ECM SWAP — 22-24 CUMMINS 6.7L

Connect the bypass cable into the OBD port, then connect it to the green SGM strip under the dash. We recommend slot 5, as it gives the most direct connection to the CAN circuit.

Open the hood. The connector is on the driver side of the engine on the main engine harness, typically near the intake horn. Find the small connector with a dummy plug, remove the dummy plug and fit the J19 plug from your kit in its place.

With both cables installed, plug the EZ LYNK and the EZ LYNK harness into the OBD port. The harness has provisions for the SGM cable so everything connects properly.

With all connections secure, open the app. The vehicle should appear in the main menu.

It is critical to follow every step exactly as written. If the process is not completed properly you will have to reinstall the original ECM and start over.

From the main menu open the Functions tab, scroll to the bottom and select "Replace and Reprogram".

In the Remove and Replace (R&R) menu, follow the prompts to continue. The screen shows a log with the truck's current VIN, serial number and immobilizer data. Take a screenshot of it. If anything goes wrong, a technician may need this information to recover the truck's ECM.

Click Continue. When prompted to create a file, select Yes, then click Run in the top right corner. The app will say it is beginning the procedure. If it fails or does not start, check your cable connections first, as that is the most likely cause.

Then remove the battery charger, shut off the ignition and disconnect both batteries. You are ready to swap the ECM.

Not strictly required, but highly recommended for room to work, especially if you are less familiar with the process. Remove the several 10mm bolts and the 11mm nut on the intercooler boot clamp.

Cover the intercooler tube and the intake plenum so no debris enters the engine.

The ECM is held to the engine block by four 10mm bolts. Its two connectors are bolted in place: one with two 8mm bolts, the other with two 10mm bolts. Remove the connector bolts first.

Gently release the latch-style connectors. Be extremely careful with these latches: if they are damaged you cannot get a secure connection, which causes significant problems. They can be stubborn, so take your time. If they do not move easily, apply WD-40 to the slides, let it soak, and work them back and forth until they move freely.

With the connectors off and set aside, remove the four 10mm bolts holding the ECM to the block.

Disconnect the FCA connector on the back of the injection pump first. It is a tight area and the connector or sensor is easily damaged if left connected.

Rotate the ECM clockwise as you pull it up through the space normally occupied by the intake horn and intercooler tube, keeping the blue connector closest to the top. There are a lot of harnesses and lines here, so be patient and work the unit out carefully.

Check the part numbers on the new ECM are correct, and inspect both units for broken or bent pins and tabs, particularly if the replacement is a used part.

Reverse the removal steps, with the green connector facing down at the start of the installation. Navigate the ECM into place carefully to avoid damaging the pins: a bent pin causes performance issues and a broken pin makes the ECM unusable.

Bolt the ECM in place, reconnect everything you disconnected, and return all tabs and harnesses to their original positions.

This is a good time to clean any soot from the intake plenum and fit any EGR upgrades. Reinstall the intake horn.

Most importantly, remove every block-off cover so nothing is sucked into the engine on startup.

Connect both batteries. Connect the charger and confirm the truck has proper voltage. Confirm the J19 cable and the security bypass cable are still installed.

Turn the key to Run. Do not start the vehicle.

Open the app and use the chat function to tell your technician the ECM is swapped and you are ready for tune files. The technician sends the files to your account; select your preferred tune from the "ECU profiles" menu and follow the in-app download steps.

Return to the main menu and select "Replace and Reprogram". Click Continue to start the process.

At the menu offering "Create file", "Write info" or "Delete files", select Write info. Do not select anything else: any other option erases your stored information and you will have to reinstall the original ECM and start the whole process again.

You should see: "Finished writing the old ECU values to the new ECU. The Auto Agent will continue to detect this vehicle until the delete files command is run." If you do not, make sure you loaded a tune file first as instructed. If the process will not start, check your cable connections.

Keep the Auto Agent and J19 cables connected and the app open, then start the truck. It should start without issues. Let it run for at least two minutes so the immobilizer programs correctly.

With the truck confirmed running, perform the write function at least three more consecutive times so the immobilizer is fully programmed. You do not need to download a tune file each time; just repeat the write itself.

Verify the truck starts and runs one last time. Then return to "Replace and Reprogram", click Continue until you are back at the "Write, Create or Delete Files" menu, select Delete Files and follow the on-screen prompts.

If this final step is skipped, the EZ LYNK app will wrongly report the truck is in recovery mode and prompt you to load a file every time you connect.

If you run into any issues, contact your technician rather than EZ LYNK directly, as their ability to assist is limited.