This Cummins code 3242 document is a troubleshooting procedure for the aftertreatment diesel exhaust fluid tank heater fault. It explains the circuit, fault conditions, effects, likely causes, INSITE™ checks, coolant inspections, heater valve testing, ECM calibration review, and fault clearing steps for CM2250 applications.
Official Cummins code 3242 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated coverage shown for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, and other listed engine models |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs |
| Publication no. | Not stated; associated bulletin number for ISB6.7 CM2250 is 4022254 |
| Year/Revision | Last Modified: 07-Dec-2010; overview section Last Modified: 11-Jun-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 aftertreatment diesel exhaust fluid tank heating system
- Guided Step 3 – Check the aftertreatment diesel exhaust fluid tank heater operation.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins electronic engine and aftertreatment systems listed in the procedure, including ISB6.7 CM2250 and related CM2250 platforms. The associated procedures table also names ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, QSB6.7 CM2250, plus CM2220, CM2150, and CM876 engines where ECM Calibration Code procedure 019-032 is referenced. Vehicle-level tank heater valve location and coolant line routing depend on the OEM service manual. For manufacturer information, visit Cummins official website.
Who needs this Cummins code 3242 manual
Mechanics, fleet technicians, and workshop owners need this Cummins code 3242 manual when an amber CHECK ENGINE lamp or MIL is linked to SPN 3363 FMI 7. It is most useful when DEF tank temperature does not rise after the heater is commanded ON, especially where frozen diesel exhaust fluid can disable aftertreatment DEF injection.
The procedure directs technicians to read related fault codes with INSITE™ electronic service tool, inspect diesel exhaust fluid tank heater coolant lines for leaks, kinks, restrictions, loose connections, and damaged seals, then verify engine coolant level. It also uses the “Diesel Exhaust Fluid Doser System Heater Test” under “ECM Diagnostic Tests” to confirm whether the diesel exhaust fluid tank heater control valve is stuck closed, slow to respond, or unable to fully open. Final steps compare ECM code and revision information with ECM Calibration Revision History and use Reset All Faults or the required operating conditions to clear the diagnostic.
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