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)Open circuit in the engine harness, brake harness, or engine brake solenoids
2)Short to voltage source in the engine harness
3)Damaged ECM.
Possible repairs:
1)Replace the engine brake solenoid.
2)Replace the ECM.
3)Repair or replace the engine harness.
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