Get Your Hard-Working Sierra Back on the Road
When your 2009-2010 GMC Sierra 2500 is sidelined, your work stops. A failing Engine Control Module (ECM) is a common cause for debilitating issues like no-starts, erratic performance, and persistent check engine lights that can leave you stranded. This professionally programmed ECM is the definitive, reliable solution to restore your truck’s brain, getting you back on the job with confidence. We program the unit to your vehicle’s specific VIN with the latest GM software updates, ensuring a seamless and effective repair.
Common Symptoms & Your Solution
If your truck is experiencing any of the following, a faulty computer is the likely culprit. This module is designed to solve these exact problems:
- Complete no-start or intermittent starting issues
- Poor engine performance, hesitation, or stalling
- Drastically reduced fuel economy
- Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs) like U0100
- Erratic automatic transmission shifting or gear selection problems
Replacing your old module with our programmed 2009-2010 Sierra 2500 ECM is the most direct path to resolving these frustrating and costly issues, restoring the dependable performance you rely on.
Features & Benefits
- ✔ VIN-Specific Programming: Arrives pre-flashed to your truck’s exact Vehicle Identification Number, eliminating the need for an expensive trip to the dealership.
- ✔ Updated GM Software: We install the latest factory software updates from General Motors, which can correct original bugs and improve overall engine and transmission efficiency.
- ✔ Plug-and-Play Installation: Once installed, your vehicle will accept the new module, getting you back to work with minimal downtime. In some cases, a simple security relearn procedure may be required.
- ✔ Restored Drivability: Cures performance issues by restoring precise fuel injection, ignition timing, and transmission control for smooth, powerful operation.
- ✔ Broad Compatibility: A direct replacement for part numbers 12629009 and 12625455, fitting a wide range of GM trucks, vans, and SUVs.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
An Expert’s Perspective
As a technician with two decades of experience, I’ve seen countless hours wasted chasing symptoms when the root cause was a faulty ECM. The computer is the central command for your entire powertrain. By providing a programmed 2009-2010 Sierra 2500 ECM that’s already matched to your VIN, we’re not just selling a part—we’re delivering a complete solution. This process ensures all the other modules in your truck communicate correctly from the moment you turn the key, which is critical for the complex systems in these modern vehicles.
Frequently Asked Questions
Is this ECM truly ‘plug and play’?
Yes, this unit comes programmed to your VIN and is ready to be installed. In some GM vehicles, a straightforward security relearn procedure (often called a ‘key relearn’) may be necessary after installation. This can typically be done without special tools and instructions are widely available.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will then program the module before it is shipped to you. Please ensure the VIN is accurate to avoid delays.
My original part number is 12625455. Will this work?
Absolutely. This ECM, part number 12629009, is a fully compatible and updated replacement for the original 12625455 module. It will function identically in all listed applications.
Will this fix my check engine light?
If your check engine light is caused by an internal failure of the ECM or specific communication codes, this part will resolve the issue. However, if the light is on due to other problems (e.g., a bad sensor, wiring issue, or mechanical fault), those issues will need to be repaired separately.
Do I need any special tools for installation?
Installation typically requires only basic hand tools, such as a socket set, to disconnect the battery and remove the mounting bolts for the old ECM. No specialized diagnostic equipment is needed for the installation itself.