SPN 2646 FMI 3 is the Detroit DD-Series diagnostic fault code document for the vehicle power shutdown event, published on TruckFaultCodes.com (copyright 2017) and archived as a 1-page PDF in the DiagTechPro library. The document explains a short to power on the pin 02 circuit of the CPC4 #4 connector, and notes that Common Powertrain Controller digital outputs can share a fault number with Motor Control Module (MCM2.1) faults.
SPN 2646 FMI 3 document details
| Brand | Detroit |
| Model coverage | Detroit DD-Series (DD13, DD15 and DD16), EPA 2007 and later |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Fault code (SPN) | 2646 |
| Failure mode (FMI) | 3 |
| Emissions calibration | GHG14 |
| Source | TruckFaultCodes.com (copyright 2017) |
| Pages | 1 |
| File size | 0.20 MB |
| Format | |
| Language | English |
The page records the official identifiers so a technician can confirm the exact code and calibration against the diesel diagnostic tool before starting any repair.
Document table of contents
- Fault code identification (SPN 2646 / FMI 3)
- Vehicle power shutdown description
- Affected circuit (CPC4 #4 connector, pin 02)
- Note: CPC4 versus MCM2.1 fault overlap
- OEM wiring schematic reference
This single-page description states that the shutdown indicates a short to power on the pin 02 circuit of the CPC4 #4 connector, and directs the technician to Original Equipment Manufacturer literature for the wiring schematic. An important note explains that the CPC4 digital outputs carry the same fault number as some MCM2.1 faults, and that the diesel diagnostic tool makes the distinction between the two controllers when the fault is read, so the correct module is diagnosed before any repair is attempted.
Applicable truck models
This document applies to Detroit DD-Series diesel engines in the EPA 2007-and-later range, typically the DD13, DD15 and DD16 as covered by the GHG14 calibration shown on the file. Confirm the engine calibration and connector layout for your chassis on the official Detroit engine site before ordering parts.
Who needs this SPN 2646 FMI 3 manual
Auto-electricians and heavy-truck diagnostic technicians tracing an unexpected power-down on a Detroit DD-Series chassis will use this page to confirm the affected connector pin and the controller involved.
The complete 1-page PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
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