No Communication — Possible Fault Codes

Found 2 fault codes associated with no communication. Codes are sorted by severity — check STOP ENGINE codes first.

⚠️ 2 STOP ENGINE-level codes associated with this symptom. Do not continue driving.

SPN 625 FMI 9

ECM Communication Lost

Detroit Diesel DD15 • Component: Engine Control Module / CAN Bus • J1939

🔴 STOP ENGINE

SPN 639 FMI 9

J1939 CAN Bus Communication Loss

Cummins ISX15 • Component: Engine Control Module / CAN Bus • J1939

🔴 STOP ENGINE

⚠️ Diagnostic Note: Symptoms can have multiple root causes. Always verify with a diagnostic scan tool before replacing parts. The fault codes listed above are possible matches for no communication based on SAE J1939/J1587 fault code definitions and OEM service documentation.