This Cummins 3348 troubleshooting document is a 13-page diagnostic procedure for Fault Code 3348 on Cummins CM2250 engines. It explains the red STOP lamp fault, the calculated turbocharger differential pressure condition, likely restrictions, sensor checks, oil inspection steps, ECM calibration review, and repair validation with INSITE™.
Official Cummins 3348 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250; file group lists ISB6.7 CM2250 (2010-12) |
| System/Group | DTCs; Turbocharger 1 Compressor Inlet Pressure Circuit |
| Publication no. | Associated bulletin numbers shown: 4022250 and 2883445 |
| Year/Revision | Last modified 11-Jun-2010 and 18-Jan-2011; file year unknown |
| Pages | 13 |
| 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
- FAULT CODE 3348 – Turbocharger 1 Compressor Inlet Pressure – Data Valid But Below Normal Operating Range – Most Severe Level
- 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 crankcase ventilation system
- Guided Step 3 – Check the intake system
- Guided Step 4 – Check for oil in the compressor discharge pipe
- Guided Step 5 – Check ECM calibration and clear fault codes
- Guided Step 6 – Idle the engine to validate the repair
Applicable truck models
The extract identifies coverage for Cummins ISX11.9 CM2250, ISX15 CM2250, and GX CM2250 engines through associated procedures for the charge-air cooler, turbocharger, ECM calibration code, and intake manifold pressure/temperature sensor. The file information also labels the group as ISB6.7 CM2250 (2010-12) DTCs, but the visible procedure text references the ISX11.9 CM2250/ISX15 CM2250 turbocharger compressor inlet pressure circuit. See the engine manufacturer at Cummins official website.
Who needs this Cummins 3348 troubleshooting manual
This manual is useful for diesel technicians, fleet maintenance teams, and workshop owners diagnosing SPN 1176 FMI 1/1, red STOP ENGINE lamp events, power derate, or shutdown complaints linked to Fault Code 3348. It supports checks for crankcase filter restriction, air intake filter restriction, crankcase breather tubes, Fault Code 555 or 556, Fault Code 125, intake manifold pressure sensor accuracy, turbocharger oil carryover, charge-air cooler oil, and ECM calibration revision status.
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