The Cummins fault code 3342 troubleshooting manual is the official Cummins procedure for diagnosing Engine Exhaust Gas Recirculation Cooler Efficiency – Data Valid But Below Normal Operating Range – Moderately Severe Level (SPN 4752, FMI 18). The exhaust gas recirculation (EGR) temperature sensor measures the temperature of the EGR gas flow after it exits the EGR cooler, and the electronic control module (ECM) uses that value to judge cooler efficiency. This code sets when the EGR cooler is not cooling the recirculated exhaust gas sufficiently. The amber warning lamp behaviour and the exact conditions that set and clear the code are documented step by step.
Cummins fault code 3342 document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9 CM2250 and ISX15 CM2250 (2010-12) engines |
| System / Group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 3342 — SPN 4752, FMI 18 |
| Warning lamp | Amber |
| Year / Revision | 2010-12 (CM2250) |
| Pages | 15 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Associated Procedures and Troubleshooting Steps
- Guided circuit-response and connector checks
- Conditions for Clearing the Fault Codes
Applicable truck models covered
This document applies to Cummins ISX11.9 CM2250 and ISX15 CM2250 (2010-12) engines. There is no effect on engine performance, but EGR cooling should be investigated. The guided steps rely on the Cummins INSITE electronic service tool to read active codes, monitor sensor data and confirm the repair. Always confirm engine and calibration coverage against the official Cummins engine support site before ordering parts.
Who needs this Cummins fault code 3342 manual
Diesel technicians and workshop owners servicing CM2250 platform engines use this file to work SPN 4752 / FMI 18 in the correct order instead of guessing at parts. It lists every conditions block, associated procedure and guided circuit-response check, with the connector and harness inspection points and the specifications each step expects. Following the tree in sequence keeps the repair accountable and lets the technician confirm the fault is cleared once and verified with the Cummins INSITE electronic service tool.
The full PDF, including the complete guided troubleshooting tree and specifications, is available in the DiagTechPro manuals library; a free account is required to download it.
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