SPN 3720 FMI 16 is a Detroit DD Series diagnostic trouble code (DTC) that indicates the Diesel Particulate Filter (DPF) has reached the end of its service life and must be replaced, followed by an Ash Accumulator reset with the diesel diagnostic tool. 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.
On Detroit DD Series engines each fault is reported as a suspect parameter number (SPN) with a failure mode identifier (FMI): 3720 identifies the affected system and 16 describes how it failed. Read the pair with a diesel diagnostic tool such as DiagnosticLink to confirm whether the code is active or previously active before starting any repair.
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 | 0.19 MB |
| Format | |
| Language | English |
SPN 3720 FMI 16 description and steps
The SPN 3720 FMI 16 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 and perform the Ash Accumulator reset using the diesel diagnostic tool.
- Refer to “Resetting the EPA07/10/GHG14 Diesel Particulate Filter Ash Accumulators” in Power Service Literature.
- Refer to “Resetting the EPA10 Diesel Particulate Filter Ash Accumulators” 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 16 manual
Fleet technicians, mobile diesel mechanics and workshop owners use this sheet to diagnose a Diesel Particulate Filter that has reached the end of its service life 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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