Powertrain, generic · Transmission

P0704 Clutch Switch Input Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Clutch switch faulty or misadjusted (does not switch or too late)
Connector or wiring at the pedal box damaged or corroded
Floor mat or pedal stop shifted, switch bracket broken
Driving style (pulling away or shifting without fully depressing the clutch)

Symptoms

  • Cruise control not working or not cancelling when declutching
  • Jerks or rev hang when shifting
  • Stop-start inactive
  • Usually no check engine light

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–120
Time0.3–1 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

clutch switchswitch wiringengine control module

Related codes

P0830P0831P0832P0833P0703P0504

References: law.cornell.edu, fordservicecontent.com, saabwisonline.com, saabwisonline.com.