Scr Fault — Possible Fault Codes
Found 1 fault code associated with scr fault. Codes are sorted by severity — check STOP ENGINE codes first.
SPN 4342 FMI 4
NOx Sensor Outlet
Detroit Diesel DD13 • Component: NOx Sensor (Outlet) / Wiring • J1939
⚠️ 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 scr fault based on SAE J1939/J1587 fault code definitions and OEM service documentation.