Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 3845 PID: SPN: 5603 FMI: 31 Cruise Control Disable Command- Condition Exists

Circuit Description
The adaptive cruise control system sends commands to the ECM via the J1939 data link to limit engine speed and maintain a set following distance behind a vehicle travelling more slowly than the current cruise control set speed.

Component Location
The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the adaptive cruise control system was disabled for more than 30 seconds.

Action Taken When the Fault Code is Active
The ECM logs the fault code immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code
The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.

Shop Talk
This is an information fault code indicating that the adaptive cruise control system was disabled. The cruise control must be manually engaged when this condition exists.

Possible Cause:
1) ECM calibration