Error code

OBD2 P0903

OBD2P0903
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Clutch Actuator Circuit High.

Severity

moderateCan drive, but may experience transmission issues and safety concerns.

Summary

P0903 indicates a high voltage issue in the clutch actuator circuit, which is part of the transmission control system.

Symptoms

  • Engine may stall during driving
  • Vehicle may not crank as a safety precaution
  • Transmission may enter 'limp' mode or get stuck in one gear

Common Causes

  • Short circuits due to damaged wiring or corrosion of electrical connectors
  • Internal failures in actuator motors/solenoids
  • Failures of clutch motion/travel sensors
  • Faulty selector switch on the gear selector

Diagnosis

  1. Check for related codes P0900, P0901, and P0902
  2. Inspect wiring, fuses, relays, and connectors for damage or corrosion
  3. Test the selector switch and battery condition
  4. Perform ground, power supply, and continuity checks on all wiring
  5. Check amperage draw of actuator motor/solenoid and position sensor

Fixes

  • Repair damaged wiring and connectors; replace faulty switches or sensors as needed.

FAQ

What should I do if the code returns after repairs?

There may be an intermittent fault present. Allow it to worsen before making a definitive repair.

Is replacing the TCM necessary for this issue?

TCM failures are rare and should only be considered if other causes have been ruled out.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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