Fault codeP0903

Clutch Actuator Circuit High

What this code means

Clutch Actuator Circuit High.

P0903 is a generic code: it means the same thing on every make. P0903 belongs to family P09xx — Transmission and controls. Its page explains how to read a code and groups all its codes by part.

Type of fault

The control unit reads a voltage on this circuit above its expected range. Usual causes: a broken wire or a poor ground, a short to a supply voltage, or the component itself. As with a low signal, check the wiring and connector before the part.

Automated gearbox actuators

Automated manual gearboxes are manual gearboxes whose clutch and gear changes are operated by actuators, hydraulic or electric. Sensors measure the clutch position and the selector position, and the control unit learns these positions.

What you notice

Jerky starts, a slipping clutch, a gear that will not engage, a gearbox stuck in neutral.

How to check it

Check the hydraulic fluid level if the system uses one, the actuators' connectors and the battery voltage, since these gearboxes are sensitive to it. After any repair or a battery disconnection, a relearn of the positions with a suitable tool is often required.

What to do

Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.

How to read this code

• PPowertrain
• 0standardised code
• 9Transmission and controls
• 03P0903

Other codes for the same part

• P0900Clutch Actuator Circuit / Open
• P0901Clutch Actuator Circuit Range/Performance
• P0902Clutch Actuator Circuit Low
• P0904Gate Select Position Circuit [senses left / right position]
• P0905Gate Select Position Circuit Range/Performance
• P0906Gate Select Position Circuit Low
• P0907Gate Select Position Circuit High
• P0908Gate Select Position Circuit Intermittent
• P0909Gate Select Control Error
• P0910Gate Select Actuator Circuit / Open [left / right motion]
• P0911Gate Select Actuator Circuit Range/Performance
• P0912Gate Select Actuator Circuit Low