SPN 3847 FMI 4 is a Detroit fault code documented in this single-page DD Series (EPA 2007-Current) troubleshooting PDF, covering a short to ground on pin 15 on the digital input channel of the Common Powertrain Controller (CPC4) #1 connector. This factual reference reproduces the official TruckFaultCodes.com procedure for SPN 3847 FMI 4, including the diagnostic note and the numbered troubleshooting steps a technician follows before touching the harness. Read it to confirm the code, verify the configured parameters, and locate the exact pin circuit at fault.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD Series (EPA 2007-Current) and Series 60 (DDEC VI – EPA 2007) |
| System / Group | DTCs — Common Powertrain Controller (CPC4) |
| Fault code | SPN 3847, FMI 4 |
| Publication | TruckFaultCodes.com, Copyright 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 3847 FMI 4 document contents
- Fault code header identifying SPN 3847 and FMI 4
- Diagnostic note: CPC4 outputs can share an SPN with some Motor Control Module (MCM) faults, and the diesel diagnostic tool distinguishes the two
- Troubleshooting steps: ignition ON, connect the diesel diagnostic tool, open the parameters work window
- Parameter verification in PGR013 digital inputs, mapped to the correct component (example: Hood Tilt Switch)
- Repair guidance and reference to OEM wiring schematic literature
Applicable truck models
This code applies to heavy-duty Detroit engines that use the CPC4 across DD Series (EPA 2007-Current) and Series 60 (DDEC VI – EPA 2007) platforms, typically in Freightliner and Western Star trucks. The document reports a short to ground on pin 15 on the CPC4 #1 connector, and the parameter check in PGR013 digital inputs confirms the channel is mapped to the intended component such as the Hood Tilt Switch. For engine coverage and official service data, see the Detroit Diesel official site.
Who needs this SPN 3847 FMI 4 manual
Diesel technicians, fleet workshops, and mobile mechanics who read SPN 3847 / FMI 4 on a Detroit diagnostic tool use this page to follow the exact factory sequence instead of guessing. It keeps the CPC4 connector diagnosis repeatable and points to the OEM wiring schematic needed for the final repair on the #1 connector.
Related manuals library
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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