Is Your GM Truck or SUV Running Rough?
If your 2009-2010 Yukon, Silverado, Sierra, or other compatible GM vehicle is suddenly plagued by a check engine light, erratic engine behavior, poor fuel economy, or even a no-start condition, the culprit is often a failing Engine Control Module (ECM). As the central computer of your vehicle, the ECM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, it can cause a cascade of frustrating and potentially damaging problems. Don’t let a faulty computer keep you off the road. This direct-replacement engine computer, part number 12629009, is the reliable solution to restore your vehicle’s performance and peace of mind.
From the Diagnostic Bay
We had a 2010 Sierra 2500 with the 6.0L towed in last month. The customer had been chasing a random misfire (P0300) for weeks, replacing plugs, wires, and even a coil pack with no luck. The truck would run fine for a day, then start stumbling and losing power. After hooking up our diagnostic scanner and monitoring live data, we noticed the short-term fuel trims were wildly inconsistent, and the injector pulse width was erratic on several cylinders. All signs pointed away from the mechanical parts he had replaced and straight to the brain—the ECM. A quick check confirmed the original ECM was failing internally. We installed one of our VIN-programmed modules, performed the security relearn, and the truck ran perfectly. It’s a classic case where the symptoms seem mechanical, but the root cause is purely electronic.
Symptoms of a Failing 2009-2010 Yukon Engine Computer
A failing ECM can manifest in numerous ways, often mimicking other component failures. It’s crucial to recognize the signs to avoid replacing perfectly good parts. This module is the definitive solution for a wide range of issues affecting not just the Yukon, but also the Tahoe, Suburban, Escalade, and various GM pickups and vans from this era. If your vehicle is experiencing any of the following, a faulty ECM is a highly likely cause.
Common Failure Indicators
- ✔ Check Engine Light: An illuminated or flashing Check Engine Light is the most common symptom. You may see codes related to sensor circuits, injector drivers, or internal processor faults.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, either while driving or at idle. Random misfires that can’t be traced to spark plugs or coils are also a strong indicator.
- ✔ Poor Performance & Fuel Economy: A noticeable drop in power, acceleration, and a significant increase in fuel consumption often points to incorrect calculations being made by a failing ECM.
- ✔ No-Start Condition: In severe cases, the vehicle may crank but refuse to start. This can happen if the ECM is not properly controlling the fuel pump or ignition system.
- ✔ Harsh or Incorrect Shifting: The ECM works with the Transmission Control Module (TCM). A faulty ECM can send incorrect data, leading to erratic shifting, getting stuck in gear, or a loss of communication with the transmission.
- ✔ Communication Errors: Your mechanic’s scan tool may be unable to communicate with the ECM, which is a definitive sign of a major internal failure.
The Plug-and-Play Solution Your Vehicle Needs
Replacing an ECM isn’t just about swapping hardware. Modern vehicle security systems require the new module to be specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). Our service eliminates the need for an expensive trip to the dealership. We handle the critical programming for you before the part ever leaves our facility. Simply provide us with your VIN during checkout, and we will flash the module with the latest, most stable GM-certified software for your specific vehicle configuration. This ensures that when you receive your part, it’s ready for installation and will communicate seamlessly with all other modules in your truck or SUV.
This unit is a direct replacement for part numbers 12629009 and 12625455, guaranteeing a perfect fit and function for an extensive list of GM vehicles. By installing this professionally programmed ECM, you are not just fixing a problem; you are restoring your vehicle’s original factory performance, emissions compliance, and operational integrity.
Frequently Asked Questions
Do I need to do any programming after I receive this ECM?
No! We program the ECM to your vehicle’s VIN before shipping. It arrives ready for installation. However, you will need to perform a simple security relearn procedure (often called a ‘key relearn’ or ‘anti-theft relearn’) after installation, which typically takes 10-30 minutes and does not require any special tools. Instructions are readily available online for your specific model.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for the part to function.
Is this compatible with my vehicle?
This ECM is compatible with a wide range of 2009-2010 GM trucks, vans, and SUVs that use part numbers 12629009 or 12625455. Please review the detailed fitment list on this page to confirm compatibility with your specific year, make, model, and engine option.
What if my original part number is 12625455?
This part, 12629009, is a fully compatible and often updated replacement for the original 12625455 module. It will function identically once programmed to your VIN.
What is the warranty on this part?
All our electronic modules come with a standard warranty that covers any defects in the part itself. Please refer to our warranty policy page for specific details and duration.