SPN 4077 FMI 0 is the Detroit diesel fault code documented in this high doser fuel line pressure troubleshooting guide for DD Series (EPA 2007-Current) engines. This 2-page PDF explains the monitored condition, the enabling parameters and the step-by-step checks a technician follows to confirm and repair the code. It is part of the Detroit DD Series diagnostic trouble code (DTC) library and follows the standard monitored-parameter, enabling-conditions and troubleshooting-step layout used across the Detroit fault-code set.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD Series (EPA 2007-Current); cross-referenced for Series 60 (DDEC VI – EPA 2007) |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | FMI 0 under SPN 4077 — High Doser Fuel Line Pressure |
| Emissions level | All years |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Language | English |
SPN 4077 FMI 0 troubleshooting steps
- The monitored parameter is hydrocarbon (HC) doser fuel line pressure, enabled during dosing, with a 10% derate and verification by parked regeneration.
- Shut off the engine, apply the parking brake, chock the wheels and complete the applicable safety steps.
- Replace the fuel doser injector valve and clean the flanged manifold/S-pipe cavity per Power Service Literature.
- Connect the diesel diagnostic tool, start the engine and run the Purge Hydrocarbon Doser service routine (up to three attempts, no more, to remove all air).
- Initiate a parked regeneration; if the code becomes active, retain the log file and contact the Detroit Customer Support Center (800-445-1980), otherwise clear faults and release the vehicle.
Applicable truck models and engines
This document applies to Detroit DD Series (EPA 2007-Current) engines and covers the high doser fuel line pressure condition during dosing. The procedure is published in Detroit Power Service Literature and drawn from the Detroit diesel fault-code set; always confirm the latest revision through the official Detroit engine support site.
Who needs this SPN 4077 FMI 0 manual
Fleet technicians and workshop owners use this guide to replace and purge the doser injector valve and validate the fix with a parked regeneration. Reading the full procedure before touching the harness keeps the diagnosis on the documented path and avoids replacing good parts.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download.
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