Is Your GM Vehicle Running Rough? The Engine Control Module is the Brain of Your Engine.
If your 2009 GMC Savana 3500, or another compatible GM vehicle, is experiencing baffling issues like poor fuel economy, stalling, a persistent Check Engine Light, or a complete no-start condition, the culprit is often the Engine Control Module (ECM). As the central computer for your vehicle’s powertrain, the ECM makes thousands of calculations per second to manage everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, the symptoms can be widespread and frustrating to diagnose.
This replacement Engine Control Module, corresponding to GM part numbers 12629009 and 12625455, is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This ensures that it arrives ready for installation, loaded with the latest factory software updates from GM, which can often resolve underlying drivability issues you didn’t even know were software-related.
From the Diagnostic Bay
We had a 2009 Silverado 2500 with the 6.0L engine come into the shop with a complaint of intermittent stalling and a random P0606 (Internal Control Module Processor Error) code. The owner had already replaced the throttle body and multiple sensors, spending hundreds of dollars with no success. After confirming power and grounds to the module were solid, we knew the ECM was failing internally. Instead of sending him to the dealer for a costly replacement and programming session, we sourced a correctly prepared module like this one. After installation and a quick security relearn, the truck ran perfectly. The pre-programming saved the customer significant time and money, solving a problem that had plagued him for months.
Symptoms of a Failing Engine Control Module
- ✔ Persistent Check Engine Light (CEL) with various trouble codes, especially U-codes or P06xx codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Rough or erratic idling.
- ✔ Automatic transmission shifting problems, such as harsh shifts or getting stuck in gear.
- ✔ Communication errors with diagnostic scan tools.
The Solution: A VIN-Programmed 2009 Savana 3500 ECM
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership or a specialized locksmith. Our process is simple and effective. Once you place your order, you provide us with your vehicle’s 17-digit VIN. Our technicians then use this information to flash the module with the exact software and calibrations your vehicle requires. This critical step ensures all onboard systems communicate correctly, restoring the precise engine management your vehicle had when it left the factory.
This module is a direct-fit replacement for a wide array of GM trucks, vans, and SUVs from the 2009-2010 model years, including the Chevrolet Silverado, GMC Sierra, Cadillac Escalade, and many more. By installing this correctly prepared ECM, you are not just replacing a part; you are restoring the core logic that makes your engine run efficiently and reliably.
Installation Note
While the physical installation is straightforward for most DIY mechanics, please be aware that after installation, your vehicle may require a security relearn procedure (often called a Passlock or Passkey relearn). This procedure syncs the new ECM with your vehicle’s anti-theft system and can typically be done without special tools. Instructions for this procedure are widely available online for your specific model.
Frequently Asked Questions
Do I need to have this ECM programmed?
No. This ECM comes fully programmed to your vehicle’s specific VIN before we ship it. Simply provide your VIN during or after checkout, and we handle the rest.
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 a placard on the driver’s side dashboard visible through the windshield.
Is this compatible with part number 12625455?
Yes, this module is a direct replacement and is fully compatible with vehicles that originally used part number 12625455.
Will this fix my specific problem?
If your vehicle has been properly diagnosed with a faulty ECM, this part is the correct solution. It resolves issues directly caused by a failing engine computer, such as internal processor errors, driver circuit failures, and communication faults.
What is a security relearn procedure?
It is a simple procedure that syncs the new ECM to your vehicle’s anti-theft system, allowing the engine to start. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this sequence three times. Specific instructions vary by model but are readily available online.