This Detroit DEF quality GHG14 troubleshooting sheet documents fault code SPN 3364/FMI 2 on GHG14 Detroit DD Series engines, where the monitored parameter is DEF quality after a refill event. It measures fluid concentration, tests the dosing unit quantity and verifies NOx conversion during a parked regeneration. Diagnosis uses a diesel diagnostic tool.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | DD Series diesel engines (DD13, DD15, DD16), EPA 2007 and newer |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 3364 / FMI 2 |
| Emission tier | GHG14 |
| Publication no. | Detroit Power Service Literature (via TruckFaultCodes.com, © 2017) |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Detroit DEF quality GHG14 table of contents
- Fault code identification: SPN 3364, FMI 2
- Description: DEF quality after a refill event, MIL/CEL lamps
- Step 1: check for other related faults
- Step 2: measure DEF percentage (28-36%) with kit W060589001900
- Steps 3-6: inspect DEF lines and run a DEF Quantity Test
- Steps 7-8: chart NOx sensors and run a parked regeneration
Applicable truck models
This GHG14-tier procedure applies to Detroit DD Series diesel engines with SCR aftertreatment, covering the GHG14 dosing system doser and NOx sensors. Verification requires the 85% NOx conversion threshold during regeneration. See Detroit’s official service literature portal for the authoritative Detroit repair procedures.
Who needs this Detroit DEF quality GHG14 manual
Technicians handling this DEF quality code on a GHG14 engine will use the sheet to test fluid concentration and dosing quantity before replacement. It suits workshops confirming repairs with a parked regeneration.
The full PDF is available in the DiagTechPro manuals library — a free account is required to download. It is offered for reference alongside your Detroit diesel diagnostic tool. DiagTechPro catalogues Detroit fault-code documents so technicians can locate the exact SPN and FMI they are chasing without paging through a full engine service manual. Each entry lists the page count, file size and emission tier up front, and links to the closely related codes shown below so a diagnosis can move quickly from one fault to the next.
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