This Cummins 3255 fault code document is a 13-page troubleshooting manual for aftertreatment diesel particulate filter outlet temperature on CM2250 engines. It explains Fault Code 3255, SPN 3246 FMI 16, the red STOP ENGINE lamp response, diagnostic conditions, likely causes, and guided checks using INSITE™ electronic service tool.
Official Cummins 3255 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated coverage shown for 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 diesel particulate filter outlet temperature sensor circuit |
| Year/Revision | Last modified 11-Jun-2010 and 07-Dec-2010; file year unknown |
| Pages | 13 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Fault Code 3255: Aftertreatment Diesel Particulate Filter Outlet Temperature – Data Valid But Above Normal Operating Range – Moderately Severe Level
- 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
- Guided Step 1 – Check the aftertreatment system
- Guided Step 2 – Check the fuel system
- Guided Step 3 – Check the turbocharger outlet
- Guided Step 4 – Check the aftertreatment fuel injector (if equipped)
- Guided Step 5A – Check the aftertreatment diesel oxidation catalyst for soot accumulation
- Guided Step 6B – Disable the fault code
Applicable truck models
This file applies to Cummins CM2250 engine diagnostics where Fault Code 3255 is used for aftertreatment diesel particulate filter outlet temperature protection. The extract lists ISB6.7 CM2250 as the main model group and also shows associated procedures for ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. For the sensor location, the document directs users to the OEM service manual because the aftertreatment temperature sensor is located in the aftertreatment system. See the manufacturer’s site at Cummins official website.
Who needs this Cummins 3255 fault code manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins 3255 fault code manual when diagnosing high DPF outlet temperature readings, disabled active or stationary regeneration, and red STOP ENGINE lamp events. It is also useful when checking injector misfire, oil or fuel contamination at the turbocharger outlet, SCR catalyst condition, diesel oxidation catalyst face plugging, aftertreatment exhaust gas temperature sensors, ECM calibration, and INSITE™ fault clearing steps.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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