Get Your Rugged H3 Running Right Again
Is your Hummer H3 stumbling, stalling, or refusing to start? A failing Engine Control Module (ECM) can bring your tough, capable SUV to a dead stop, leaving you stranded and frustrated. The ECM is the brain of your vehicle, and when it fails, it can cause a cascade of confusing problems. This isn’t just an inconvenience; it’s a loss of the reliability you depend on. Restore your truck’s core performance with this direct-fit, fully programmed Engine Control Module, designed specifically for your 2009-2010 Hummer H3 ECM 12628993.
Common Symptoms & Your Direct-Fit Solution
A faulty ECM can manifest in various ways, often mimicking other sensor or component failures. If you’re experiencing any of the following, a failing computer is a likely culprit:
- Severe hesitation or stumbling during acceleration
- Unexplained stalling or rough idling
- Complete no-start condition with power to all other systems
- Check Engine Light (CEL) with communication error codes like U0100
- DTCs pointing to internal processor failure, such as P0601 or P0606
- Inconsistent or erratic automatic transmission shifting
This module is the definitive solution. We take the guesswork and high dealership costs out of the equation. By programming the unit to your vehicle’s specific 17-digit VIN before shipping, we deliver a component that’s ready to install right out of the box. You get the latest factory software updates from GM, ensuring your engine operates at peak efficiency and reliability.
Features & Benefits
- âś” Plug & Play Installation: Arrives programmed to your specific VIN, eliminating the need for expensive dealership flashing or special tools.
- âś” Optimized Performance: Loaded with the latest GM factory software updates to ensure peak engine efficiency, fuel economy, and emissions compliance.
- âś” Guaranteed Compatibility: A direct replacement for service number 12628993 and a wide range of interchangeable parts, ensuring a perfect fit for your Hummer H3.
- âś” Solves Frustrating Issues: The correct fix for common drivability problems, communication errors, and internal computer faults.
- âś” Peace of Mind Protection: This unit is backed by our one-year replacement warranty, giving you confidence in your repair.
An Expert Tip from Our Techs: Many H3 owners try to save a few dollars with a junkyard ECM, only to find it won’t work because of the vehicle’s anti-theft system (VATS/Passlock). Our pre-programming service syncs the module to your vehicle’s VIN before it ships. This critical step bypasses the security lockout, saving you a tow to the dealer and hundreds in programming fees. It’s the difference between a weekend project and a week-long headache.
Don’t let a bad computer keep your Hummer sidelined. This is your opportunity to restore the dependable performance you expect. By providing us with your VIN at checkout, you ensure that the 2009-2010 Hummer H3 ECM 12628993 you receive is perfectly matched to your vehicle’s systems. Get your truck back on the road and ready for its next adventure.
Frequently Asked Questions
Do I need to have this ECM programmed by a dealer?
No. The main benefit of our service is that we program the module to your vehicle’s VIN before we ship it. This means it arrives ready for installation, saving you a trip to the dealership and their associated programming fees.
What information do you need from me?
After you place your order, you will need to provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to load the correct, vehicle-specific software onto the module.
Is this a difficult part to install?
For someone with basic mechanical skills, this is a straightforward installation. It typically involves disconnecting the vehicle’s battery, unplugging the electrical connectors from the old ECM, removing it, and then installing the new one in the reverse order. It’s located on the RH firewall on the H3.
Will this fix my Check Engine Light?
If your check engine light is on due to a fault within the original ECM (like codes P0601, P0606, or U0100), then this replacement part will solve the problem. After installation, it is recommended to clear all codes with a standard OBD2 scanner.
What is a CASE Relearn and will I need one?
A Crankshaft Variation Relearn (CASE Relearn) may be required after installation to prevent a P0315 trouble code. This procedure syncs the new ECM with the crankshaft position sensor. Many mid-range scan tools can perform this procedure, or a qualified mechanic can do it for you.
Does this 2009-2010 Hummer H3 ECM 12628993 fit other vehicles?
Yes, this is a versatile module used across many GM vehicles from that era. Please check the detailed fitment list on this page to confirm it is the correct part for your specific make, model, and engine.