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Derate Pending Soon — Possible Fault Codes
Found 5 fault codes associated with derate pending soon. Codes are sorted by severity — check STOP ENGINE codes first.
SPN 3031 FMI 9
DEF Quality Sensor
Volvo D13 • Component: DEF Concentration Sensor • J1939
SPN 4364 FMI 18
SCR NOx Conversion Low
International A26 • Component: SCR Catalyst System / DEF Dosing • J1939
SPN 4348 FMI 14
DEF Quality Out of Range
International A26 • Component: DEF Quality Sensor / DEF System • J1939
SPN 4364 FMI 18
SCR NOx Conversion Low
Detroit Diesel DD13 • Component: SCR Catalyst System / DEF Dosing • J1939
SPN 4348 FMI 14
DEF Quality Out of Range
PACCAR MX-13 • Component: DEF Quality Sensor / DEF System • 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 derate pending soon based on SAE J1939/J1587 fault code definitions and OEM service documentation.