Is Your 2009-2010 Silverado 3500 Running Rough?
If your powerful workhorse is suddenly plagued by stalling, poor fuel economy, a persistent check engine light, or a complete no-start condition, the problem might be deeper than a simple sensor. The Engine Control Module (ECM), often called the engine computer, is the brain of your truck’s operation. It controls everything from fuel injection and ignition timing to transmission shifting and emissions. When it begins to fail, it can cause a cascade of confusing and frustrating issues that can be difficult to diagnose.
This replacement Engine Control Module, part number 12629009 (also compatible with 12625455), is the definitive solution to restore your truck’s factory performance and reliability. It’s not just a part; it’s a complete fix. We take the guesswork out of the repair by pre-programming the module specifically for your vehicle using your VIN. This ensures that it arrives with the latest GM software updates, ready for a straightforward installation.
From the Diagnostic Bay
We had a 2010 Sierra 2500 with the 6.0L come in on a tow truck. The owner had spent a fortune chasing what he thought was a fuel delivery problem. He’d replaced the fuel pump, injectors, and multiple sensors, but the truck would still randomly stall and refuse to restart for hours. The check engine light would throw a variety of codes that didn’t seem related. After hooking up our professional scan tool, we noticed the ECM was intermittently losing communication. The internal processors were failing under heat. We installed one of these VIN-programmed modules, performed the security relearn, and the truck fired up instantly and ran perfectly. It’s a classic case where the central computer was the root cause, making all the other components seem faulty.
Symptoms of a Failing 2009-2010 Silverado 3500 Engine Computer
- ✔ Check Engine Light: The light is on, and you may have multiple, seemingly unrelated trouble codes (DTCs), especially communication codes (U-codes).
- ✔ No-Start Condition: The engine cranks but will not start, or it starts and immediately stalls.
- ✔ Poor Engine Performance: You may experience rough idling, hesitation during acceleration, engine misfires, or a significant loss of power.
- ✔ Reduced Fuel Economy: A faulty ECM can’t properly manage the air-fuel mixture, leading to a sudden and noticeable drop in MPG.
- ✔ Transmission Issues: The ECM works with the Transmission Control Module (TCM), and a failure can cause harsh shifting, delayed engagement, or getting stuck in a single gear.
- ✔ Intermittent Problems: Issues that appear and disappear, often getting worse as the engine bay heats up, are a strong indicator of a failing computer.
The Right Part, Programmed Correctly
Don’t settle for a generic module from a salvage yard that will require expensive dealer programming. Our process is simple and effective. After your purchase, you provide us with your vehicle’s VIN. Our technicians then use this information to flash the module with the exact software and calibrations your truck needs. This process ensures compatibility with your specific engine, transmission, and factory options. This direct-fit, pre-programmed 2009-2010 Silverado 3500 Engine Computer gets you back on the road faster and with more confidence.
This module is a direct replacement for a wide range of GM trucks, vans, and SUVs from 2009-2010. Please verify your original part number (12629009 or 12625455) and consult the detailed fitment list to ensure perfect compatibility with your vehicle.
Frequently Asked Questions
What does the Engine Control Module (ECM) do?
The ECM is the central computer for your vehicle’s powertrain. It takes data from sensors all over the engine and vehicle, calculates the optimal fuel delivery, spark timing, and other critical functions, and then sends commands to actuators to make the engine run efficiently and powerfully.
Is this module truly plug-and-play?
Because we program the module to your VIN before shipping, it is nearly plug-and-play. However, on most GM vehicles of this era, you will need to perform a simple security relearn procedure after installation. This procedure pairs the new ECM to your vehicle’s anti-theft system and can typically be done in your driveway in about 30 minutes without special tools.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty ECM, then yes, this part will resolve the issue. It’s crucial to properly diagnose the problem first, as the check engine light can be triggered by many other components like sensors or wiring issues.
What is the difference between part numbers 12629009 and 12625455?
These are compatible service numbers used by GM. Part number 12629009 is often a later, updated version of 12625455. Our module is compatible with both and will be programmed with the latest software available for your specific vehicle, regardless of which part number was originally installed.