Is Your HUMMER H3 Acting Up?
If you’re dealing with frustrating issues like your 2009-2010 H3 stalling unexpectedly, refusing to start, or displaying a stubborn check engine light that won’t go away, a failing Engine Control Module (ECM) is often the culprit. As the central computer for your engine, when the ECM starts to fail, it can cause a cascade of confusing problems, from poor fuel economy and rough idling to incorrect transmission shifting. It’s a problem that can leave even seasoned DIYers scratching their heads.
A Real-World Diagnosis from My Shop
“A customer’s 2009 H3 came into my shop last month. It would crank but not start, and when it did, it ran rough and threw a dozen unrelated codes. The owner had already replaced multiple sensors and even the fuel pump. After checking the 5-volt reference circuit with my multimeter, we found it was erratic. We traced it directly back to an internally shorted ECM. A new, programmed module like this one had him back on the trail in under an hour, solving a problem that had plagued him for weeks.”
The Direct, Plug-and-Play Solution
Forget the expensive dealership visit and the hassle of finding a shop to program a new computer. This Engine Control Module is the straightforward fix you’ve been looking for. We take all the guesswork out of the repair by pre-programming the module specifically for your vehicle using your VIN. This ensures that it’s loaded with the latest, most stable software updates from GM, often correcting issues that were present in the original factory programming.
Why Choose Our 2009–2010 HUMMER H3 ECM?
- ✔ VIN-Programmed for You: Arrives ready for installation, flashed with your vehicle’s unique information.
- ✔ Latest GM Software: We load the newest software updates to improve performance and reliability.
- ✔ No Dealer Required: This is a true plug-and-play solution, saving you hundreds in dealer programming fees.
- ✔ Solves Common Problems: Directly addresses issues like no-start, stalling, erratic behavior, and persistent diagnostic trouble codes (DTCs).
- ✔ Broad Compatibility: A direct replacement for multiple GM service numbers.
Simple Installation Guide
You can get your Hummer back to peak condition right in your own driveway. Follow these simple steps:
- Safety First: Always disconnect the negative battery terminal before working on vehicle electronics.
- Locate the ECM: On your HUMMER H3, the ECM is mounted to the right-hand (passenger side) firewall in the engine bay.
- Disconnect Connectors: Carefully release the locking tabs on the wiring harnesses and unplug them from the module. Inspect the pins for any corrosion and clean if necessary.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed ECM into the same location.
- Final Steps: Securely plug in the wiring harnesses, ensuring the locking tabs click into place. Reconnect your negative battery terminal. Start the engine and let it run for a few minutes to allow the system to initialize.
Your VIN is Required for Programming
CRITICAL: To ensure 100% correct functionality, we must program this module with your vehicle’s 17-digit Vehicle Identification Number (VIN). Please provide your VIN during checkout or send it to us in a message after your purchase. We cannot ship your order until we receive this information.
Guaranteed Compatibility
This ECM is a direct replacement for part number 12630464 and is interchangeable with the following GM service numbers:
12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12678512
This module also fits a wide variety of other GM vehicles. Please verify the part number on your original module or consult the detailed fitment list below to confirm compatibility.