Is your GMC Sierra 3500 or other GM vehicle suffering from frustrating engine problems? A faulty Engine Control Module (ECM) can bring your workhorse to a halt, causing everything from poor fuel economy and check engine lights to a complete no-start condition. Get your truck back on the job with this professionally programmed ECM, designed to restore factory performance and reliability. This isn’t just a part; it’s a direct solution that arrives ready for installation, saving you from expensive dealership programming fees and extended downtime.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a failing engine computer is the likely culprit. This unit is the definitive fix for problems such as:
- Intermittent or complete no-start conditions
- Poor engine performance, hesitation, or stalling
- Reduced fuel economy
- Active Check Engine Light with communication codes (e.g., U0100)
- Misfire codes (P0300-P0308) or injector circuit codes (P0201-P0208) that aren’t resolved by replacing other parts
- Erratic transmission shifting or other module communication issues
Our 2009-2010 Sierra 3500 ECM 12629009 is programmed with the latest GM software updates specifically for your vehicle’s VIN, ensuring a seamless and effective repair.
Features & Benefits
- ✔ Plug & Play Installation: This ECM arrives pre-programmed to your vehicle’s unique VIN. No extra trip to the dealer is required.
- ✔ Updated GM Software: We flash the module with the newest calibrations from General Motors, often correcting factory bugs and improving performance.
- ✔ Guaranteed Compatibility: A direct-fit replacement for part numbers 12629009 and 12625455, ensuring perfect integration with your vehicle’s systems.
- ✔ Restored Performance: Get back the smooth idle, crisp throttle response, and optimal fuel efficiency you depend on.
- ✔ Cost-Effective Solution: Avoid the high labor costs and markups associated with dealership computer replacement.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
Many people are tempted to grab a used ECM from a salvage yard to save money, but this often leads to more problems. A computer from another vehicle contains the wrong VIN, security information, and option content (like engine size or transmission type). This mismatch prevents the vehicle from starting and can cause communication errors across all modules. Our service eliminates this gamble. By programming the 2009-2010 Sierra 3500 ECM 12629009 to your exact VIN before it ships, we ensure the module is a true plug-and-play component that correctly communicates with your truck’s entire electronic network from the moment you install it.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically reply to your order confirmation email or follow the instructions provided after checkout. We cannot ship the part until we receive your VIN.
Is any additional programming required after installation?
No. This ECM is delivered fully programmed and ready for installation. In most cases, you will not need any additional programming. However, some vehicles may require a simple security relearn procedure, which can be done without special tools and typically takes 10-15 minutes. Instructions are readily available online for this process.
Will this fix my specific check engine light codes?
This 2009-2010 Sierra 3500 ECM 12629009 is a common solution for a wide range of diagnostic trouble codes, especially communication and internal processor faults. While it is the correct part for these issues, we always recommend a proper diagnosis by a qualified technician to ensure the ECM is the root cause of your problem before ordering.
Where is the ECM located on my vehicle?
On most GM trucks and SUVs from this era, including the Sierra and Silverado, the ECM is located in the engine compartment, typically on the driver’s side front fender or near the airbox. On GM vans like the Express and Savana, it is often found in the left rear of the engine compartment.
Is this a new or used part?
This is a quality, inspected, and tested used OEM part that has been programmed with the latest software for your vehicle, ensuring reliable performance and perfect fitment.
