P0704 Clutch Switch Input Circuit Malfunction

P0704 points to a clutch switch input circuit malfunction. The controller is not seeing the expected clutch pedal input signal.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace clutch hardware from this code; start with the switch input circuit and adjustment.

Symptoms of P0704

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0704

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Compare clutch switch data with actual pedal movement and any start-interlock or cruise-cancel behavior.
Inspect switch adjustment, connector fit, wiring, fuse feed, ground, and pedal bracket movement.
Review shift quality, cruise control, idle control, and starting symptoms that can share clutch switch input.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.