The SPN 3250 FMI 7 fault code file is a Detroit GHG14 diagnostic sheet covering a Diesel Oxidation Catalyst (DOC) outlet temperature very high condition on DD Series engines. Compiled by TruckFaultCodes.com (© 2017) from Detroit Power Service Literature, this 6-page PDF gives technicians the exact troubleshooting order for DTC 3250-7. It is a field reference, not a substitute for the full factory manuals.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD13, DD15, DD16 |
| System / group | DD Series (EPA 2007-Current) — DTCs |
| Diagnostic code | DTC 3250-7, emission level GHG14 |
| Fault name | DOC Outlet Temperature Very High |
| Pages | 6 |
| File size | 0.4 MB |
| Format | |
| Source | TruckFaultCodes.com, from Detroit Power Service Literature |
| Language | English |
SPN 3250 FMI 7 fault summary
It opens with the monitor description (MIL and CEL lamps, a five-second duration) and warns against an early regen, then runs Automatic Cylinder Cutout and Idle Speed Balance tests before ATD teardown. Every step is laid out as a Yes/No decision branch, so you can follow the same path a Detroit dealer technician would without guessing.
- Monitor description and dash lamps (MIL, CEL)
- Monitoring DOC outlet temperature against 700C / 1292F
- Automatic Cylinder Cutout Service Routine
- Idle Speed Balance Test on DDDL/DDRS 7.08 SP2 or newer
- ATD removal and contamination inspection
- Parked regeneration verification
Applicable truck models and engines
This procedure applies to Detroit DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) family. The GHG14 procedure is built around the Aftertreatment Control Module (ACM2.1). For engine specifications and dealer support, see the official Detroit engine support site.
Who needs this SPN 3250 FMI 7 manual
Fleet technicians, mobile diesel mechanics and DD Series owners diagnosing this code with a diesel diagnostic tool such as DDDL or DDRS will find the exact step order, pin numbers and pass/fail limits they need. Keep it beside the truck during the repair.
The complete 6-page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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