The 3250 FMI 8 GHG14 fault code file is a Detroit GHG14 diagnostic sheet covering a Diesel Oxidation Catalyst (DOC) outlet temperature signal spike 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 3250-8. 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 3250-8, emission level GHG14 |
| Fault name | DOC Outlet Temperature Signal Spike |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Source | TruckFaultCodes.com, from Detroit Power Service Literature |
| Language | English |
3250 FMI 8 GHG14 fault summary
It treats the GHG14 signal spike as an intermittent wiring concern detected by the ACM2.1, screening for FMI 3 or 4 and wiggle-testing the DOC outlet temperature circuit for spikes. 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.
- Checking for SPN 3250 FMI 3 or 4 first
- Monitoring DOC outlet temp on pin 27
- Wiggle-testing the harness for voltage spikes
- DOC outlet temperature sensor resistance test
- Drag-testing terminals to the ACM2.1
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 8 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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