Restore Peak Performance to Your GM Truck or SUV
Is your 2009 GMC Yukon XL 1500 running rough, stalling, or displaying a persistent check engine light? These are common indicators of a failing Engine Control Module (ECM), the electronic brain of your vehicle. A faulty ECM can cripple your vehicle’s performance, fuel economy, and reliability. This replacement Engine Control Module, part number 12629009, is the definitive solution to get your vehicle operating precisely as it did from the factory.
From the Diagnostic Bay
We had a 2009 Silverado 2500 in the shop with a persistent P0300 random misfire code that no one could solve. The owner had already replaced spark plugs, wires, coils, and even injectors. After hooking up our professional scan tool, we noticed the fuel trim data was erratic and injector pulse widths were inconsistent across all cylinders. Instead of just guessing, we scoped the injector driver circuits directly at the ECM. We found that the ECM’s internal drivers were failing, causing the erratic commands. A new, properly programmed ECM solved a problem that had cost the owner hundreds in unnecessary parts. This highlights why correctly identifying a bad ECM is crucial.
Is Your Vehicle Showing Signs of a Failing ECM?
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Transmission shifting issues or harsh engagement.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Intermittent electrical problems that seem to have no other cause.
The Plug-and-Play Solution: Your 2009 Yukon XL 1500 ECM
Replacing an ECM is not as simple as swapping a mechanical part. The module must be programmed with your vehicle’s specific Vehicle Identification Number (VIN) and equipped with the latest software updates from General Motors. We handle this critical step for you. When you purchase this module, simply provide us with your VIN. Our technicians will flash the unit with the correct GM-certified calibration for your exact vehicle configuration. This ensures that once you receive the part, it is ready for installation without requiring expensive trips to the dealership for programming.
This unit is a direct replacement for part numbers 12629009 and 12625455, and it fits a wide range of GM vehicles from 2009-2010, including the Chevrolet Silverado, Suburban, Tahoe, Express Van, Cadillac Escalade, and GMC Sierra. Please verify the part number on your original module or consult our detailed fitment list to ensure compatibility.
Frequently Asked Questions
Do I need to program this ECM?
No. This ECM comes fully programmed to your vehicle’s VIN before we ship it. It is ready for installation right out of the box, saving you time and the high cost of dealership programming.
What information do you need from me?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. This is essential for us to load the correct software and calibrations for your specific engine, transmission, and options.
Where can I find my VIN?
Your VIN can be found on a metal plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. However, it’s crucial to ensure a proper diagnosis has been performed, as the light can be triggered by many other failing components. We recommend clearing all codes after installation.
Is any other procedure required after installation?
In many cases, a security relearn procedure (also known as a CASE relearn or anti-theft relearn) may be necessary. This is a simple process that can often be done without special tools and involves a sequence of key cycles. Instructions are widely available online for your specific model, or your mechanic can perform it in minutes.