P0902 Clutch Actuator Circuit Low

P0902 indicates the clutch actuator circuit is low. The controller sees low voltage, low current, or a grounded actuator control path.

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 the actuator before checking for a grounded control wire or missing supply voltage.

Symptoms of P0902

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 P0902

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

Measure actuator control voltage, feed supply, ground integrity, resistance, and current draw while checking for short-to-ground faults.
Inspect actuator connector terminals, harness routing, transmission case connector, relay or fuse supply, and module driver output.
Compare clutch actuator command with clutch position and shift inhibit data to confirm the low circuit is active during the fault.

Related OBD-II codes

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