SPN 520286 FMI 31 is the Detroit fault code for Software Reset Due to Internal Monitoring, and this 1-page PDF gives the official description and the recommended action. The Motor Control Module (MCM2.1) records this code from its internal monitoring, and the listed remedy is to reprogram the MCM2.1 with the latest software release.
Official document details
| Brand | Detroit |
| Model coverage | DD Series (EPA 2007-current); also Series 60 (DDEC VI) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Fault code | SPN 520286, FMI 31 |
| Year / Revision | Copyright 2017 (TruckFaultCodes.com) |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN and FMI)
- Description of the MCM2.1 reset
- Recommended service action
- Clearing codes after service
Applicable models for SPN 520286 FMI 31
This diagnostic trouble code applies to Detroit DD13, DD15 and DD16 engines built to EPA 2007 and later standards, and to the Series 60 (DDEC VI) fault-code set. It is a Motor Control Module (MCM2.1) internal event rather than a wiring or sensor fault, so the fix is a software or module action. For current software releases and dealer support, see the official Detroit Diesel website.
Who needs this SPN 520286 FMI 31 guide
Technicians who see this code after an intermittent reset or during scan-tool diagnosis use this guide to confirm whether the MCM2.1 needs reprogramming or replacement, then clear the codes to verify the repair. This library page summarises the official Detroit fault-code sheet published on TruckFaultCodes.com (Copyright 2017) and is meant as a quick reference. Because the correct fix depends on module software levels and configuration, confirm the latest software release and programming steps against current Detroit Power Service Literature and the diesel diagnostic tool before replacing any hardware. After reprogramming, clear all fault codes and re-test; if the code stays active, contact the Detroit Customer Support Center at 800-445-1980 with your diagnostic log files. The complete PDF is available in the DiagTechPro manuals library, where a free account is required to download.
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