DPF temperature circuit low is the Detroit DD Series (EPA 2007-current) diagnostic fault sheet for the DPF outlet temperature circuit failed low condition on the DPF outlet temperature sensor circuit. It walks through the circuit-failed-low test on EPA07 hardware: disconnecting the DPF outlet temperature sensor and the Motor Control Module 120-pin connector, measuring resistance across the sensor pins, and locating a short between MCM wires 115 and 88. 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.
DPF temperature circuit low 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 4 |
| Emissions platform | EPA07 |
| Source | TruckFaultCodes.com fault-code reference (© 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 3246, FMI 4
- DPF outlet temperature circuit failed low
- Disconnecting the MCM 120-pin connector
- Resistance measurement across the sensor pins
- Locating a short between MCM wires 115 and 88
Applicable truck models
This DPF outlet temperature circuit failed low procedure applies to Detroit DD13, DD15 and DD16 engines built on the DD Series (EPA 2007-current) aftertreatment platform (EPA07 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 DPF temperature circuit low manual
Workshop owners, mobile diesel technicians and fleet maintenance teams reach for this manual the moment a scan tool reports SPN 3246/FMI 4. 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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