Restore Peak Performance to Your HUMMER H2
Is your 2007 HUMMER H2 suffering from frustrating issues like a persistent check engine light, erratic idling, stalling, or poor fuel mileage? These are classic signs of a failing Engine Control Module (ECM), the vehicle’s central computer. A faulty ECM can disrupt everything from fuel delivery to transmission shifting, making your powerful H2 feel unreliable. This replacement 2007 HUMMER H2 Engine Control Module is the definitive solution to restore your vehicle’s factory performance and dependability.
As a technician with over two decades of diagnostic experience, I’ve seen countless vehicle owners and even professional shops waste time and money replacing sensors when the root cause was the ECM itself. This module arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest, most stable software updates from GM, ensuring optimal communication between all vehicle systems. This eliminates the need for an expensive trip to the dealership for programming, making this a straightforward, cost-effective repair for both DIY enthusiasts and professional service centers.
A Technician’s Notebook: The Phantom Sensor Problem
A 2007 Sierra with the 6.0L (same ECM family as the H2) came into my bay with a whole list of seemingly unrelated sensor codes—throttle position, MAF, and O2 sensor circuit faults. The owner had already replaced all of them, but the check engine light kept coming back. A quick check with my multimeter on the sensor connectors revealed the problem: the 5-volt reference circuit supplied by the ECM was fluctuating wildly. The sensors were fine; the ECM’s internal power supply was failing. We installed a VIN-programmed ECM just like this one, and all the codes vanished instantly. It’s a textbook example of how a single failing module can mimic multiple other problems.
Is Your HUMMER Exhibiting These ECM Failure Signs?
A failing engine computer can cause a wide range of symptoms. If you’re experiencing any of the following, a faulty ECM is a likely culprit:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Diagnostic Trouble Codes (DTCs) related to internal processor failure, such as P0601, P0606, or P062F.
- ✔ Communication error codes like U0100 (Lost Communication with ECM).
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Unexplained drop in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start or intermittent starting issues.
A Straightforward Installation Guide for Your H2
Replacing the ECM on your HUMMER H2 is a manageable job for a confident DIYer. It’s located under the battery on the driver’s side of the engine bay.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Access the Module: Remove the battery and the battery tray. This will expose the ECM mounted below it.
- Disconnect Connectors: Carefully unplug the electrical connectors from the old ECM. There are typically release tabs that need to be pressed or lifted. Do not force them.
- Remove the Old ECM: Unbolt the old module from its mounting bracket.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Plug the electrical connectors firmly into the new module. Reinstall the battery tray and the battery, then reconnect the negative battery terminal.
- Final Check: Start the vehicle. The check engine light may be on initially. In most cases, it will clear after a few drive cycles. Some vehicles may require a security relearn procedure, which can often be done without special tools (consult your owner’s manual or a reliable online resource for your specific model).
Verified Compatibility for GM Vehicles
This module, part number 19210738, is a direct replacement for several original part numbers, including 12589297, 12597121, and 12603892. It is guaranteed to fit the following vehicles:
2007-2008 Cadillac Escalade, ESV, EXT (LH front under battery)
2007 Chevrolet Avalanche 1500, Suburban 1500/2500, Tahoe (LH front under battery)
2007 Chevrolet Silverado & GMC Sierra 1500/2500/3500 (New Style, LH front under battery)
2006-2007 Chevrolet Corvette (RH engine compartment)
2007 Chevrolet Impala & Monte Carlo (3.5L/3.9L, lower air cleaner box)
2007 Chevrolet Equinox & Pontiac Torrent (LH engine compartment)
2007 Pontiac G6 (3.5L/3.9L, LH front engine compartment)
2008 Pontiac G8 (6.0L)
2007 Saturn Aura (3.5L, RH firewall)
2007 GMC Yukon, Yukon XL 1500/2500, Sierra Denali (LH front under battery/engine compartment)
Frequently Asked Questions
What is VIN programming and why is it important?
VIN programming involves loading your vehicle’s unique 17-digit Vehicle Identification Number and its associated factory software onto the module. This ensures the ECM communicates correctly with your engine, transmission, anti-theft system, and other components. Without it, the vehicle will not start or run properly.
Do I need to do anything after installing this ECM?
This module is designed to be a plug-and-play solution. In some GM vehicles, a security relearn procedure (often called a ‘key cycle relearn’) may be necessary to sync the new ECM with your vehicle’s anti-theft system. This procedure typically doesn’t require special tools and can be found online or in your vehicle’s service information.
How do I provide my VIN after purchase?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s VIN. We cannot program and ship your module until we receive this information, so please provide it promptly to avoid delays.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the original ECM, then yes, this part is the correct fix. It is crucial to have a proper diagnosis performed to confirm the ECM is the source of the problem before ordering.
How can I be sure this part fits my vehicle?
Please check the compatibility list on this page. The most reliable method is to match the part number from your original module to one of the compatible numbers listed (19210738, 12589297, 12597121, 12603892). If you are unsure, contact us with your VIN before ordering and we can verify fitment for you.