This fault code 1968 DTCs document is a troubleshooting procedure for an aftertreatment exhaust gas temperature 2 fault on CM2150 engines. It explains the circuit, fault conditions, ECM action, likely causes, and guided diagnostic steps for technicians using INSITE™.
Official fault code 1968 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL CM2150 service procedures |
| System/Group | DTCs; aftertreatment exhaust gas temperature sensors; diesel particulate filter inlet temperature |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 9 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Fault Code 1968
- Conditions for Running the Diagnostics
- 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 – Check the fuel system.
- Guided Step 3 – Check the turbocharger outlet.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines in the 2007-09 coverage group. The text also references ISB, ISC, and ISL CM2150 engines when directing the user to service manual procedures for injector replacement, aftertreatment inspection, ECM calibration, and related repair actions. The fault concerns SPN 3249 FMI 0/16, where the aftertreatment diesel particulate filter inlet temperature sensor reading exceeds the maximum temperature limit during active regeneration. For current manufacturer information, visit Cummins official website.
Who needs this fault code 1968 DTCs manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing an amber CHECK ENGINE lamp, disabled regeneration, or high aftertreatment temperature fault on CM2150 applications. It is most useful when INSITE™ electronic service tool data is available for fault code checks, exhaust gas temperature sensor comparison, Cylinder Cutout Test work, and ECM calibration review.
The troubleshooting logic starts by checking for active related fault codes 1665, 1666, 1667, 1674, 1675, or 1676. It then compares the three aftertreatment exhaust gas temperature sensor values after the engine idles for more than 10 minutes, using a 42°C or 75°F variation as the decision point shown in the procedure. Later steps check for injector misfire, oil or fuel contamination at the turbocharger exhaust outlet, and possible diesel fuel or engine oil entering the aftertreatment system. The document also warns that the aftertreatment system must be inspected after repair because progressive damage may have occurred.
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