Restore Your Vehicle’s Brainpower and Performance
A failing Engine Control Module (ECM) can bring your GM vehicle to a standstill, causing a cascade of frustrating issues from a persistent check engine light and poor fuel economy to stalling or a complete no-start condition. Stop the guesswork and get back on the road with confidence. This is a direct-fit replacement Engine Control Module, professionally programmed with the latest GM software updates specifically for your vehicle’s VIN. It’s the definitive solution to restore the precise, factory-spec performance you expect from your car, truck, or SUV.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty ECM is the likely culprit. This unit is designed to resolve these exact problems:
- Persistent Check Engine Light (CEL) with various Diagnostic Trouble Codes (DTCs)
- Engine stalling, misfiring, or running rough
- Noticeable decrease in fuel efficiency
- Transmission shifting problems or harsh shifts
- Communication errors with other vehicle modules (U-codes)
- Vehicle failing to start or starting intermittently
By installing our Programmed GM ECM 12704475, you are not just replacing a part; you are restoring the central command center of your vehicle’s powertrain, ensuring all components work in harmony as the manufacturer intended.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with your vehicle’s unique VIN, ensuring 100% compatibility with its specific options and systems.
- ✔ Latest GM Updates: Your new ECM arrives with the most current factory software, often improving on the original performance and correcting known issues.
- ✔ Direct-Fit Replacement: This unit is a direct replacement for multiple part numbers, including 12704475, 12692069, 12680656, 12686383, and 12688528.
- ✔ Cost-Effective Repair: Avoid the high costs and scheduling delays of a dealership visit. We provide a dealership-quality programmed module directly to you or your mechanic.
- ✔ Restored Performance: Re-establish correct fuel mixture, ignition timing, and transmission control for a smoother, more efficient, and more reliable driving experience.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
As a 20-year veteran technician, I’ve seen countless vehicle issues caused by improperly matched electronics. Simply installing a used ECM from a salvage yard is a huge gamble. It might have come from a vehicle with different options, a different transmission, or different emissions equipment. This mismatch can lead to a no-start condition at best, and at worst, potential damage to other components. Our process of programming the Programmed GM ECM 12704475 to your specific VIN eliminates that risk entirely. We ensure the digital ‘DNA’ of the computer is a perfect match for your vehicle, laying the foundation for a successful and lasting repair.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your ECM without it. Please double-check the VIN for accuracy before sending.
What is a ‘theft relearn’ and will I need to do it?
For security, most modern GM vehicles have a Vehicle Theft Deterrent (VTD) system that links the ECM to your specific key and ignition. After installing the new ECM, if the vehicle does not start, this security system needs to be reset. This ‘theft relearn’ procedure requires a professional scan tool with access to GM’s TIS2Web or Techline Connect software. This is a standard procedure for any professional shop.
Are there any other procedures needed after installation?
Yes, depending on your vehicle, other relearns or setup procedures may be necessary. These can include a crankshaft position sensor variation relearn, injector flow rate programming, or other setups. These are the responsibility of the installer and are critical for optimal engine performance after ECM replacement.
Is this a plug-and-play part?
While the physical installation is straightforward and the programming is done for you, it is not always ‘plug-and-play’ due to the potential need for the security relearn and other setup procedures mentioned above. We handle the most complex part—the programming—but final integration must be completed on the vehicle by the installer.
How do I know if this ECM fits my vehicle?
This ECM fits a wide range of 2018-2019 GM models. Please check the fitment list on this page and ensure one of the compatible part numbers (12704475, 12692069, 12680656, 12686383, 12688528) matches your original unit. Providing your VIN for programming is the final step to guarantee a perfect match.