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You must order a GM E41 Controller Modification Service

We can now sell the L5P tuning to the public as long as the ECM and TCM are the original from the truck.
Also, the truck needs to be tuned before anything is done to the truck.

***HP Tuners ECM WILL NOT work with EZ Lynk. Contact Controller Diagnostics regarding an ECM. If using a new/core ECM, it must have the VIN programmed by GM tools.***

***Single power levels only at this time. Price includes LIFETIME link.***

Once you have placed the order for EZ Lynk tuning, you will receive a confirmation email and a second email stating your order has been PROCESSED. After you have received the email stating your order has been PROCESSED, please carefully read and follow the steps below.

1. Connect the Auto Agent to the OBDII port, and then turn the ignition to the RUN position.
2. Connect to the EZ Lynk WiFi.
3. Open the Auto Agent app.
4. You should see a prompt stating your VIN is set up to link with tech@cttttuning.ca.
5. Click the Lynk button.
6. Once linked, click the Main Menu button in the upper left corner. Click Vehicles, and then ECU Profiles.
7. You should now be able to see the available profiles shared to you.

If you manually linked your vehicle to CTT Tuning before your order has been processed, this will disrupt the sharing process. To access the tune files, unplug the Auto Agent from the OBDII port, and remove the vehicle from your Garage on the EZ Lynk app. Once the vehicle has been removed from your account, follow the steps above.

If you have modified the fuel system (injectors or injection pump) you will initially receive tuning for a STOCK fuel system. Please wait to flash the vehicle until you have received the proper tuning for those modifications.

If you have a 68RFE transmission, you MUST follow the transmission relearn procedure noted in the instruction manual, regardless if you’re installing transmission tuning or not!

If you have questions or concerns with the tuning itself, please contact us at 888-855-5015, or support@ctttuning.ca. Click here for the EZ Lynk instruction manual.

If you have questions or complications with the EZ Lynk Auto Agent or the EZ Lynk app such as difficulty connecting to the Auto Agent or issues after a firmware update, please contact EZ Lynk at 877-207-5530 or support@ezlynk.com.

Additional information

Device Options

AutoAgent & Tuning, Tuning Only

Power Level

3 Tune Pack, 450HP, 500HP, 600HP

ECM Type

Original ECM, Core ECM (not original to the truck)