The fault code 3374 DTCs troubleshooting manual is the official Cummins procedure for diagnosing Roll Over Protection Brake Control Active – Condition Exists (SPN 1818, FMI 31/31). Certain anti-lock braking (ABS) controllers communicate with the ECM through the SAE J1939 data link. This code is set when the ECM receives a message from the ABS controller inhibiting cruise control operation under certain driving conditions. The no dashboard warning lamp behaviour and the exact conditions that set and clear the code are documented step by step.
fault code 3374 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9, ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 (2010-12) engines |
| System / Group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 3374 — SPN 1818, FMI 31/31 |
| Warning lamp | None |
| Year / Revision | 2010-12 (CM2250) |
| Pages | 6 |
| 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, ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 (2010-12) engines. Cruise control could possibly not operate while the condition exists. 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 fault code 3374 DTCs manual
Diesel technicians and workshop owners servicing CM2250 platform engines use this file to work SPN 1818 / FMI 31/31 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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