Restore Peak Performance to Your GM Truck or SUV
Is your 2009-2010 Sierra 2500, Silverado, or other compatible GM vehicle suffering from perplexing engine issues? A faulty Engine Control Module (ECM), the brain of your vehicle’s engine management system, is often the culprit behind poor fuel economy, rough idling, stalling, or a persistent Check Engine Light. This replacement ECM, part number 12625455, is the definitive solution to restore your vehicle’s original performance, reliability, and efficiency.
Unlike generic modules that require expensive trips to the dealership for programming, this unit arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We flash it with the latest GM-certified software updates, ensuring optimal communication between all vehicle systems and correcting any factory software issues. This process guarantees a seamless installation and gets you back on the road faster.
I once had a 2009 Silverado 2500 in the shop with a random misfire code that just wouldn’t quit. The owner had already replaced the plugs, wires, and even an ignition coil based on advice from forums. The truck ran okay sometimes, but would stumble under load. After checking all the wiring and grounds, we hooked up our scope to the injector drivers at the ECM. We found that the signal for cylinder 3 was erratic. A quick swap with a known-good, programmed ECM like this one solved the problem instantly. The internal driver in the original module was failing intermittently—a classic case where chasing sensors costs more time and money than addressing the root cause.
Common Symptoms of a Failing Engine Computer
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or erratic idling.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Transmission shifting problems or harsh shifts.
- ✔ Communication errors with diagnostic scan tools.
Your Plug-and-Play 2009-2010 Sierra 2500 ECM Solution
This module is a direct-fit replacement for original part numbers 12625455 and 12629009. It is compatible with a wide array of GM vehicles from 2009-2010, including the Sierra, Silverado, Suburban, Tahoe, Escalade, Express, Savana, and more. By providing us with your VIN during checkout, you eliminate the guesswork and receive a component that is precisely calibrated for your vehicle’s engine, transmission, and factory options. The installation is straightforward for any competent DIY mechanic or professional technician. In many cases, a simple security relearn procedure (which can often be done without special tools) is all that’s needed to finalize the installation.
Frequently Asked Questions
Do I need to get this module programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN when you place your order, and the ECM will arrive ready to be installed, flashed with the latest GM software for your specific vehicle.
What is an ECM and what does it do?
The Engine Control Module (ECM) is the central computer that controls your vehicle’s engine. It takes data from sensors all over the engine (like oxygen sensors, crankshaft position sensor, etc.) and uses that information to control fuel injection, spark timing, and emissions systems to ensure the engine runs efficiently and powerfully.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the vehicle first, as the check engine light can be triggered by many other components, such as faulty sensors or wiring issues.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard, visible through the windshield. It may also be on a sticker on the driver’s side door jamb.
What is a security relearn procedure?
Most GM vehicles have an anti-theft system (Pass-Key, Passlock, or VTD) that communicates with the ECM. After installing a new ECM, you may need to perform a simple procedure to allow the new module to ‘learn’ your vehicle’s security key. This often involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Instructions are readily available online for your specific model.