SPN 3246 FMI 20 is the Detroit DD Series (EPA 2007-current) diagnostic fault sheet for the DPF outlet temperature sensor stuck condition on the DPF outlet temperature sensor circuit. It covers the stuck-sensor diagnosis that compares DOC and DPF outlet temperatures, inspects both connectors for damage or water intrusion, and measures pigtail resistance before pointing to the EPA10 or GHG14 sensor removal procedure. The sheet is written for heavy-duty technicians who pull this diagnostic trouble code with a diesel diagnostic tool and need the confirmed factory step order rather than guesswork.
SPN 3246 FMI 20 document details
| Brand | Detroit (Detroit Diesel) |
| Model coverage | DD13, DD15 and DD16 — DD Series (EPA 2007-current) |
| System / Group | DPF outlet temperature sensor / DTCs |
| Fault code | SPN 3246 / FMI 20 |
| Emissions platform | EPA10/GHG14 |
| Source | TruckFaultCodes.com fault-code reference (© 2017) |
| Pages | 4 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 3246, FMI 20
- DPF outlet temperature sensor stuck
- Comparing DOC and DPF outlet temperatures
- Connector inspection for damage and water intrusion
- Pigtail resistance test and sensor removal
Applicable truck models
This DPF outlet temperature sensor stuck procedure applies to Detroit DD13, DD15 and DD16 engines built on the DD Series (EPA 2007-current) aftertreatment platform (EPA10/GHG14 calibrations) and is cross-listed for Series 60 DDEC VI (EPA 2007) installations that share the same DPF outlet temperature sensor. Removal and installation callouts refer to Detroit Power Service Literature, and the Detroit Customer Support Center (800-445-1980) is the authoritative escalation point. Full model and engine coverage is confirmed on the Detroit Diesel official website.
Who needs this SPN 3246 FMI 20 manual
Workshop owners, mobile diesel technicians and fleet maintenance teams reach for this manual the moment a scan tool reports SPN 3246/FMI 20. It keeps the diagnosis on the manufacturer’s confirmed path, which shortens repair time and avoids replacing a good DPF outlet temperature sensor. The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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