Restore Your Truck’s Brainpower and Performance
The Engine Control Module (ECM), often called the engine computer, is the central command center for your 2009-2010 Silverado 3500. It meticulously manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When this vital component begins to fail, it can cause a cascade of confusing and frustrating problems, leaving your truck unreliable or even undriveable. This replacement Engine Control Module, part number 12625455, is the definitive solution to restore your vehicle’s factory performance and dependability.
Unlike solutions that require expensive trips to the dealership for coding, this ECM arrives at your door fully programmed to your specific vehicle. We use your Vehicle Identification Number (VIN) to flash the module with the latest, most stable GM factory software updates. This ensures perfect compatibility and optimal operation right out of the box, simplifying your repair and getting you back on the road faster.
From the Diagnostic Bay
We had a 2009 Sierra 2500 in the shop that was driving the owner crazy. It had a persistent check engine light, a rough idle, and would occasionally stall at red lights. The owner had already replaced the MAF sensor and two O2 sensors based on the codes, but the problem persisted. After hooking up our professional scan tool, we noticed the live data for the fuel trims was erratic and unresponsive. Instead of throwing more parts at it, we tested the driver circuits within the original ECM. Sure enough, the internal processor was failing, causing incorrect signals to be sent throughout the system. A properly programmed replacement ECM like this one solved all the issues instantly. It’s a powerful reminder that the root cause is often electronic, not mechanical.
Is Your Engine Computer Failing?
A faulty ECM can manifest in various ways, often mimicking other sensor or component failures. If you’re experiencing any of the following symptoms, a failing engine computer could be the culprit:
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough or erratic idling.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Unexplained loss of power.
The Perfect Solution for Your 2009-2010 Silverado Engine Computer
Choosing the right replacement part is critical for a lasting repair. This module is engineered to meet or exceed original equipment specifications. The most significant advantage is our professional VIN programming service. By providing your VIN during checkout, you eliminate the need for additional programming or calibration. The module integrates seamlessly with your truck’s existing systems, including the anti-theft (Passlock/VATS) system, though a simple security relearn procedure may be required after installation. This procedure can typically be done in your driveway without any special tools.
This ECM is a direct replacement for part numbers 12625455 and 12629009 and fits a wide array of 2009-2010 General Motors vehicles. While this listing is focused on the Silverado 3500, please verify the extensive fitment list to confirm compatibility with your specific model, such as the Sierra, Tahoe, Suburban, Escalade, Express Van, and more.
Frequently Asked Questions
Do I need to get this computer programmed?
No. This engine computer comes fully programmed to your vehicle’s specific VIN. We flash it with the latest GM software updates before shipping, so it’s ready for installation right out of the box.
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 the part until we have this information to program it correctly.
Where is the ECM located on my 2009-2010 Silverado?
On most Silverado and Sierra trucks from this era, the ECM is located in the engine compartment on the driver’s side, near the firewall or inner fender.
What is a security relearn and is it difficult?
A security relearn, or anti-theft relearn, synchronizes the new ECM with your vehicle’s security system. It is usually a simple procedure that involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this cycle three times. We include instructions to guide you through this straightforward process.
Is this part compatible with number 12629009?
Yes, this module is a direct, compatible replacement for both original equipment part numbers 12625455 and 12629009.
Will this fix my specific check engine light codes?
A failing ECM can cause a wide variety of trouble codes. While this part will resolve any issues originating from the computer itself, it’s crucial to ensure other components like sensors and wiring are in good condition. Proper diagnosis is key to a successful repair.