P0704
System
Powertrain (Transmission)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Clutch Switch Input Circuit Malfunction

Understand P0704, common causes, and the right SEAFLO pump to diagnose it.

Clutch pedal switch circuit fault on manual transmission vehicles — TCM/ECM uses clutch input for idle and start logic.

Common symptoms

  • No crank in neutral
  • Stalling when shifting
  • Check engine light

Typical causes

  • Failed clutch switch
  • Misadjusted switch at pedal
  • Wiring under dash
  • Clutch master cylinder interfering with switch

What scanner do you need?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Frequently asked questions

Can I diagnose P0704 with a basic code reader?
P0704 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P0704?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.