Derate Pending — Possible Fault Codes
Found 1 fault code associated with derate pending. Codes are sorted by severity — check STOP ENGINE codes first.
SPN 3031 FMI 9
DEF Quality Abnormal
Cummins X15 • Component: DEF Quality Sensor / DEF Tank • 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 based on SAE J1939/J1587 fault code definitions and OEM service documentation.