This fault code 3165 DTCs document is a troubleshooting manual for an SCR outlet temperature fault on CM2250 engines. It explains the circuit, fault logic, service effects, clearing conditions, and guided checks used with INSITE™ electronic service tool.
Official fault code 3165 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated procedure tables also list ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment SCR outlet temperature diagnostics. |
| Publication no. | 4022254 for ISB6.7 CM2250 entries in the associated procedures table. |
| Year/Revision | Year unknown; pages show Last Modified: 11-Jun-2010 and Last Modified: 21-Jan-2011. |
| Pages | 15 |
| 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
- STEP 1. Check the aftertreatment system.
- STEP 2. Check the diesel exhaust fluid (DEF) for contamination.
- STEP 3. Check the fuel system.
- STEP 4. Check the turbocharger outlet.
- Guided Step 5 – Check the aftertreatment fuel injector.
- Guided Step 6B – Inspect the aftertreatment diesel oxidation catalyst for cracks in the cell wall.
- Guided Step 7 – Check ECM calibration and clear fault codes.
Applicable truck models
The file is listed for Cummins ISB6.7 CM2250 DTC service information and includes associated procedure references for several CM2250 engine families. The procedure table names ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250, with procedures for injectors, SCR catalyst, diesel oxidation catalyst, exhaust system diagnostics, aftertreatment testing, ECM calibration code, and SCR catalyst temperature sensor interface module where listed. For manufacturer information, visit Cummins official website.
Who needs this fault code 3165 DTCs manual
This manual is useful for diesel technicians, fleet maintenance shops, and workshop owners diagnosing a red STOP ENGINE lamp, disabled diesel exhaust fluid injection, or high SCR outlet temperature readings. It supports checks for DEF contamination, injector misfire, turbocharger outlet oil or fuel, aftertreatment fuel injector leakage, catalyst damage, and ECM calibration status.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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