This Cummins 3168 troubleshooting document explains Fault Code 3168 for the aftertreatment diesel particulate filter system. It covers the circuit description, fault conditions, INSITE™ checks, DPF differential pressure sensor tube inspection, DPF tampering or damage inspection, ECM calibration review, and fault clearing steps.
Official Cummins 3168 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | File listing: ISB6.7 CM2250 (2010-12). Extracted associated procedures also list ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. |
| System/Group | DTCs; aftertreatment diesel particulate filter system |
| Publication no. | Not shown. Associated bulletin numbers shown include 4022250, 2883445, 4022256, and 4022255. |
| Year/Revision | Unknown; last modified 11-Jun-2010 and 06-Dec-2010 in the extract |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 3168
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Inspect the aftertreatment diesel particulate filter differential pressure sensor and tubes.
- Guided Step 3 – Check the presence of the aftertreatment diesel particulate filter.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The file information identifies Cummins ISB6.7 CM2250 (2010-12) DTC coverage. The extracted associated procedure table also references ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 applications for aftertreatment diesel particulate filter, differential pressure sensor tube, ECM calibration, and sensor procedures. The document states that the aftertreatment diesel particulate filter is installed in the exhaust system by the OEM, so vehicle-specific location details must be checked in the OEM service manual. See the official Cummins website.
Who needs this Cummins 3168 troubleshooting manual
This manual is useful for technicians diagnosing amber CHECK ENGINE lamp or MIL events related to SPN 3936 FMI 16 after an active regeneration. It supports workshops checking Fault Codes 1879, 1881, or 1883, inspecting DPF differential pressure sensor tubes for leaks, cracks, loose fittings, missing tubes, plugged tubes, or reversed connections, and confirming whether the aftertreatment diesel particulate filter has been removed, tampered with, or damaged.
The procedure also directs mechanics to compare the ECM code and revision number in INSITE™ against ECM Calibration Revision History, calibrate the ECM if required, then operate the engine under the specified clearing conditions. Full PDF available in the DiagTechPro manuals library, free account required to download.
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