White Crystals — Possible Fault Codes
Found 1 fault code associated with white crystals. Codes are sorted by severity — check STOP ENGINE codes first.
SPN 4334 FMI 7
DEF Dosing Valve Mechanical Fault
Cummins X15 • Component: DEF Dosing Valve (DMU) • 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 white crystals based on SAE J1939/J1587 fault code definitions and OEM service documentation.