P0900 Clutch Actuator Circuit/Open

P0900 indicates a clutch actuator circuit or open-circuit fault. The controller cannot complete the electrical path used to operate the clutch actuator.

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 clutch mechanical parts before verifying the actuator circuit and command path.

Useful checks before replacing parts

Check clutch actuator feed voltage, ground, driver command, circuit continuity, connector condition, and actuator resistance under load.
Inspect actuator wiring, transmission connector pins, hydraulic or electric actuator condition, and module power supply stability.
Compare clutch command, clutch position, gear selection, and shift inhibit data to confirm how the open circuit affects operation.

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.