This HC doser fuel pressure sheet documents Detroit SPN 3480 FMI 21 across all model years, a not-plausible reading that carries a 10 percent derate. It covers fuel-fault triage, leak inspection and component replacement in order. Follow the numbered steps.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | DD Series (EPA 2007-Current); also filed under Series 60 (DDEC VI – EPA 2007) |
| System / Group | DTCs — Fuel Cut-off Valve Pressure Not Plausible |
| Fault code | SPN 3480 / FMI 21 |
| Source | www.TruckFaultCodes.com (© 2017) |
| Pages | 4 |
| File size | 0.3 MB |
| Format | |
| Language | English |
HC doser fuel pressure diagnostic guide
After the vehicle is safed, any fuel system faults are repaired first, then the doser block assembly and injector valve fuel lines are inspected for external leaks, where a single drop can cause a failure. The compensation pressure sensor is replaced, or the doser block on a DD15AT, before the engine is started. A purge routine, taking up to three attempts, and a parked regeneration verify the repair; a code that returns during regeneration means retaining the log and calling the Detroit Customer Support Center.
Document table of contents
- Fault code identification: SPN 3480, FMI 21
- Description, monitored parameter and 10 percent derate
- Fuel-fault triage and external leak inspection
- Compensation pressure sensor replacement
- Doser purge, parked regeneration and verification
Applicable truck models
This procedure applies to Detroit DD Series engines built for EPA 2007 and later, covering all model years (EPA07, EPA10 and GHG14) as printed on the document cover, and the identical SPN/FMI sheet is also filed under Detroit Series 60 (DDEC VI, EPA 2007). Confirm the emissions platform on your truck and cross-check the connector and pin numbers against the official Detroit engine support site before making any repair.
Who needs this HC doser fuel pressure manual
A diesel technician on any Detroit DD model year use this sheet to triage fuel faults, catch tiny doser leaks and replace the compensation sensor in the right order before regenerating.
The full 4-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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