Cummins 3684275 ECM Module
Cummins 3684275 is an ECM module identified from the original controller. If the old label shows this number, send that evidence with the engine information instead of relying on a catalogue picture.

The equipment notes connect 3684275 with CM871 ISX heavy trucks and the industrial diesel engine category. Check the CM871/ISX information against the old label and connector before using that lead for an order.
The connector and housing give another useful check. They can show that a close-looking Cummins module is not the same unit for the installation.
The Check Starts With The Engine Installation
Please include:
- old ECM label with `3684275` visible;
- connector and pin-side photo;
- engine model and equipment name;
- housing and mounting-point photos;
- notes about damage or previous changes;
- quantity and destination country.
If the machine is unavailable, send the clearest old-unit photos first and explain what information is missing. That is better than filling an uncertain engine model into the order.
Compare Before You Choose
The part number, connector and engine application should agree. If one detail is different, stop the order and check the old ECM again before treating 3684275 as the correct module.
Quick buying check
Buy this 3684275 unit only after the old label number, connector shape, housing view, and equipment information match your machine photos.
Related Products
Browse more Cummins products and compare the old part number, connector, and equipment information before ordering.