The Brain of Your Engine, Restored.
Is your 2009-2010 GM truck, van, or SUV suffering from mysterious and frustrating issues? Problems like stalling, poor fuel economy, a persistent check engine light, or even a complete no-start condition often point to a single, critical component: a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it falters, the entire vehicle’s performance and reliability are compromised.
This replacement Engine Control Module, compatible with part numbers 12625455 and 12629009, is the definitive solution to get your vehicle running like new. We take the guesswork and high dealership costs out of the equation. Before this module ships, our experts will program it with the latest official GM software, precisely calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that all factory settings, from engine parameters to anti-theft systems, are correctly configured for a seamless installation.
From the Diagnostic Bay
We had a 2009 Silverado 2500 in the shop that was driving the owner crazy. It had an intermittent stalling issue and a check engine light for a random misfire that would come and go. The owner had already replaced the spark plugs, wires, and even a fuel injector based on another shop’s advice, with no success. After hooking up our professional scan tool, we noticed the data stream from the crank position sensor would momentarily drop out right before a stall, but testing the sensor and wiring showed they were perfect. The culprit? A failing driver circuit inside the original ECM. It couldn’t reliably process the sensor’s signal. We installed one of our pre-programmed modules, performed the quick security relearn, and the truck ran perfectly. It’s a classic case of how a faulty ECM can mimic other component failures, costing you time and money on unnecessary parts.
Symptoms of a Failing GM ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Trouble codes related to module communication (U-codes) or internal processor failure.
Why Choose Our 2009-2010 Escalade ECM?
Replacing the ECM on these GM vehicles isn’t just about swapping a box. The module must be correctly programmed to communicate with the other computers in your vehicle, such as the Body Control Module (BCM) and Transmission Control Module (TCM). Our service eliminates this difficult step. By providing us with your VIN, you receive a unit that is ready for installation right out of the box. This plug-and-play solution saves you a costly trip to the dealership for programming, which can often cost hundreds of dollars alone. We ensure your new 2009-2010 Escalade ECM is loaded with the most current software available from GM, which can often resolve factory bugs and improve overall vehicle operation.
Installation Process
Physically replacing the module is straightforward, typically requiring only basic hand tools to disconnect the battery, remove the mounting bolts, and unplug the wiring harnesses. After installation, while the engine programming is complete, you may need to perform a simple Security Relearn Procedure (also known as a Passlock or VATS relearn). This syncs the new ECM with your vehicle’s anti-theft system and keys. This procedure can usually be done without any special tools and typically involves a sequence of turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two to three times. Specific instructions for your vehicle are widely available online.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We handle all the necessary programming before shipping the part to you. We use your vehicle’s VIN to load the correct GM calibration file. You may only need to perform a simple security relearn procedure at home.
Where do I provide my VIN?
You can add your VIN to the notes section during checkout. If you forget, don’t worry! We will contact you via email after your purchase to request the VIN before we program and ship your module.
My original part number is 12629009. Will this work?
Yes, this module is the correct and updated replacement for both part numbers 12625455 and 12629009. It is fully compatible.
Is this a simple plug-and-play installation?
Yes, for the most part. The physical installation is plug-and-play, and the engine software is already loaded. The only additional step that may be required is the security relearn, which syncs the module to your keys and can be done without special tools.
How can I be sure the ECM is my problem?
The symptoms listed are very common for ECM failure. However, we always recommend a thorough diagnosis by a qualified mechanic to rule out any potential wiring, sensor, or power supply issues before replacing the module.
What vehicles does this fit?
This ECM fits a wide variety of 2009-2010 GM vehicles, including the Cadillac Escalade, Chevy Silverado, Suburban, Tahoe, Express Van, GMC Sierra, Yukon, Savana Van, and others. Please refer to the detailed fitment list on this page to confirm compatibility.