SPN 524286 FMI 4 identifies the Detroit DD Series fault “Automatic Gear Selection: gear shift not plausible” for engines on all model years. This fault-code sheet documents SPN 524286 / FMI 4 together with the diagnostic steps a technician follows with a diesel diagnostic tool.
Official document details
| Brand | Detroit (Detroit Diesel) |
| Model coverage | DD Series diesel engines (EPA 2007-Current) |
| System / Group | DTCs — fault code reference |
| Publication no. | TruckFaultCodes.com reference, 2017 |
| Year / Revision | all model years |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification
- Fault description
- Check recent TCM/ACM/MCM/CPC programming
- Verify CPC software level R31 or higher
- Check transmission and ABS faults
- Verify transmission learned values
- Module and OEM references
Applicable truck models covered
This fault-code sheet applies to Detroit DD Series diesel engines on all model years. It describes the automatic gear selection: gear shift not plausible condition reported under SPN 524286 / FMI 4. Detroit documentation notes that some CPC4 digital outputs share an SPN with Motor Control Module (MCM2.1) faults, so the diesel diagnostic tool makes the distinction. For official service resources, see Detroit’s official website.
Understanding SPN 524286 FMI 4
This sheet identifies the fault as “Automatic Gear Selection: gear shift not plausible”. Using a diesel diagnostic tool, the procedure first checks for related Common Powertrain Controller (CPC) battery-voltage codes and other active faults, then works through the documented steps. Across two pages it checks recent TCM, ACM, MCM or CPC programming, verifies CPC software is R31 or higher, rules out other transmission and chassis ABS faults, confirms transmission learned values, and if needed runs the Transmission Learn Procedure or contacts the Detroit Customer Support Center.
Who needs the SPN 524286 FMI 4 sheet
Detroit diesel technicians, DD Series fleet workshops and mobile repair units use this fault-code sheet to read the condition correctly, follow the right diagnostic path with a diesel diagnostic tool, and reference Original Equipment Manufacturer literature for the matching wiring schematics before making a repair.
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