Restore Your HUMMER’s Brainpower and Performance

Is your 2007 HUMMER H2 running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM). As a technician with over two decades of experience under the hood, I’ve seen countless drivers frustrated by complex electrical issues. The ECM is the central computer of your engine, managing everything from fuel injection and ignition timing to transmission shifts. When it fails, your vehicle’s performance and reliability suffer dramatically. This isn’t just an inconvenience; it can be a serious safety concern.

We offer a direct, reliable solution: a replacement Engine Control Module, part number 12589297, professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures seamless communication with your H2’s other systems right out of the box. We load the latest, most stable software updates from GM, which often correct underlying factory bugs that may have contributed to the original failure. You get a part that’s not just a replacement, but a definitive fix that restores the precise operational parameters your HUMMER was designed to have.

Is Your H2 Showing These Red Flags?

A failing ECM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that the engine’s main computer is the culprit. In my shop, these symptoms are the most common signs leading to an ECM replacement.

• ✔ Unexplained Check Engine Light (CEL) illumination
• ✔ Engine stalling, stumbling, or hesitating during acceleration
• ✔ No-start or hard-starting conditions, especially when warm
• ✔ Noticeable decrease in fuel economy
• ✔ Rough or erratic automatic transmission shifting
• ✔ Communication error codes, such as U0100 (Lost Communication With ECM/PCM)
• ✔ Internal module failure codes, like P0601, P0602, or P0606

A Straightforward Guide to Installation

Installing your new 2007 HUMMER H2 ECM is a manageable job for a DIYer with basic tools. The key is that the programming is already done for you. On the H2, the ECM is located under the hood on the driver’s side, typically under the battery tray. Always consult a service manual for your specific vehicle, but here are the general steps:

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
2. Access the Module: You will likely need to remove the battery and the battery tray to gain clear access to the ECM.
3. Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damage.
4. Remove the Old ECM: Unbolt the old module from its mounting bracket and remove it from the vehicle.
5. Install the New ECM: Mount your new, pre-programmed module in the same location. Reconnect the electrical harnesses, ensuring they click securely into place.
6. Reassemble: Reinstall the battery tray and the battery. Reconnect the negative battery terminal.
7. Perform Security Relearn: Many GM vehicles of this era require a simple security relearn procedure to sync the new ECM with the anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine.

Verified Vehicle Compatibility

This module is a direct replacement for part numbers 12589297, 12597121, 12603892, and 19210738. It is guaranteed to fit the following vehicles and configurations. Please confirm your vehicle is on this list before ordering.

By purchasing this pre-programmed 2007 HUMMER H2 ECM, you’re not just buying a part; you’re buying a complete, hassle-free solution to get your truck back to its factory-best condition. Don’t let a faulty computer keep you off the road.