Military Separation Program Numbers (SPN Codes) define the reason a discharge or separation was granted. SPN Codes were replaced by alpha-numeric separation codes but can still be found on many older DD-214s.
Separation Program Numbers (SPN Codes) | Military Benefits
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Using a code reader tool, connect to the ECM and find the “fault codes” tab. The displayed codes can generally be clicked on one by one. Another option is to select “erase all faults” and then follow the onscreen instructions. At the end of the procedure, the ignition key should be turned off.
How to Clear Cummins Fault Codes - Prosource Diesel
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