P0704
Clutch Switch Input Circuit Malfunction
- Severity
- Medium
- Driving
- Drivable — book it in
A fault in the clutch switch circuit on a manual or automated manual transmission. The module uses this switch to know when the clutch pedal is down - to allow starting, to cancel cruise control, and to manage fuelling during gear changes. The car will usually still drive, but starting and cruise control may not work as expected.
Possible causes
- CommonFailed or misadjusted clutch pedal switch
- CommonWiring or connector fault at the switch
- PossibleSwitch striker on the pedal broken or worn
- PossibleClutch pedal bushings worn, changing the pedal travel
- PossibleAftermarket alarm or immobiliser spliced into the circuit
What you might notice
- Engine will not start unless the pedal is pressed unusually far
- Engine starts without the clutch pressed when it should not
- Cruise control will not engage
- Check engine light on
What to check, in order
- Watch the clutch switch state on the live data screen while pressing the pedal fully.
- Check the switch adjustment. Most of these faults are adjustment or a worn striker, not a failed switch.
- Inspect the connector at the switch - it lives in the footwell and gets kicked.
- Check the pedal bushings. Worn bushings change how far the pedal has to travel to reach the switch.
- Ask whether an aftermarket alarm or immobiliser was fitted, since these are often wired into the clutch or brake switch.
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
Transmission
P0700P0701P0702P0703P0704P0705P0706P0707P0708P0709P0710P0711P0712P0713P0714P0715P0716P0717P0718P0719P0720P0721P0722P0723P0724P0725P0726P0727P0728P0729P0730P0731P0732P0733P0734P0735P0736P0737P0738P0739P0740P0741P0742P0743P0744P0745P0746P0747P0748P0749P0750P0751P0752P0753P0754P0755P0756P0757P0758P0759P0760P0761P0762P0763P0764P0765P0766P0767P0768P0769P0770P0771P0772P0773P0774P0775P0776P0777P0778P0779P0780P0781P0782P0783P0784P0785P0786P0787P0788P0789P0790P0791P0792P0793P0794P0795P0796P0797P0798P0799