference voltage and ground
- 04Test both sensor channels through their range
- 05Replace the pedal or throttle sensor if faulty
What Does P0223 Mean?
The P0223 code indicates that the "B" throttle or accelerator pedal position sensor circuit is reading higher than expected. Electronic throttle systems use redundant sensors for safety, and B is the second channel.
Why There Are Two Sensors
Drive-by-wire systems use two position signals that track each other. If one disagrees or reads out of range, the ECM sets a code and often enters reduced-power mode.
Common Causes
A faulty pedal or throttle sensor, wiring shorts, or connector problems are typical. A short to voltage will push the signal high.
How AI4Car Helps
AI4Car can show both throttle/pedal sensor signals, helping you confirm whether channel B is tracking correctly with channel A.