P0225
Throttle/Pedal Position Sensor/Switch "C" Circuit
- Severity
- High
- Driving
- Drive only to a garage
A fault in throttle or pedal position sensor "C". On a drive-by-wire car there is no cable between the pedal and the throttle - the module reads pedal position electronically and moves the throttle to match. Because the module cannot safely guess what the driver wants, a fault here usually triggers a reduced-power mode.
Possible causes
- CommonFailed throttle or pedal position sensor
- CommonDamaged wiring or connector at the sensor
- PossibleCarbon build-up on the throttle plate holding it off its stop
- PossibleCorroded connector letting water in
- RareControl module fault
What you might notice
- Sudden loss of power, or the engine refusing to rev beyond a low limit
- Warning light on, often with a separate throttle or power warning
- Erratic idle
- Poor or unpredictable throttle response
- Sometimes the engine will not start
What to check, in order
- Be careful where you drive with this fault. A reduced-power mode can engage without warning, which is dangerous when overtaking or joining fast-moving traffic.
- Inspect the connector at the sensor for corrosion, water and spread terminals.
- Watch the pedal and throttle position values on the live data screen while pressing the pedal slowly. Both should rise smoothly - a dropout or a flat spot identifies the fault.
- Check the wiring for chafing where the harness passes the engine or bulkhead.
- If the throttle plate is visibly carboned up, cleaning may help - but check whether your vehicle needs a throttle relearn procedure afterwards, because cleaning without it can leave the idle worse than before.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Fuel and air metering - injector circuits
P0200P0201P0202P0203P0204P0205P0206P0207P0208P0209P0210P0211P0212P0213P0214P0215P0216P0217P0218P0219P0220P0221P0222P0223P0224P0225P0226P0227P0228P0229P0230P0231P0232P0233P0234P0235P0236P0237P0238P0239P0240P0241P0242P0243P0244P0245P0246P0247P0248P0249P0250P0251P0252P0253P0254P0255P0256P0257P0258P0259P0260P0261P0262P0263P0264P0265P0266P0267P0268P0269P0270P0271P0272P0273P0274P0275P0276P0277P0278P0279P0280P0281P0282P0283P0284P0285P0286P0287P0288P0289P0290P0291P0292P0293P0294P0295P0296P0297P0298P0299