P0704Clutch Switch Input Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- Only on cars with a clutch pedal: the clutch switch tells the engine module that the clutch is depressed, used to cancel cruise control, smooth load changes when shifting and for stop-start. The check is a plausibility test over driving events rather than a voltage check: Saab's Trionic T8 expects a change of state every time the car pulls away from 3 to 50 km/h (four misses in a row), the EDC16 diesel at gear changes (25 in a row, above 35 km/h and 1500 rpm), and Ford compares its two clutch switches continuously. None of them lights the check engine light; cruise control is disabled. Separate clutch pedal switch codes are P0830–P0835.
- What you may notice
- Cruise control not working or not cancelling when declutching
- Jerks or rev hang when shifting
- Stop-start inactive
- Usually no check engine light
- Likely causes
- LikelyClutch switch faulty or misadjusted (does not switch or too late)
- PossibleConnector or wiring at the pedal box damaged or corroded
- PossibleFloor mat or pedal stop shifted, switch bracket broken
- RareDriving style (pulling away or shifting without fully depressing the clutch)
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €120
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.