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Cummins ISX CM870 (2003-06) Fault Code: 2367 (V2) PID: S28 SPN: 1072 FMI: 3/3 Engine Brake Actuator Driver Output 2 Circuit – Voltage Above Normal or Shorted to High Source. Open circuit or high voltage detected at the engine brake solenoid number 2 signal circuit.

The engine brake fault code will only become active once the engine brakes are activated and will remain active until the ECM is powered down. Once the ECM is powered down, the fault code will be inactive until the engine brakes are activated again, if the circuit interruption is still present. This tree is designed to troubleshoot an inactive fault code.

Possible causes:

1)An open circuit in the engine harness, brake harness, or engine brake solenoids
2)A short to voltage source in the engine harness
3)A malfunctioning ECM.

Possible repairs:

1)Replace the engine brake solenoid.
2)Replace the ECM.
3)Repair or replace the engine harness.

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