This Detroit SPN 3480 troubleshooting sheet documents fault code SPN 3480/FMI 0, Fuel Compensation Pressure High, across all model years of the Detroit DD Series. It monitors hydrocarbon (HC) doser fuel line pressure and steps a technician through leak inspection, a doser purge and a parked regeneration. Confirmation is done with 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 3480 / FMI 0 |
| Emission tier | All years |
| Publication no. | Detroit Power Service Literature (via TruckFaultCodes.com, © 2017) |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Detroit SPN 3480 troubleshooting table of contents
- Fault code identification: SPN 3480, FMI 0
- Description: monitored parameter, MIL/CEL lamps and 10% derate
- Steps 1-3: safety, fuel-fault check and HC doser leak inspection
- Steps 4-7: tool connection, engine start and Purge Hydrocarbon Doser routine
- Fuel compensation pressure ranges (69-448 kPa) and FCP sensor decision
- Step 8: parked regeneration verification and code clearing
Applicable truck models
This all-years procedure applies to Detroit DD Series diesel engines including the DD15AT, and references the hydrocarbon doser block, the fuel compensation pressure sensor and Power Service Literature removal steps. One drop of fuel at a doser line can trigger the fault. See Detroit’s official service literature portal for the authoritative Detroit repair procedures.
Who needs this Detroit SPN 3480 troubleshooting manual
Technicians and fleet workshops diagnosing high fuel compensation pressure on any DD Series year will use this sheet to inspect for leaks, purge the doser and verify the repair with a parked regeneration. It suits shops standardising on one diagnostic flow.
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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