The Detroit fuel mass signal document is a Detroit fault code reference that explains a fuel mass signal that is not available over the CAN bus, published for DD Series engines under SPN 5503 FMI 13 (GHG14). It gives workshop technicians the diagnostic sequence used to confirm the condition and return the truck to service, sourced from Detroit Power Service Literature.
Official document details
| Brand | Detroit (Detroit Diesel) |
| Model coverage | DD Series (EPA 2007-Current) and Series 60 (DDEC VI) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Fault code | SPN 5503 / FMI 13 |
| Emissions family | GHG14 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 5503 / FMI 13
- Recent reprogramming check
- Ignition cycle and power-down procedure
- PT CAN troubleshooting reference
- Clearing codes and releasing the vehicle
Troubleshooting the Detroit fuel mass signal code
This is a single-page routine that first asks whether the ACM2.1, MCM2.1 or CPC4 has been recently reprogrammed; if so and the code does not return, the vehicle is released. Otherwise the technician turns the ignition off, waits five minutes for the modules to power down, cycles the ignition and reconnects the diesel diagnostic tool, following the full SPN 625/FMI 9 procedure for further PT CAN troubleshooting when the fault is still active.
Applicable truck models and engines
This diagnostic sheet applies to Detroit DD Series diesel engines built to EPA 2007 through current emissions standards, and the covered fault also appears on Series 60 (DDEC VI) applications listed in the source. Confirm the exact engine family and calibration against the vehicle before making repairs, and cross-check the specifications on the official Demand Detroit website.
Who needs this Detroit fuel mass signal manual
Heavy-duty truck technicians, fleet maintenance staff and workshop owners diagnosing SPN 5503 FMI 13 with a diesel diagnostic tool will use this sheet to follow the correct steps rather than replacing parts by guesswork.
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