Is Your GM Vehicle Running Rough? The Solution is Here.
If you’re dealing with a persistent Check Engine Light, unexplained stalling, poor fuel economy, or a vehicle that simply won’t start, the root cause is often the Engine Control Module (ECM). As the central computer of your vehicle, a failing ECM can create a cascade of frustrating and difficult-to-diagnose problems. This genuine used GM Engine Control Module, service number 12669908, is the reliable and cost-effective solution to restore your vehicle’s performance and get you back on the road with confidence.
We take the guesswork out of the repair. Unlike a generic module from a junkyard, this ECM is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures it has the correct software and calibrations straight from GM’s latest updates, making installation as seamless as possible.
From the Diagnostic Bay
We once had a 2018 Chevy Equinox come into the shop that was baffling its owner. It had intermittent stalling issues and a random cylinder misfire code that would come and go. The owner had already replaced the spark plugs, ignition coils, and even a fuel injector based on another shop’s advice, with no success. After hooking up our diagnostic scanner and monitoring live data, we noticed the injector pulse width for one cylinder was behaving erratically. It wasn’t a faulty injector; the command from the ECM itself was the problem. The driver circuit inside the original ECM was failing. We installed a VIN-programmed module just like this one, performed the necessary relearn procedures, and the Equinox ran perfectly. It’s a classic case of how a faulty ECM can mimic other component failures, costing you time and money on unnecessary parts.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ No-start or hard-start conditions, especially when the engine is warm.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough idling or engine misfires.
- ✔ Poor acceleration and overall loss of power.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Issues with automatic transmission shifting.
Why a VIN-Programmed 2018-2020 Camaro ECM is Essential
Modern vehicles are complex systems. The ECM doesn’t just manage the engine; it communicates with the transmission control module, body control module, anti-lock brake system, and crucially, the anti-theft system. Simply swapping a used ECM from another vehicle will result in a no-start condition because the modules won’t recognize each other. Our programming service resolves this critical issue. By flashing the module with your car’s unique VIN, we ensure the software is a perfect match for its specific options and security protocols. This unit arrives ready for the final handshake with your vehicle’s systems, which is completed through the post-installation relearn procedures.
Installation and Required Relearn Procedures
NOTICE: While we handle the primary programming, the final installation requires additional steps that are the responsibility of the installer. This is standard procedure for any ECM replacement on modern GM vehicles.
- Physical Installation: Disconnect the battery. Carefully remove the old ECM and install the replacement unit. Reconnect all electrical connectors and then reconnect the battery.
- Vehicle Theft Deterrent System (VTDS) Relearn: This is the most critical step. After installation, the vehicle will likely not start because the anti-theft system needs to recognize the new ECM. This procedure must be performed using a professional-grade scan tool with access to GM’s TIS2Web programming system. Most professional repair shops and dealerships can perform this service.
- Other Relearns: Depending on your specific vehicle, other procedures may be necessary. These can include a Crankshaft Position Variation Relearn, idle relearn, or setup for specific components like fuel injectors. These are also performed with a capable scan tool.
Guaranteed Fitment for Service Number 12669908
This module is a direct replacement for units with service number 12669908. Please verify the number on your existing module to ensure compatibility. This part is confirmed to fit a wide range of GM vehicles, including but not limited to:
- ACADIA 17 (VIN Z, 2.5L)
- ACADIA 18 (2.5L)
- ATS 17 (2.0L)
- CAMARO 18-20
- CTS 17 (2.0L)
- CRUZE 17-18 (Gasoline)
- EQUINOX 18 (1.5L, 2.0L)
- EQUINOX 19 (1.5L, ID 12669908)
- LACROSSE 18 (2.5L)
- MALIBU 17-18 (1.8L, 2.0L)
- REGAL 18 (2.0L)
- VOLT 17-18 (Gasoline)
Frequently Asked Questions
Why does this ECM need to be programmed to my VIN?
Programming the ECM with your Vehicle Identification Number (VIN) ensures it has the exact software, calibrations, and security information for your car’s specific features and anti-theft system. Without this step, the module will not be able to communicate correctly with other computers in the vehicle, resulting in a no-start condition.
What is a ‘theft deterrent relearn’ and can I do it myself?
The theft deterrent relearn is a security procedure that syncs the new ECM to your vehicle’s immobilizer system. It requires specialized equipment, specifically a tool that can access GM’s TIS2Web service. This is not a procedure that can be done with basic tools; it must be performed by a professional automotive technician or a dealership.
Is this a new part?
No, this is a high-quality, tested, and fully functional used part sourced from a salvaged vehicle. Each unit is inspected and verified to be in excellent working condition before being programmed and shipped. This provides a reliable, OEM-quality solution at a fraction of the cost of a new module.
Where do I find my vehicle’s VIN?
Your 17-digit VIN can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents. Please provide this number accurately to ensure correct programming.
What if my part number doesn’t match exactly?
For this component, it is critical that the service number (serv.no) on your old module matches 12669908. If the numbers are different, this module may not be compatible. Please double-check your original part before ordering.