Is your GM vehicle suffering from perplexing engine issues, a persistent check engine light, or a no-start condition? The Engine Control Module (ECM) is the brain of your vehicle’s powertrain, and when it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. This genuine GM Engine Control Module, part number 12625455 (also compatible with 12629009), is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
From the Diagnostic Bay
I remember a 2009 Silverado 2500 that came in with random misfires and poor shifting. The owner had already replaced spark plugs, coils, and even the transmission fluid, chasing the problem for weeks. After hooking up our diagnostic scanner, we noticed communication dropouts with the engine controller. Instead of throwing more parts at it, we identified the root cause: a failing ECM. Once we installed a VIN-programmed module just like this one, all the phantom issues vanished. The truck ran like it just rolled off the factory floor. It’s a classic case of treating the disease, not just the symptoms.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Unexplained engine stalling or hesitation during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Engine misfires or rough idling.
- ✔ Vehicle entering ‘limp mode’ with reduced power.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Erratic automatic transmission shifting.
Your Plug-and-Play 2009 Savana 3500 ECM Solution
Don’t settle for a generic, unprogrammed module that will require an expensive trip to the dealership for coding. We take the hassle and guesswork out of the repair. When you purchase this ECM, we use the Vehicle Identification Number (VIN) you provide to flash the module with the latest, most stable software updates directly from GM. This ensures that the computer is perfectly matched to your vehicle’s specific configuration, including the engine, transmission, and factory options. The result is a seamless, plug-and-play installation that restores factory performance right out of the box.
This module is a direct replacement for a wide variety of popular GM trucks, vans, and SUVs from 2009-2010, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Escalade, and Express/Savana vans. Please verify your vehicle’s compatibility using the detailed fitment list on this page to ensure a perfect match.
Frequently Asked Questions
What is an ECM and what does it do?
The Engine Control Module (ECM) is your vehicle’s main computer. It controls critical functions like fuel injection, ignition timing, emissions systems, and transmission shifting to ensure optimal performance and efficiency.
Is this ECM ready to install when I receive it?
Yes! This ECM is programmed to your vehicle’s specific VIN before it is shipped. In most cases, this allows for a direct, plug-and-play installation without needing a trip to the dealer.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit VIN. We will provide clear instructions on how to do this. We cannot ship the part until we have programmed it with your VIN.
Will this fix my vehicle’s specific problem?
If your vehicle’s issues have been correctly diagnosed as a faulty ECM, this part is the solution. It is crucial to ensure a proper diagnosis has been performed, as other failing sensors or wiring issues can mimic ECM symptoms.
Do I need to perform any other procedures after installation?
In some vehicles, a security relearn procedure may be required to sync the new ECM with your vehicle’s anti-theft system. This is typically a simple process that can be done without special tools and instructions can be readily found for your specific model.