Is Your GM Vehicle Running Rough, Stalling, or Showing a Check Engine Light?
A faulty Engine Control Module (ECM) can be the hidden cause of countless frustrating and expensive-to-diagnose issues. When the central computer of your vehicle’s engine management system begins to fail, it can manifest as poor fuel economy, random stalling, hesitation, a no-start condition, or persistent trouble codes that won’t clear. Don’t keep throwing parts at the problem. This genuine, used GM ECM 12669908 is the reliable and cost-effective solution to restore your vehicle’s performance and drivability.
This isn’t just a used part pulled from a shelf. We take the guesswork out of the repair by programming this module specifically for your vehicle using your VIN. This ensures that the computer has the correct calibration and the latest factory software updates from GM, a critical step that a local shop or dealer would charge a significant amount for. By providing us with your VIN upon purchase, you receive a module that is ready for the final installation and security relearn procedures.
From the Diagnostic Bay
We once had a 2018 Equinox in the shop that was driving its owner crazy. It had intermittent stalling issues and a P0606 (ECM Processor Fault) code that would come and go. The owner had already replaced the spark plugs, ignition coils, and even the fuel pump based on other shops’ advice. After confirming power and grounds to the ECM were solid, we knew the internal processor was failing. We sourced a used module with the same service number, programmed it to the vehicle’s VIN, performed the security and crankshaft position relearns, and the Equinox ran perfectly. It saved the customer over a thousand dollars compared to a new module from the dealer.
Why Choose Our Programmed GM ECM 12669908?
This module is the brain of your engine, controlling everything from fuel injection and ignition timing to emissions systems and transmission communication. A failing unit can disrupt the entire vehicle. Our service provides a direct-fit replacement for service number 12669908, ensuring compatibility and restoring proper function. This unit is meticulously sourced from salvaged vehicles and verified for functionality before being prepared for your specific application.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) with communication-related or internal processor fault codes.
- ✔ Engine stalling, stumbling, or hesitating unexpectedly.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Vehicle cranks but refuses to start (no-start condition).
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Performance issues that aren’t resolved by replacing sensors or other components.
Important Installation Information
Please be aware that while we handle the primary programming to your VIN, installation is not always a simple plug-and-play process. Due to factory anti-theft systems, you or your mechanic will need to perform a Vehicle Theft Deterrent (VTD) relearn procedure after the module is installed. This procedure pairs the new ECM to your vehicle’s security system. Without it, the vehicle will not start. Additionally, other system-specific relearns, such as a crankshaft position variation relearn or injector flow rate programming, may be necessary depending on your exact model. These procedures require a compatible high-level scan tool or access to GM’s TIS2Web service. This is the responsibility of the installer.
Frequently Asked Questions
How do I provide my vehicle’s VIN?
After you complete your purchase, you can add your 17-digit VIN to the order notes or send it to us in a message. We cannot program and ship the module without your VIN.
Is this ECM truly plug-and-play?
It is pre-programmed, which handles the most complex part. However, you MUST perform the security relearn procedure after installation for the vehicle to start. Other minor relearns may also be required.
What tools are needed for the security relearn?
A professional-grade, bidirectional scan tool with GM software (like a Snap-on, Autel, or GM’s own MDI/GDS2) or access to the GM TIS2Web online service is required to perform the necessary security and system relearns.
Since this is a used part, is it reliable?
Yes. This is a genuine OEM part, not a low-quality aftermarket copy. Each unit is sourced from a functioning, salvaged vehicle and inspected before being programmed. This offers OEM reliability at a fraction of the cost of a new part.
How do I know if this part will fit my vehicle?
This module fits a wide range of GM vehicles. The most important step is to confirm that the service number (serv.no) on your original ECM is 12669908. If the number matches, this part is the correct replacement for you.