The Cummins fault code 3348 troubleshooting document is a 4-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering turbo compressor inlet pressure (SPN 1176, FMI 1/1). This fault code sets when the calculated pressure differential across the turbocharger compressor seal falls below its normal operating range at the most severe level. This page summarises what the manual contains so a technician can confirm it matches the code before downloading.
Official document details
| Brand | Cummins |
| Model coverage | ISM & ISX CM871 (2007-09) |
| System / group | ISM CM871 (2007-09) / DTCs |
| Circuit | ISX and ISM Electronic Control Module (ECM) |
| Fault identifiers | SPN 1176 · Lamp RED · FMI 1/1 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Cummins fault code 3348 overview
This fault code sets when the calculated pressure differential across the turbocharger compressor seal falls below its normal operating range at the most severe level. The differential is derived from the difference between charge pressure and crankcase pressure. Verify the ECM calibration is correct before condemning parts.
The document lists possible causes including:
- A crankcase filter that needs to be changed
- An air intake filter that needs to be changed
- A plugged or restricted crankcase ventilation system
- Ice, snow, or mud temporarily blocking the draft tube
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models covered
This procedure applies to Cummins ISM and ISX engines built on the CM871 (2007-09) electronic control platform, as fitted by truck makers using this Cummins driveline. The ECM is on the fuel-system side of the engine; the crankcase breather and coalescing filter feed the draft tube checked in this tree. For wiring, connector, and CPL detail, refer to the Cummins official engine support site or the OEM service manual.
Who needs this Cummins fault code 3348 manual
Fleet technicians and workshop owners diagnosing low turbocharger compressor inlet pressure on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the turbocharger compressor circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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