Detroit fault code 3216 FMI 3 GHG14 is the TruckFaultCodes.com diagnostic sheet for the SCR Inlet NOx Sensor Circuit Failed High condition on Detroit DD-series engines. This 1 page reference lists the fault identification, monitored conditions where shown, and the step-by-step troubleshooting the technician follows in the shop.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Publication no. | Not printed; TruckFaultCodes.com reference |
| Year / Revision | 2017 |
| Pages | 1 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN 3216 / FMI 3)
- Description and monitored parameters
- Enabling conditions and dash lamps
- Troubleshooting steps
- Sensor replacement reference
3216 FMI 3 GHG14 troubleshooting steps
The sheet monitors SCR Inlet NOx Sensor. Typical duration is 2 seconds, the dash lamps are MIL and CEL, and the engine reaction is none.
The single-page procedure begins by checking the DTC occurrence counter. If the counter reads five or less, the technician clears the fault and releases the vehicle; if it is higher, the SCR inlet NOx sensor is replaced following the GHG14 outlet NOx sensor removal procedure in Power Service Literature. Verification is a one-minute engine idle.
Applicable truck models
This sheet applies to Detroit DD-series diesel engines (the DD13, DD15 and DD16 family) built under the EPA 2007-Current emissions platform, in its GHG14 calibration. Engine and emissions specifications should always be confirmed against the vehicle build; full engine information is published on the Detroit Diesel official site.
Who needs this 3216 FMI 3 GHG14 manual
Detroit technicians and workshops diagnosing an aftertreatment inlet NOx sensor circuit fault on DD-series engines will use this sheet to decide between clearing the code and replacing the sensor. It is a quick bench reference rather than a full workshop manual, so the named removal steps still route back to Power Service Literature and, where escalation is needed, to the Detroit Customer Support Center.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
Related manuals library
