Clutch Switch Input Circuit Malfunction
The P0704 code means the vehicle's onboard diagnostic system has detected: Clutch Switch Input Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $20 - $120 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
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Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light illuminated
- Cruise control does not engage
- Engine may not crank with clutch pedal pressed
- No drivability issues while driving
Probable Causes (Ranked by Likelihood)
- Faulty clutch pedal position switch Very High
- Misadjusted clutch switch High
- Damaged clutch switch wiring Moderate
- ECM clutch switch input circuit fault Low
Step-by-Step Diagnostic Procedure
-
Press and release the clutch pedal while checking if the switch clicks
-
Check for voltage change at the switch connector when the pedal is pressed and released
-
Inspect the switch mounting and adjustment at the clutch pedal
-
Check wiring from the switch to the ECM for damage
-
Replace or adjust the clutch switch as needed
Frequently Asked Questions
Can I drive with code P0704?
Yes. The clutch switch is used for cruise control engagement and starting safety. If the engine starts and shifts normally, driving is safe.
What does the clutch switch do?
The clutch switch tells the ECM whether the clutch pedal is pressed. It is used for the starter interlock and cruise control disengagement.
Is the clutch switch the same as the brake switch?
No, but they serve similar functions. The clutch switch is on the clutch pedal of manual transmission vehicles.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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