Is Your GM Vehicle Running Rough, Stalling, or Showing a Check Engine Light?
The Engine Control Module (ECM), often called the engine computer, is the central command center for your vehicle’s engine. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems. From erratic idling and poor fuel mileage to a complete no-start condition, a faulty ECM can make your reliable truck, van, or SUV feel unpredictable. This replacement Engine Control Module, part number 12629009 (also replaces 12625455), is the definitive solution to restore your vehicle’s performance and reliability.
From the Diagnostic Bay
We once had a 2009 Sierra 2500 in the shop that was a real head-scratcher. It kept throwing random sensor codes—O2, MAF, throttle position, you name it. The owner had already spent a small fortune replacing sensors based on the codes. We hooked up our oscilloscope and found the 5-volt reference signal, which powers most of these sensors, was erratic and noisy. Instead of a clean, steady line, it looked like a mountain range. We traced it back and confirmed the ECM’s internal voltage regulator was failing, sending out bad data and causing good sensors to report errors. A new, correctly programmed ECM like this one solved every single issue instantly. It’s a powerful reminder that sometimes, the problem isn’t the soldiers, but the general giving the orders.
Common Symptoms of a Failing GM Engine Computer
- ✔️ Persistent Check Engine Light (CEL) that may be accompanied by multiple, seemingly unrelated trouble codes.
- ✔️ Engine performance issues such as stalling, hesitation, misfiring, or running rough.
- ✔️ A noticeable and unexplained decrease in fuel economy.
- ✔️ Automatic transmission shifting problems, including harsh shifts, delayed engagement, or getting stuck in one gear.
- ✔️ The engine cranks but refuses to start, even with a good battery and starter.
- ✔️ Intermittent loss of power to fuel injectors or ignition coils.
- ✔️ Inability for a diagnostic scan tool to communicate with the module.
The Critical Advantage of VIN Programming
Simply swapping an ECM from another vehicle will not work. Modern vehicles use sophisticated software and anti-theft systems that are tied directly to the Vehicle Identification Number (VIN). Our service eliminates the guesswork and the expensive trip to a dealership. When you order, you provide us with your vehicle’s VIN. We then flash this module with the latest, most up-to-date GM factory software specific to your exact make, model, and options. This ensures that the engine parameters, transmission strategy, and security systems all function exactly as they were designed to from the factory.
Your Solution: A Plug-and-Play 2009-2010 Escalade ECM
This module is tested to ensure full functionality and is ready for installation upon arrival. The physical replacement is straightforward for anyone with basic mechanical skills. In most cases, it involves disconnecting the battery, unplugging the electrical connectors from the old ECM, unbolting it from its bracket (typically on the driver’s side front of the engine bay), and installing the new one in its place. After installation, you may need to perform a simple security relearn procedure, which can typically be done without any special tools. This process re-syncs the new ECM with your vehicle’s anti-theft system and keys.
This module is a direct replacement for a wide range of popular 2009-2010 General Motors vehicles, including the Cadillac Escalade, Chevy Silverado, GMC Sierra, Tahoe, Suburban, Express vans, and more. Please verify your part number (12629009 or 12625455) and consult the detailed fitment list to ensure compatibility with your specific vehicle.
Frequently Asked Questions
What is VIN programming and why is it necessary?
VIN programming is the process of loading your vehicle’s specific software and security information onto the ECM using your unique 17-digit Vehicle Identification Number. It is essential for ensuring the module communicates correctly with all other systems in your vehicle, including the engine, transmission, and anti-theft system. Without it, the vehicle will not start or run properly.
How do I provide my VIN?
After placing your order, you can add your VIN to the order notes during checkout or reply to your order confirmation email with the information. We cannot ship your part until we receive the VIN.
Is this part difficult to install?
The physical installation is generally simple, requiring only basic hand tools to unbolt the old module and install the new one. However, you will likely need to perform a security relearn procedure afterwards. This procedure is straightforward and instructions can be easily found online for your specific model.
Will this fix my vehicle’s problem for sure?
This module will resolve any issues directly caused by a faulty ECM. If your vehicle exhibits the common symptoms listed, there is a very high probability this is the solution. However, we always recommend a proper diagnosis by a qualified technician to rule out other potential issues like wiring faults or bad sensors.
My original part number is 12625455. Will this work?
Yes. This ECM, part number 12629009, is a fully compatible and updated replacement for service part number 12625455. It will function identically once programmed to your vehicle’s VIN.