2009-2010 HUMMER H3 ECM 12622175 Programmed to Your VIN

Is Your HUMMER H3 Acting Up? Get Back on the Road with Confidence.

If your 2009 or 2010 HUMMER H3 is suffering from baffling issues like a persistent check engine light, rough idling, stalling, or communication error codes (like the dreaded U0100), the problem often points directly to a failing Engine Control Module (ECM). As the brain of your vehicle, when the ECM falters, it can create a cascade of frustrating and seemingly unrelated symptoms. Don’t let a faulty computer keep your legendary H3 parked.

This is a direct-fit, professionally programmed Engine Control Module for your vehicle. We take the guesswork and the expensive trip to the dealership out of the equation. Simply provide us with your vehicle’s 17-digit VIN during checkout, and our technicians will flash this module with the latest, most stable software updates directly from GM. It arrives at your door ready for a straightforward installation.

The Real-World Solution for Common H3 Headaches

“A customer’s 2009 H3 came into my shop last month with a no-start condition that had two other mechanics stumped. It had a list of communication codes and a random misfire code that didn’t make sense. After confirming the power and grounds to the module were solid, we swapped in a pre-programmed ECM. The truck fired up on the first try and ran perfectly. The original ECM, located on the firewall, had simply succumbed to years of heat and vibration—a common failure point I’ve diagnosed on dozens of these trucks.”

Key Symptoms of a Failing HUMMER H3 ECM:

• ✔ Persistent Check Engine Light (CEL) with various codes
• ✔ Engine stalling or refusing to start
• ✔ Noticeable decrease in fuel economy
• ✔ Rough or erratic engine performance and shifting
• ✔ Communication error codes on a scan tool (U-codes)
• ✔ Vehicle entering limp mode or reduced power mode

Plug-and-Play Installation: No Dealer Visit Required

Replacing the 2009-2010 HUMMER H3 ECM is a job most DIY mechanics can handle in their own driveway. Since we program the module before shipping, you won’t need any specialized scan tools for setup.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery.
2. Locate the ECM: On the H3, you’ll find the module mounted to the passenger side (RH) of the firewall in the engine bay.
3. Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harnesses from the old module.
4. Remove Old Module: Unbolt the old ECM from its mounting bracket on the firewall.
5. Install New Module: Bolt your new, pre-programmed ECM into place.
6. Reconnect Plugs: Securely plug the wiring harnesses into the new module. You should hear a ‘click’ as they lock.
7. Reconnect Battery: Re-attach the negative battery terminal.
8. Final Step: Start the vehicle. In some cases, a security relearn procedure may be necessary, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Your vehicle’s manual will have specific instructions.

Guaranteed Compatibility

This module is a direct replacement for part number 12622175 and is fully interchangeable with the following GM service numbers:

12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512

While this listing is focused on the 2009-2010 HUMMER H3 ECM, this versatile hardware also fits a wide range of other GM vehicles. Please verify your part number or contact us to ensure perfect fitment for models such as:

• Cadillac: CTS (2009), DTS (2009-2011), SRX (2009), STS (2009-2010), XLR (2009)
• Chevrolet: Colorado (2009-2012), Corvette (2009), Trailblazer (2009)
• GMC: Canyon (2009-2012), Envoy (2009)
• Buick: Lucerne (2009-2011)
• HUMMER: H3 (2009-2010)
• Saab: 9-7X (2009)