SPN 2623 FMI 4 is the Detroit DD-Series diagnostic fault code document for the PWM accelerator pedal J1939 GAS2 signal is missing event, published on TruckFaultCodes.com (copyright 2017) and archived as a 1-page PDF in the DiagTechPro library. The document covers a missing J1939 GAS2 accelerator pedal signal, beginning with checks for related battery-voltage and CAN-line faults before the pedal or its configuration is suspected.
SPN 2623 FMI 4 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) | 2623 |
| Failure mode (FMI) | 4 |
| Emissions calibration | All model years |
| Source | TruckFaultCodes.com (copyright 2017) |
| Pages | 1 |
| File size | 0.23 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 2623 / FMI 4)
- GAS2 signal missing description
- Step 1 – Check for multiple codes (SPN 168, SPN 625/FMI 9)
- Controller Area Network (CAN) line repair
- Step 2 – CPC reprogramming check
- ServiceLink module configuration
The procedure first checks for multiple codes: Common Powertrain Controller battery-voltage faults on SPN 168, and Motor Control Module SPN 625/FMI 9, which indicates a Controller Area Network line problem to repair first. If only the J1939 error remains, the technician confirms whether the CPC has been recently reprogrammed and verifies its configuration. When the configuration is correct, ServiceLink is connected to determine which modules are configured for the vehicle and their communication status, guiding the correct module troubleshooting path.
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 All model years 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 2623 FMI 4 manual
Technicians tracing a lost GAS2 pedal signal on a Detroit DD-Series truck will use this page to rule out network and configuration faults before condemning the pedal.
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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