P0903 Clutch Actuator Circuit High

P0903 points to a high clutch actuator circuit. The actuator control path is open, shorted to voltage, or reporting higher than expected electrical state.

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 assume the clutch is mechanically stuck until the high actuator circuit has been isolated.

Useful checks before replacing parts

Check actuator circuit voltage, ground, connector continuity, open-circuit faults, short-to-voltage faults, and driver command state.
Inspect actuator wiring through flex points, connector corrosion, module pins, and any recent clutch or transmission service work.
Compare actual clutch position response with actuator command to separate wiring faults from actuator or control module problems.

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.