How to Update ECM Parameters on a Cummins Engine Using a Diesel Laptop

Need to adjust idle shutdown, top speed, cruise control, or PTO settings on your Cummins-powered truck? With a diesel laptop and the right diagnostic setup, you can easily update ECM parameters without paying a dealer.

Here’s a simple step-by-step guide to get it done.

🛠 What You’ll Need:

🔄 Step-by-Step: Change Engine Parameters

  1. Connect your adapter to the truck’s diagnostic port

  2. Launch your diagnostic software and connect to the engine

  3. Navigate to the ECM Settings or Parameters section

  4. Locate the setting you want to change:

    • Maximum vehicle speed

    • Idle shutdown time

    • Cruise control on/off

    • PTO speed or triggers

    • Engine fan or torque limits

  5. Select the parameter, make your changes, and click “Program” or “Write”

  6. Wait for confirmation, then power cycle the key

🔐 ECM Locked?

If your ECM is locked, contact tech support and they will help you get it removed.

👉 Need a diesel laptop scanner that supports Cummins parameter changes? Click here to shop kits

Back to blog

Leave a comment