P0809 Clutch Position Sensor Circuit Intermittent

P0809 indicates an intermittent clutch position sensor circuit fault. The clutch-position signal drops out or becomes invalid only at certain times.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System: Transmission
Scope: iso-sae-controlled-p0
Standard: SAE J2012 / ISO 15031-6
Source: legacy-import

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 the clutch sensor without first reproducing the intermittent signal loss.

Useful checks before replacing parts

Graph clutch position data while slowly pressing and releasing the pedal, then repeat with vibration and heat if needed.
Inspect clutch pedal sensor adjustment, connector fit, terminal tension, wiring movement at the pedal, and shared reference or ground circuits.
Check for start, cruise cancel, rev-match, shift inhibit, or manual transmission control symptoms during the dropout.

Related OBD-II codes

These nearby transmission entries can help compare wording and fault area. They may share the same verification status as the source database.