This Cummins 3312 fault code document is a 14-page troubleshooting PDF for an aftertreatment diesel particulate filter outlet temperature fault. It explains Fault Code 3312, SPN 3246 FMI 0, the red STOP ENGINE lamp response, and guided diagnostic checks using INSITE™ electronic service tool.
Official Cummins 3312 fault code document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250 in associated procedures. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel particulate filter outlet temperature sensor circuit |
| Publication no. | Not specified in the extract |
| Year/Revision | Last Modified: 18-Jan-2011; overview section shows 11-Jun-2010 |
| Pages | 14 |
| 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 fuel system
- STEP 3. Check the turbocharger outlet
- Guided Step 5 – Inspect the aftertreatment diesel oxidation catalyst
- ECM Calibration Revision History
Applicable truck models
This file applies to Cummins CM2250 engine platforms shown in the extract, with primary library coverage listed as ISB6.7 CM2250 (2010-12). The associated procedures also name ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250, so workshops using these engines can match the same fault-code workflow to the correct service bulletin and procedure number. See the official manufacturer site at Cummins.
Who needs this Cummins 3312 fault code manual
Diesel mechanics, fleet technicians, and workshop owners need this Cummins 3312 fault code manual when a truck logs an above-normal DPF outlet temperature fault and regeneration is disabled. It is also useful when checking possible injector misfire, oil or fuel contamination at the turbocharger exhaust outlet, soot accumulation in the diesel oxidation catalyst, or ECM calibration status.
The diagnostic summary states that the ECM sets the fault when the aftertreatment diesel particulate filter outlet temperature reading is greater than 800°C [1472°F] for 20 seconds. The active fault can illuminate the red STOP ENGINE lamp, disable active and stationary diesel particulate filter regeneration, close the EGR valve, reduce torque after extended operation, and trigger shutdown if engine protection shutdown is enabled.
The guided troubleshooting uses INSITE™ electronic service tool to read active fault codes, monitor three aftertreatment exhaust gas temperature sensors after idle stabilization, and confirm whether sensor values vary by more than 24°C or 43°F. Later checks cover injector inspection, exhaust outlet contamination, aftertreatment fuel injector flow where applicable, diesel oxidation catalyst face plugging, catalyst cracks, black smoke, and calibration revision history.
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