Code Definition

P0903 — Clutch Actuator Circuit High

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0903

P0903 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0903 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0903 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0903 fault code is set when the transmission control module (TCM) or engine control module (ECM) detects a high voltage condition in the clutch actuator circuit. This code indicates that the voltage within the circuit controlling the clutch actuator is exceeding the expected range, pointing to an electrical issue. The clutch actuator is a critical component in vehicles equipped with automated manual transmissions or certain automatic transmissions, as it controls the mechanical engagement and disengagement of the clutch. A high voltage condition in this circuit can result in improper oper...

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