P0903 Fault Code

Clutch Actuator Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0903 fault code indicates an issue with the clutch actuator circuit, specifically that the circuit has a high voltage reading. This can lead to improper clutch operation and affect vehicle performance. The clutch actuator is responsible for controlling the engagement and disengagement of the clutch, which is essential for smooth shifting in manual and some automatic transmissions.

What are the symptoms of the P0903 code?

Symptoms associated with the P0903 code may include:

• Difficulty changing gears or a grinding noise when shifting.
• Unresponsive clutch pedal or erratic clutch behavior.
• Warning lights illuminated on the dashboard, such as the check engine light.
• Unusual stalling or hesitation while driving, especially when attempting to start moving from a stop.

What causes the P0903 code?

Common causes of the P0903 code include:

• A short circuit in the clutch actuator wiring or connectors.
• A malfunctioning clutch actuator motor.
• Faulty engine control module (ECM) affecting the clutch system.
• Poor electrical connection due to corrosion or damaged wiring.
• Failure of the hydraulic system that interacts with the actuator.

How to fix P0903?

To resolve the P0903 fault code, the following steps should be taken:

• Inspect the clutch actuator wiring and connectors for damage or corrosion. Repair or replace as necessary.
• Test the clutch actuator motor for proper operation and replace it if faulty.
• Check the engine control module for any related error codes and update or replace if needed.
• Ensure there are no leaks or issues within the hydraulic system.
• Clear the codes and perform a road test to verify that the issue is resolved.