Is your vehicle suffering from frustrating issues like a persistent check engine light, poor fuel economy, stalling, or a no-start condition? These are common signs of a failing Engine Control Module (ECM), the central computer that manages your engine’s performance. Don’t let a faulty computer keep you off the road. This genuine used GM ECM 12669908 is the reliable and cost-effective solution to restore your vehicle’s proper function and drivability.
This isn’t just a part in a box. We take the guesswork out of the repair by pre-programming this module specifically to your vehicle using your VIN. Our technicians flash it with the latest, most stable software updates directly from GM, ensuring optimal performance and compatibility. This critical step saves you a trip to the dealership and the high costs associated with their programming services. Once you place your order, simply provide us with your VIN, and we’ll handle the complex software side before shipping it directly to you.
We had a 2018 Chevy Equinox come in with a complaint of intermittent stalling at stoplights and a check engine light that would come and go. The customer had already replaced the battery and spark plugs with no luck. Our scan tool pulled a U0100 code, indicating a loss of communication with the ECM. After verifying the wiring and power/ground circuits to the module were solid, we confirmed an internal fault in the original ECM. We sourced a quality used unit, a GM ECM 12669908, programmed it to the vehicle’s VIN, and installed it. After performing the security relearn procedure, the vehicle started right up and ran perfectly. The U0100 code was gone for good, and the customer was thrilled to have their reliable daily driver back without the massive expense of a new module from the dealer.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with various trouble codes
- ✔ Vehicle will not start or is very difficult to start
- ✔ Intermittent stalling or rough idling
- ✔ Noticeable decrease in fuel efficiency
- ✔ Poor engine performance, hesitation, or misfires
- ✔ Automatic transmission shifting problems
- ✔ Communication errors with diagnostic scan tools
Installation and Relearn Procedure
While we handle the programming, please be aware that installation requires a final step on your end. Due to the anti-theft systems on modern GM vehicles, a Security Relearn (also known as a vehicle theft deterrent relearn) must be performed after the module is installed. This procedure pairs the new ECM to your vehicle’s ignition and security components. Without it, the vehicle will not start. This procedure typically requires a professional-grade scan tool or access to GM’s TIS2Web programming system. It is the responsibility of the installer to complete this step. Additionally, other vehicle-specific procedures, such as a crankshaft position sensor variation relearn or injector flow rate programming, may be necessary depending on your exact model.
Why Choose a VIN-Programmed Module?
Choosing our pre-programmed GM ECM 12669908 provides a direct path to a successful repair. By matching the software to your VIN, we ensure all the specific calibrations for your engine, transmission, and emissions equipment are correct. This avoids the compatibility issues and potential performance problems that can arise from installing a non-programmed module from a salvage yard. Get the right part, with the right software, ready for final installation and relearn.
Frequently Asked Questions
What information do I need to provide?
After you complete your purchase, you must provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to program the ECM with the correct software and calibrations for your specific car.
Is this a new part?
No, this is a genuine, used OEM part that has been carefully removed from a salvaged vehicle. Each unit is inspected and then programmed to order, offering a reliable and affordable alternative to a new part from the dealership.
Will my car start immediately after I install this ECM?
No. After installation, you or your mechanic must perform a security relearn procedure to sync the ECM with your vehicle’s anti-theft system. The engine will not start until this step is completed.
What is a security relearn?
A security relearn, or vehicle theft deterrent (VTD) relearn, is a procedure that pairs the replacement ECM to your vehicle’s keys and security system. This is a required safety feature on all modern vehicles. It typically requires a professional scan tool or GM’s TIS2Web software.
How do I find my part number?
You can find the service number (serv.no) printed on a white label on your original ECM. Please verify that your original module has the number 12669908 to ensure compatibility.
Which vehicles does this part fit?
This ECM fits a wide range of GM vehicles from 2017-2019, including the Chevy Volt, Equinox, Malibu, Cruze; Cadillac ATS, CTS; Buick Regal, LaCrosse; and GMC Acadia. Please refer to the detailed fitment list on this page to confirm compatibility with your specific year, model, and engine option.