The Cummins fault code 3389 troubleshooting manual is the official Cummins procedure for diagnosing Exhaust Gas Recirculation (EGR) System – Abnormal Rate of Change (SPN 411, FMI 0/16). The ECM compares measured EGR flow against commanded EGR flow using the differential pressure sensor circuit. This code sets when the measured EGR flow does not meet the commanded EGR flow for 30 seconds. The amber warning lamp behaviour and the exact conditions that set and clear the code are documented step by step.
Cummins fault code 3389 document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISB6.7 CM2250 (2010-12) engines, within the shared CM2250 differential pressure sensor diagnostics |
| System / Group | ISB6.7 CM2250 (2010-12) / DTCs |
| Fault code | 3389 — SPN 411, FMI 0/16 |
| Warning lamp | Amber |
| Year / Revision | 2010-12 (CM2250) |
| Pages | 17 |
| 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 ISB6.7 CM2250 (2010-12) engines, within the shared CM2250 differential pressure sensor diagnostics. EGR valve actuation will be disabled while the fault is active. 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 3389 manual
Diesel technicians and workshop owners servicing CM2250 platform engines use this file to work SPN 411 / FMI 0/16 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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