Detroit DD15 GHG14 (2014-16) Fault Code: SPN 4331 FMI 18 (ACM) DEF Dosing Quantity Low
NOTE: The fault indicates that the DEF pump speed is high compared to DEF quantity delivered. The CEL lamp will remain on until the fault is resolved.
NOTE: If code 3364-xx present, fix that first.
PROBABLE CAUSES:
1. Check all DEF supply lines for damage or leaks.
2. DEF tank is contaminated with gas, diesel, water, etc…
3. Doser valve failure.
4. DEF pump.
5. DEF pump connection/harness.
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