Is Your HUMMER H3 Stalling, Idling Rough, or Throwing Confusing Error Codes?
If you’re experiencing frustrating engine problems with your 2009 or 2010 HUMMER H3, a failing Engine Control Module (ECM) is often the culprit. As a technician with over two decades of experience, I’ve seen these symptoms countless times: a persistent Check Engine Light, sudden loss of power, poor fuel economy, or even a complete no-start condition. The ECM is the brain of your engine, and when it falters, the entire vehicle’s performance suffers. Don’t let a faulty computer keep your rugged H3 off the road.
The Simple, Reliable Solution: A VIN-Programmed ECM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a genuine GM Engine Control Module, service number 12625453, and professionally program it to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module communicates perfectly with your H3’s other systems, just like the original. We load the latest GM-certified software, which can often resolve drivability issues that older software versions didn’t address.
Expert Pro Tip: Check Your Connectors Before Installation
On the HUMMER H3, the ECM is located on the right-hand firewall, an area that can be exposed to moisture. Before you install your new module, take a moment to closely inspect the vehicle’s wiring harness connectors. I’ve seen perfectly good ECMs fail to work because of corrosion on the connector pins. Use a small brush and some quality electronic contact cleaner to gently scrub any green or white residue from the pins. A clean connection is essential for proper communication and will prevent future headaches.
Why Choose Our 2009-2010 HUMMER H3 ECM?
- ✔ Plug-and-Play Installation: Because we program the module to your VIN, it’s ready to install right out of the box. No expensive trip to the dealership for programming is required.
- ✔ Latest GM Software: Your ECM arrives with the most current software updates from General Motors, ensuring optimal engine performance, fuel efficiency, and emissions control.
- ✔ Guaranteed Compatibility: Simply provide your VIN at checkout, and we handle the rest. We guarantee it will be the correct, programmed part for your truck.
- ✔ Restores Original Performance: A new ECM can resolve a wide range of issues, from rough idle and hesitation to false sensor codes and transmission shifting problems.
Easy Installation Guide
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system capacitors to discharge.
- Locate the ECM: On your 2009-2010 HUMMER H3, the Engine Control Module is mounted to the firewall on the passenger side of the engine compartment.
- Disconnect the Harnesses: Carefully release the locking tabs and unplug the wiring harness connectors from the old ECM. Inspect them for any damage or corrosion as noted in our Pro Tip.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. It’s typically held in place by a few small bolts.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: Start your vehicle. The engine may run slightly differently for the first few minutes as it completes its internal relearn procedures. Your H3 is now ready to drive.
Guaranteed Fitment & Interchangeability
This module, part number 12625453, is a direct replacement for a wide range of GM vehicles. It is fully interchangeable with the following service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12622175, 12630464, and 12678512.
While this listing is focused on the HUMMER H3, this part also fits many other models, including:
- Cadillac CTS, DTS, SRX, STS, XLR
- Chevrolet Colorado, Corvette, Trailblazer
- GMC Canyon, Envoy
- Buick Lucerne
- Saab 9-7X
Please provide your VIN to ensure we deliver a perfectly matched and programmed module for your specific vehicle. Get your HUMMER H3 running like new again and order with confidence today.