Damaged or corroded wiring harness or connector at the clutch actuator; Failed clutch actuator solenoid or motor; Blown fuse or poor ground connection in the actuator circuit; Short to ground in the signal or power wire; Faulty transmission control module (TCM) or PCM driver circuit; Internal mechanical binding in the clutch actuator assembly causing excessive current draw

DTC codes / P09xx · Transmission / P0902

P0902Clutch Actuator Circuit Low

Q: What does code P0902 mean?

Clutch Actuator Circuit Low. P0902 indicates that the powertrain control module (PCM) has detected an abnormally low voltage or current on the clutch actuator circuit, which typically points to a short to ground or an open circuit in the wiring or actuator itself. The clutch actuator is responsible for engaging and disengaging the clutch in automated manual or dual-clutch transmissions, so a low circuit condition can prevent proper gear changes.

P0902 indicates that the powertrain control module (PCM) has detected an abnormally low voltage or current on the clutch actuator circuit, which typically points to a short to ground or an open circuit in the wiring or actuator itself. The clutch actuator is responsible for engaging and disengaging the clutch in automated manual or dual-clutch transmissions, so a low circuit condition can prevent proper gear changes.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Symptoms you may notice

Illumination of the check engine light or transmission warning light
Transmission may fail to engage or disengage the clutch, causing difficulty shifting or a stuck gear
Vehicle may enter limp mode or refuse to move from a stop
Rough or jerky engagement when attempting to accelerate
Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

Damaged or corroded wiring harness or connector at the clutch actuator
Failed clutch actuator solenoid or motor
Blown fuse or poor ground connection in the actuator circuit
Short to ground in the signal or power wire
Faulty transmission control module (TCM) or PCM driver circuit
Internal mechanical binding in the clutch actuator assembly causing excessive current draw

How to diagnose and fix it

Inspect the clutch actuator wiring and connectors for chafing, corrosion, or loose pins
Check the fuse and relay supplying power to the clutch actuator circuit
Measure resistance and voltage at the actuator connector to verify power and ground integrity
Perform a wiggle test on the harness while monitoring live data to catch intermittent faults
Test the clutch actuator with a bidirectional scan tool to command engagement and observe circuit response
If the actuator fails under command, replace the clutch actuator assembly
Clear the code and perform a relearn or adaptation procedure for the clutch system if required

Don't overlook the simple wiring faults

A low circuit code often results from a short to ground in the wiring rather than a failed actuator, so always inspect the harness before replacing parts.
On some vehicles, a weak battery or poor ground can cause spurious low-voltage codes in the clutch actuator circuit, so verify charging system health first.
The clutch actuator may share power or ground with other transmission solenoids, so a fault in a related circuit can trigger P0902 as a secondary code.
Intermittent P0902 codes that appear only in cold weather often point to a failing actuator motor with high internal resistance when cold.
A misadjusted clutch actuator or worn clutch pack can cause the actuator to draw excessive current, setting a low circuit code without any wiring fault.

Can I keep driving with P0902?

If the vehicle drives normally and the light is steady, you can drive cautiously to a repair shop, but avoid aggressive acceleration or heavy loads. If the transmission slips, refuses to shift, or the vehicle enters limp mode, stop driving and have it towed to prevent further damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.