SPN 3696 FMI 13 is a Detroit DD Series diagnostic trouble code (DTC) that reports that the DPF regeneration force multiplex (MUX) switch message contains a signal-not-valid (SNV) indicator. 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): 3696 identifies the affected system and 13 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 | 0.13 MB |
| Format | |
| Language | English |
SPN 3696 FMI 13 description and steps
The SPN 3696 FMI 13 sheet describes the fault as “DPF Regen Force MUX Switch Message Contains SNV Indicator” and lays out the diagnostic path Detroit expects a technician to follow. Key points from the document:
- Verify CPC Group PGR001 parameter CM1 Source Addr SAE J1939 is set to 49.
- If it is set correctly, connect Service Link and verify the chassis modules are programmed correctly.
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 3696 FMI 13 manual
Fleet technicians, mobile diesel mechanics and workshop owners use this sheet to diagnose a DPF regen force MUX switch message that contains a signal-not-valid indicator 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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