SPN 904 FMI 13 is the Detroit DD Series diagnostic sheet that explains front axle speed signal missing on DD Series engines of all model years. This fault indicates the front axle speed signal is missing on the J1939 datalink. The sheet has the technician first check for Common Powertrain Controller (CPC) battery-voltage codes (SPN 168) and a Motor Control Module (MCM) SPN 625 CAN code, repairing those first. If only a J1939 error is present, it then confirms whether the CPC was recently reprogrammed and uses ServiceLink to check module communication status. This DiagTechPro library page outlines what the 1 page PDF contains before you download it.
SPN 904 FMI 13 document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007–Current) |
| System / group | J1939 front axle speed signal |
| Fault code (SPN / FMI) | 904 / 13 |
| Fault type | Front axle speed signal missing |
| Emissions platform | all model years |
| Source | TruckFaultCodes.com (Copyright © 2017) |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN and FMI reference)
- Fault description and datalink source
- Multiple-code check (battery voltage and CAN)
- Module configuration check with ServiceLink
- Communication troubleshooting procedure
Applicable truck models and engines
This fault sheet applies to Detroit DD Series engines built to the all model years emissions platform. It is used with the Detroit diesel diagnostic tool, and with ServiceLink where module configuration must be confirmed. Detroit publishes these fault codes through TruckFaultCodes.com, and the same SPN can appear on more than one module, so confirm the reading before ordering parts. For engine coverage and official service literature, see the Detroit official support site.
Who needs the SPN 904 FMI 13 sheet
Fleet technicians and Detroit-certified workshops troubleshooting this J1939 front axle speed signal fault need this sheet to follow the correct checks instead of guessing at parts. The procedure ends in the module communication troubleshooting for the affected module, so it suits technicians chasing a datalink dropout rather than a wheel-speed component.
The complete 1 page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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