Cummins ISC CM2150 (2007-09) Fault Code: 2183 PID: SID 79 SPN: 1072 FMI: 4 Engine Brake Actuator Circuit #1 – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the engine brake solenoid number 1 signal circuit.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

Possible causes:

1)A short circuit to ground in the engine harness, connector, or engine brake solenoids.

Possible repairs:

1)Replace the engine brake harness.
2)Replace the engine harness.
3)Replace the engine brake solenoid.
4)Replace the ECM.