This Detroit SPN 3480 GHG14 troubleshooting sheet documents fault code SPN 3480/FMI 0, Fuel Compensation Pressure High, on Detroit DD Series engines. It follows the monitored parameter — hydrocarbon (HC) doser fuel line pressure — through a 12-step diagnostic. The sheet is a factual reference for confirming the fault with a diesel diagnostic tool before any parts are replaced.
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 | GHG14 |
| Publication no. | Detroit Power Service Literature (via TruckFaultCodes.com, © 2017) |
| Pages | 4 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Detroit SPN 3480 GHG14 table of contents
- Fault code identification: SPN 3480, FMI 0
- Description: monitored parameter, dash lamps (MIL, CEL) and 10% derate
- Steps 1-5: safety, tool connection and multiple-code check
- Step 6: monitoring fuel compensation and doser fuel line pressure
- Steps 8-11: Purge Hydrocarbon Doser service routine and leak inspection
- Steps 11.1-12: Gen 1 / Gen 2 pressure ranges and parked regeneration verification
Applicable truck models
This procedure applies to Detroit DD Series diesel engines certified to GHG14 emissions standards, covering the hydrocarbon doser block assembly, the fuel compensation pressure (FCP) sensor, and pin 104 of the MCM. Removal steps reference Power Service Literature. See Detroit’s official service literature portal for the authoritative Detroit repair procedures.
Who needs this Detroit SPN 3480 GHG14 manual
Heavy-truck technicians and workshop owners diagnosing a high fuel compensation pressure reading during dosing will use this sheet to decide between an FCP sensor and a metering-unit repair. It suits anyone verifying the code through 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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