P0123 Throttle/Pedal Position Sensor A Circuit High Input
What does P0123 mean?
P0123 — Throttle/Pedal Position Sensor A Circuit High Input. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects throttle/pedal position sensor a circuit high input. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0123
- Faulty throttle position sensor
- Shorted TPS signal circuit to voltage
- Poor sensor ground connection
- Corroded or damaged connector
- PCM fault
How to fix P0123
- Inspect TPS wiring for shorts to power and connector damage
- Check sensor ground circuit integrity
- Compare TPS voltage to specified idle and WOT values on an OBD-II scanner
- Test the sensor resistance across its range
- Replace the TPS if the circuit tests confirm a failure