SPN 3720 FMI 15 is a Detroit DD Series diagnostic trouble code (DTC) that indicates the Diesel Particulate Filter (DPF) has reached the end of its service life; the DPF lamp illuminates and the code logs once the truck reaches the appropriate mileage interval. This library entry summarizes the official one-page all model years fault-code sheet published on TruckFaultCodes.com (Copyright © 2017) so technicians can confirm the meaning of the code before opening the full PDF.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD13, DD15, DD16 and Series 60 (DDEC VI) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Publication | TruckFaultCodes.com fault-code sheet, © 2017 |
| Year / Revision | 2017 |
| Pages | 1 |
| File size | 0.13 MB |
| Format | |
| Language | English |
SPN 3720 FMI 15 description and steps
The SPN 3720 FMI 15 sheet describes the fault as “Diesel Particulate Filter (DPF) Has Reached the End of Its Service Life and Must Be Replaced” and lays out the diagnostic path Detroit expects a technician to follow. Key points from the document:
- Replace the DPF, then complete the DPF Ash Accumulator Routine from the Actions drop-down menu in the diesel diagnostic tool.
- Removing accumulated ash is a normal part of vehicle maintenance and is a customer charge; the recommended service is a reliabilt® Clean DPF, which carries a parts warranty and the same cleaning interval as the original.
- Alternate cleaning methods may keep the DPF from reaching the next ash interval and can damage the Diesel Oxidation Catalyst (DOC) or DPF assemblies.
- Refer to the EPA07/10/GHG14 and EPA10 Ash Accumulator reset procedures in Power Service Literature.
Applicable truck models
This fault-code sheet applies to Detroit DD Series engines (DD13, DD15 and DD16) built to EPA 2007 and later emissions standards, and to Series 60 engines with DDEC VI (EPA 2007). Coverage and calibration always depend on the specific chassis and engine build, so verify applicability against the vehicle before servicing. For engine specifications and warranty details, see the Detroit Diesel official website.
Who needs this SPN 3720 FMI 15 manual
Fleet technicians, mobile diesel mechanics and workshop owners use this sheet to diagnose a Diesel Particulate Filter at the end of its service life at the mileage interval quickly and to avoid replacing parts on guesswork. Keeping the exact Detroit procedure on hand shortens diagnostic time and supports a clean repair record.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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