P0225 Throttle/Pedal Position Sensor/Switch C Circuit Malfunction

P0225 indicates a throttle or pedal position sensor C circuit malfunction. A third redundant position input is invalid or unavailable.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the controller before proving the sensor C reference, ground, and signal path are valid.

Symptoms of P0225

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0225

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Compare sensor C with other throttle or pedal tracks during a slow sweep and verify correlation across the full travel.
Check sensor C reference voltage, ground, signal, connector condition, harness continuity, and module input behavior.
Inspect pedal or throttle assembly connectors, water intrusion, wire strain, and related throttle correlation or limp-mode codes.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.