This Detroit SPN 3480 EPA10 troubleshooting sheet covers fault code SPN 3480/FMI 0, Fuel Compensation Pressure High, on Detroit DD Series engines. It walks through a short doser-purge test and a priming-port pressure measurement with gauge J-48876. Use it to confirm the fault with a diesel diagnostic tool before replacing the sensor or regulator.
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 | EPA10 |
| Publication no. | Detroit Power Service Literature (via TruckFaultCodes.com, © 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Detroit SPN 3480 EPA10 table of contents
- Fault code identification: SPN 3480, FMI 0
- Step 1: checking for other fuel system faults and codes
- Step 2: Doser Purge service routine and the 144 psi threshold
- Step 3: priming port pressure test with gauge J-48876
- Decision: replace FCP sensor or doser fuel pressure regulator
- Customer Support Center escalation criteria
Applicable truck models
This EPA10-tier procedure applies to Detroit DD Series diesel engines and centres on the fuel compensation pressure sensor and the doser fuel pressure regulator. The priming-port measurement is taken at 1800 RPM using the specified test gauge. See Detroit’s official service literature portal for the authoritative Detroit repair procedures.
Who needs this Detroit SPN 3480 EPA10 manual
Diesel technicians who see SPN 3480/FMI 0 on an EPA10 engine will use this sheet to separate a failed sensor from a failed regulator using measured pressures. It helps workshop owners avoid guessing on emissions-related fuel parts.
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.
Related manuals library
