Cummins Fault Code 649

10/12/2025

Overview

CODE

REASON

EFFECT

Fault Code: 649
PID: S115
SPN: 1378
FMI: 11/31
LAMP: Maintenance
SRT:

Change the engine oil and filter.

None on performance.

Cummins Fault Code 649 — Engine Control Module (ECM)

Circuit Description

The engine control module (ECM) informs the driver of a maintenance event by using the Maintenance Monitor feature’s lubrication oil drain limits.

Component Location

Not Applicable

Conditions for Running the Diagnostics

This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes

The Engine Control Module (ECM) detected the engine oil and filter required changing based on the programmable setting in the Maintenance Monitor.

Action Taken When the Fault Code is Active

The ECM illuminates the white MAINTENANCE lamp or flashes the amber CHECK ENGINE lamp, indicating a maintenance condition, immediately after the diagnostic runs and fails.

Conditions for Clearing the Fault Code

Use the recommended Cummins electronic service tool or equivalent to reset the Maintenance Monitor feature.
The ECM will turn off the flashing amber CHECK ENGINE lamp / MAINTENANCE lamp immediately after the diagnostic runs and passes.
The “Reset All Faults” command in the recommended Cummins electronic service tool or equivalent can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk

This fault code will only become active if the Maintenance Monitor is enabled in the recommended Cummins electronic service tool or equivalent. Make sure the oil and filter are changed before clearing the fault code.

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