How to Program a Hummer H3 Keyless Remote

Have you ever misplaced or broken your Hummer H3 keyless remote? Don’t worry! This article will walk you through the process of programming a new remote step by step. By following these instructions, you can avoid the cost and inconvenience of visiting a dealership or professional locksmith. Let’s get started!

Gather the Necessary Materials

Before you begin, make sure you have the following materials on hand:

  • A new, compatible keyless remote
  • Your vehicle’s owner’s manual
  • A jumper wire or paperclip

Locate Your Vehicle’s OBD-II Port

To program your remote, you’ll need to access your vehicle’s OBD-II port. This port is typically located under the driver’s side dashboard. Consult your owner’s manual if you’re having trouble locating the port.

Prepare Your Vehicle

Enter your vehicle and close all doors, including the trunk.

Insert your key into the ignition, but don’t turn it just yet.

Entering Programming Mode

  • Locate the two OBD-II port pins needed for programming mode. These pins are usually labeled 4 and 8. Check your owner’s manual for specific pin locations.
  • Connect the two pins with your jumper wire or paperclip.
  • Turn your ignition key to the “On” position (but don’t start the engine) and wait for the door locks to cycle. This indicates that your vehicle has entered programming mode.

Program the Remote

  • Press and hold the “Lock” and “Unlock” buttons on your new remote simultaneously for about 15 seconds.
  • Release the buttons when the door locks cycle again. This means that your remote has been successfully programmed.
  • If you have additional remotes to program, repeat steps 1 and 2 for each remote.

Test the Remote

  • Remove the jumper wire or paperclip from the OBD-II port.
  • Turn off your vehicle and remove the key from the ignition.
  • Test each button on your new remote to ensure proper function. If a button doesn’t work, repeat the programming steps.


If your remote doesn’t function as expected, try the following:

  • Double-check the connection between the OBD-II port pins.
  • Verify that the remote is compatible with your Hummer H3.
  • Replace the remote’s battery and attempt programming again.

Taking Care of Your Keyless Remote

To ensure your keyless remote continues to function properly, follow these tips:

  • Keep your remote clean and dry. Moisture and debris can damage the internal components.
  • Avoid dropping the remote or exposing it to extreme temperatures.
  • Replace the battery as needed to maintain optimal performance.

Replacing the Battery in Your Remote

Over time, the battery in your keyless remote will need to be replaced. To do this, follow these steps:

  • Carefully pry open the remote’s casing with a small flathead screwdriver.
  • Remove the old battery and note its orientation.
  • Insert the new battery, ensuring it’s positioned correctly.
  • Reassemble the remote casing and test the remote’s functionality.

Benefits of a Keyless Remote

Keyless remotes offer several advantages for vehicle owners, such as:

  • Enhanced security with unique codes that change with each use.
  • Increased convenience with remote locking, unlocking, and trunk release.
  • Panic alarm functionality to help locate your vehicle in a crowded parking lot or deter potential thieves.

Other Options for a Keyless Remote

If you’re having difficulty programming your Hummer H3 keyless remote or would like to explore alternative options, consider the following:

  • Consult a professional locksmith or dealership for assistance.
  • Purchase an aftermarket keyless entry system with more advanced features.

Programming a Universal Keyless Remote

If you’re unable to find a compatible remote for your Hummer H3, you can opt for a universal keyless remote. To program a universal remote, follow the manufacturer’s instructions, which typically involve a series of button presses and ignition key turns.


Programming a Hummer H3 keyless remote is a straightforward process that can save you time and money. By following the steps outlined in this article, you can enjoy the benefits of a keyless remote without the need for professional assistance. With proper care and maintenance, your keyless remote will provide years of reliable service.

ALSO SEE: How Many Gallons Does a Hummer H3 Hold?


  • Can I program a used keyless remote for my Hummer H3?

While it’s possible to program a used remote, it’s not recommended due to potential compatibility issues and the possibility of retaining old programming codes.

  • How do I know if my keyless remote is compatible with my Hummer H3?

Check the remote’s part number, which is typically listed on the back of the remote, and consult your owner’s manual or an online compatibility chart.

  • What should I do if my keyless remote stops working?

First, try replacing the battery. If the issue persists, reprogram the remote or consult a professional for assistance.

  • Can I have multiple keyless remotes programmed to my Hummer H3?

Yes, most vehicles allow for multiple remotes to be programmed, but there may be a limit. Consult your owner’s manual for specifics.

  • How often should I replace the battery in my keyless remote?

Battery life varies depending on usage, but it’s a good idea to replace the battery every 2-3 years to ensure optimal performance.

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