SPN 3246 FMI 21 is the Detroit DD Series (EPA 2007-current) diagnostic fault sheet for the DPF outlet temperature sensor not plausible condition on the DPF outlet temperature sensor circuit. It documents the plausibility check that compares the Diesel Oxidation Catalyst (DOC) outlet temperature against the DPF outlet temperature and, when they disagree, walks through harness inspection and pigtail resistance testing of both sensors. 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 21 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 21 |
| Emissions platform | EPA10/GHG14 |
| Source | TruckFaultCodes.com fault-code reference (© 2017) |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 3246, FMI 21
- DPF outlet temperature sensor not plausible
- Comparing DOC and DPF outlet temperatures
- Harness inspection for bent, spread or corroded pins
- Pigtail resistance test and sensor replacement
Applicable truck models
This DPF outlet temperature sensor not plausible 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 21 manual
Workshop owners, mobile diesel technicians and fleet maintenance teams reach for this manual the moment a scan tool reports SPN 3246/FMI 21. 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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