Is Your Vehicle Sidelined by a Faulty Engine Computer?
A failing Engine Control Module (ECM) can bring your entire vehicle to a halt, causing immense frustration and diagnostic headaches. If you’re experiencing baffling issues like a no-start condition, intermittent stalling, a persistent check engine light, or erratic behavior, the problem often lies with the vehicle’s central computer. This expertly prepared ECM is the definitive solution to get your vehicle running reliably again, without the exorbitant costs and delays of a dealership visit.
Common Symptoms & Your Solution
A bad ECM can manifest in numerous ways. You might be dealing with one or more of the following problems:
- Vehicle will not start or is very hard to start
- Check Engine Light is on with no clear cause or with communication error codes (U-codes)
- Poor engine performance, misfires, or reduced fuel economy
- Erratic automatic transmission shifting
- Stalling for no apparent reason while driving or at idle
Instead of guessing with used parts or navigating complex programming procedures, this unit offers a direct path to a reliable repair. We provide a professionally Programmed 2009 GMC Envoy ECM that is flashed specifically to your vehicle’s Vehicle Identification Number (VIN). This critical step ensures that all systems—from the engine and transmission to the anti-theft security—function exactly as the manufacturer intended.
Features & Tangible Benefits
- ✔ VIN-Specific Programming Included: We flash the module with the latest GM software updates using your VIN. This means it arrives ready for a true plug-and-play installation, saving you hundreds in programming fees.
- ✔ Restored Performance & Efficiency: With factory-correct calibrations, your engine’s fuel delivery, ignition timing, and emissions systems will operate at peak efficiency, restoring lost power and fuel economy.
- ✔ Direct-Fit OEM Replacement: Guaranteed to fit and function perfectly in the specified vehicles without any need for modification. It directly replaces a wide range of service numbers, including 12636659, 12639300, 12628993, and more.
- ✔ Cost-Effective Dealership Alternative: Get a fully functional, correctly programmed module for a fraction of the price you’d pay at a new car dealership.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: Why VIN Programming is Non-Negotiable
In modern GM vehicles, the ECM is more than just an engine controller; it’s the central hub of a complex data network. It communicates with the transmission, body control module, anti-lock brakes, and even the instrument cluster. Simply installing a used ECM from another vehicle will almost always result in a no-start condition due to the anti-theft system (VATS/Passlock). Our VIN programming service not only matches the engine and transmission calibrations but also syncs the foundational security data, making the installation process as seamless as possible for you.
Frequently Asked Questions
Do I need to do any additional programming myself?
No. This ECM comes fully programmed to your vehicle’s VIN. In most cases, it is a simple plug-and-play installation. Some vehicles may require a simple, key-on/key-off security relearn procedure that takes about 30 minutes and does not require any special tools. We can provide instructions for this if needed.
Where do I provide my vehicle’s VIN?
Please enter your 17-digit VIN in the designated field on the checkout page. You can also reply to your order confirmation email with the VIN. We cannot ship your order until we receive this information.
How can I be sure this fits my exact vehicle?
This ECM fits a wide range of GM models. Please review the detailed fitment list on this page. Providing your VIN is the best way to guarantee you receive the correctly programmed part for your specific make, model, and options.
What if my original part number is not 12630464?
That’s okay. This ECM is a direct replacement for many different service numbers, including 12636659, 12639300, 12628993, and others listed. As long as your vehicle is on the compatibility list, this module will work once programmed to your VIN.
How do I know for sure that my old ECM is the problem?
While the symptoms listed are strong indicators of a failing ECM, we always recommend a thorough diagnosis by a qualified technician. Common checks include verifying power and ground signals to the ECM and checking for communication issues with a professional scan tool before ordering a replacement.
