Cummins fault code 649 is the Cummins ISX11.9 CM2250 diagnostic document for the engine oil change interval maintenance monitor, logged as SPN 1378, FMI 31 with a maintenance lamp. This is a maintenance reminder only with no effect on performance; the ECM flashes the maintenance lamp to signal that the oil and filter need changing. It sets when the programmable Maintenance Monitor lubrication oil drain limit is reached, and clears after the Maintenance Monitor feature is reset with the INSITE electronic service tool. This DiagTechPro library page outlines what the official Cummins troubleshooting procedure contains before you download the full PDF.
Cummins fault code 649 document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | Maintenance Reminder — DTCs |
| Fault code / SPN / FMI | 649 / SPN 1378 / FMI 31 |
| PID / Lamp | S115 / Maintenance |
| Year / Revision | Not stated in the extract |
| 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
- Conditions for Clearing the Fault Code
- Shop Talk and troubleshooting steps
Applicable truck models and engines
This Cummins DTC applies to ISX11.9 CM2250 (2010-12) and ISX12 CM2250 (2010-12) engines, and the shared circuit information also references the ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 platforms. Always match the engine oil change interval wiring against the OEM diagram before testing, and confirm the diagnosis with the Cummins INSITE electronic service tool. Full engine specifications are published on the official Cummins website.
Who needs this Cummins fault code 649 manual
Workshop technicians, fleet maintenance teams and owner-operators diagnosing a engine oil change interval concern on ISX11.9 or ISX12 CM2250 engines use this document to read the CM2250 diagnostic conditions, the action the ECM takes, and the exact steps to clear the code.
The complete PDF (6 pages) is available in the DiagTechPro manuals library; a free account is required to download it. This reference copy helps technicians prepare parts and test steps before servicing the engine.
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