SPN 3696 FMI 4 is a Detroit DD Series diagnostic trouble code (DTC) that reports that the DPF regeneration switch has a short circuit to ground on the J1939 data network. This library entry summarizes the official one-page GHG14 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 4 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 | 0.22 MB |
| Format | |
| Language | English |
SPN 3696 FMI 4 description and steps
The SPN 3696 FMI 4 sheet describes the fault as “DPF Regeneration Switch Short Circuit to Ground” and lays out the diagnostic path Detroit expects a technician to follow. Key points from the document:
- Check for and repair Common Powertrain Controller (CPC4) SPN 168/FMI 0/14/18 (battery voltage) and Motor Control Module (MCM2.1) SPN 625/FMI 9 (CAN line) first.
- If the CPC4 was recently reprogrammed, verify CPC4 Group PGR001 parameter CM1 Source Addr SAE J1939 is set to 49.
- Otherwise connect ServiceLink to determine which modules are configured and their communication status, then follow the appropriate module communication procedure.
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 4 manual
Fleet technicians, mobile diesel mechanics and workshop owners use this sheet to diagnose a DPF regeneration switch short circuit to ground 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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