This ISB6.7 fault code DTCs document is a troubleshooting PDF for Fault Code 1969 in the aftertreatment exhaust gas temperature system. It explains the circuit description, fault conditions, engine protection action, diagnostic checks, and repair direction for high aftertreatment temperature during active regeneration. The file is useful when the red STOP ENGINE lamp is active and the ECM has logged SPN 3249 FMI 0/0.
Official ISB6.7 fault code DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL CM2150 engines; file group lists ISB6.7 CM2150 (2007-09) |
| System/Group | Aftertreatment exhaust gas temperature sensors / DTCs |
| Publication no. | Not shown in 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
- 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 procedure applies to Cummins ISB, ISC, and ISL CM2150 engines using aftertreatment exhaust gas temperature sensors, with the library grouping identifying ISB6.7 CM2150 (2007-09). The fault concerns the aftertreatment diesel particulate filter inlet temperature sensor, aftertreatment diesel oxidation catalyst temperature differential, active regeneration, and the exhaust aftertreatment system location supplied by the OEM service manual. For manufacturer information, visit Cummins official website.
Who needs this ISB6.7 fault code DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this file when Fault Code 1969 reports “Aftertreatment Exhaust Gas Temperature 2 – Data Valid but Above Normal Operational Range – Most Severe Level.” It supports checks with INSITE™ electronic service tool, including active fault review, temperature sensor comparison, Cylinder Cutout Test, turbocharger exhaust outlet inspection, ECM calibration review, and clearing inactive codes.
The document states that the ECM can illuminate the red STOP ENGINE lamp, disable active and stationary regeneration, disable EGR valve operation, and command engine shutdown after 30 seconds in non-emergency calibrations. It also lists possible causes such as excessive engine oil or diesel fuel entering the exhaust, a damaged fuel injector, in-range temperature sensor failure, or another in-range engine sensor malfunction causing excessive fuel into the exhaust system. After repair, the aftertreatment system must be inspected for possible progressive damage before reuse.
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