The 3250 FMI 31 GHG14 fault code file is a Detroit GHG14 diagnostic sheet covering an abnormal Diesel Oxidation Catalyst (DOC) temperature rise on DD Series engines. Compiled by TruckFaultCodes.com (© 2017) from Detroit Power Service Literature, this 2-page PDF gives technicians the exact troubleshooting order for DTC 3250-31. 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 3250-31, emission level GHG14 |
| Fault name | DOC Temperature Rise |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Source | TruckFaultCodes.com, from Detroit Power Service Literature |
| Language | English |
3250 FMI 31 GHG14 fault summary
It explains why the ACM2.1 flags an abnormal DOC temperature rise, usually an intermittent wiring fault on the DPF outlet temperature circuit, and how to confirm the cause. 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.
- Fault description and most likely cause
- Checking for additional active fault codes
- Monitoring DOC outlet temp on pin 27 in the SCR and DPF voltages routine
- Wiggle-testing the harness for voltage spikes
- DOC outlet temperature sensor resistance test (pins 1 and 2)
- Drag-testing terminals with the J-48476 and J-47410 kits
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 3250 FMI 31 GHG14 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 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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