Cummins ISM CM870 (2003-06) Fault Code: 2363 PID: S29 SPN: 1073 FMI: 4/4 Engine Brake Actuator Driver Output 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the engine brake solenoid number 2 signal circuit.

Possible causes:

1)Short circuit to ground in the engine harness, connectors, or engine brake solenoids
2)Failed ECM.

Possible repairs:

1)Remove the internal actuator harness.
2)Replace the engine brake solenoid.
3)Replace the ECM.

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