SPN 5397 FMI 31 is the Detroit DD Series fault code for a Regen Frequency Error, and this single-page sheet explains the note and clearing procedure. Published on TruckFaultCodes.com (Copyright 2017), it stresses that regeneration must be completed with the diesel diagnostic tool because a dash-switch initiated regen will not clear this fault.
Official document details
| Brand | Detroit |
| Model coverage | DD13, DD15, DD16 (DD Series, EPA 2007-Current) and Series 60 DDEC VI |
| System/Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN undefined FMI undefined |
| Source | TruckFaultCodes.com, Copyright 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identity (SPN and FMI)
- Important note on clearing the code
- Troubleshooting steps 1 to 2
Applicable truck models
This quick reference applies to Detroit DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) range and the same code is cross-referenced on the Series 60 DDEC VI platform. Because the fault relates to how often the aftertreatment system requests a regeneration, it is handled at the diagnostic-tool level rather than through any single sensor replacement. For OEM-level service literature and engine coverage, see the official Detroit Diesel website.
SPN 5397 FMI 31 clearing procedure
The two documented steps are deliberately short. Step 1 connects the diesel diagnostic tool, and Step 2 performs a Parked Regeneration, clears faults and releases the vehicle. The document references Performing a Parked Regeneration Using the diesel diagnostic tool in Power Service Literature, and its highlighted note warns that a dash-switch initiated regen will not clear this fault. That single instruction is the key takeaway: the code stays stored until a proper tool-initiated parked regeneration is completed, which is exactly why the sheet exists as a standalone reference.
Who needs this SPN 5397 FMI 31 manual
Technicians who cannot clear a stubborn regeneration code use this 5397 FMI 31 manual to confirm that only a tool-initiated parked regeneration will reset it, saving a wasted trip through the dash switch. It is equally useful for workshop owners scoping how long a DD Series aftertreatment service will tie up a diagnostic bay, since the whole procedure is short but must be done with the correct tool.
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