P0808 Clutch Position Sensor Circuit High

P0808 indicates a high clutch position sensor circuit input. The clutch position signal is higher than the controller expects.

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 adjust or replace clutch parts before checking the high-input circuit fault.

Symptoms of P0808

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 P0808

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

Check for short-to-voltage, open ground, poor connector contact, and a signal stuck high.
Compare clutch position data with pedal or actuator movement and confirm sensor adjustment.
Inspect harness routing near the pedal, clutch actuator, or transmission for chafing and water intrusion.

Related OBD-II codes

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