Cummins ISX CM870 (2003-06) Fault Code: 2366 (V1) PID: S28 SPN: 1072 FMI: 3/3 Engine Brake Actuator Circuit Number 1 – shorted high. Open circuit or high voltage detected at the engine brake solenoid number 1 signal circuit.

For engine have software older than 05040408

Possible causes:

1)Open circuit in the engine harness, brake harness, or engine brake solenoids
2)Signal circuit shorted to voltage source in the engine harness
3)Incorrect ECM calibration code in the ECM
4)Failed ECM
5)Loose connection at the engine brake solenoid.

Possible repairs:

1)Select the correct ECM code and transfer the code to the ECM.
2)Replace the engine brake harness.
3)Replace the engine brake solenoid.
4)Replace the ECM.
5)Repair or replace the engine harness.