Is your GM vehicle plagued by erratic behavior, no-start conditions, or a persistent Check Engine light? A failing Engine Control Module (ECM) is often the culprit, leaving you stranded and frustrated. This professionally programmed 12704475 ECM is the definitive solution to restore your vehicle’s performance and reliability, flashed specifically to your vehicle’s VIN before it ships.
Common Symptoms & Your Solution
A faulty engine computer can manifest in numerous ways that are often difficult to diagnose. If your truck, van, or SUV is experiencing any of the following, a failing ECM is a likely cause:
- Persistent Check Engine Light (CEL)
- Engine stalling or misfiring unexpectedly
- Noticeable drop in fuel economy
- Harsh or incorrect automatic transmission shifting
- Communication errors with diagnostic scan tools
- Vehicle refuses to start, even with a good battery and starter
Instead of guessing with a used part from a salvage yard that could create more problems, this professionally programmed module is the direct and reliable fix. By matching the software to your VIN, we ensure the brain of your engine operates exactly as the manufacturer intended.
Features & Benefits
- ✔ VIN-Specific Programming: We flash this module with the latest GM-authorized software calibrations using your vehicle’s unique VIN. This is not a generic tune; it’s a precise setup for your specific vehicle, ensuring perfect communication between all onboard systems.
- ✔ Direct-Fit Replacement: This module is a direct replacement for original part numbers 12704475, 12692069, 12680656, 12686383, and 12688528, guaranteeing a perfect physical fit.
- ✔ Restored Drivability: Solves common issues like stalling, poor idle, and shifting problems by restoring the core logic that controls engine and transmission functions.
- ✔ No Guesswork: Arrives ready for installation. While some post-install procedures may be required, the critical and complex software flashing is handled by our experts before shipment.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
As a technician, I’ve seen countless vehicle owners waste time and money installing a used ECM from a junkyard. They think they’re saving a few dollars, but they’re buying a computer that’s programmed for a completely different vehicle. An ECM from a Silverado with a 5.3L engine has different fuel maps, transmission shift points, and emissions parameters than one for a Savana van with a 4.3L, even if the box looks identical. Installing the wrong one can lead to poor performance, new error codes, or even a no-start condition. That’s why a properly programmed 12704475 ECM, flashed specifically to your VIN, isn’t just a part—it’s a comprehensive solution that ensures your vehicle runs exactly as it did from the factory.
This is the most reliable way to get your vehicle back on the road or back to work. Our expert service for the programmed 12704475 ECM ensures you receive a component that is ready to be integrated into your vehicle’s complex electronic system.
Frequently Asked Questions
How do I provide my vehicle’s VIN?
After you complete your purchase, you can add your 17-digit Vehicle Identification Number (VIN) to the order notes or reply to your order confirmation email. We must have your VIN to program the module before we can ship it.
Is this a simple plug-and-play installation?
For many vehicles, it is. However, due to GM’s anti-theft systems, the vehicle may not start after installation until a ‘theft relearn’ procedure is completed. This syncs the new ECM to your vehicle’s security system.
What is a ‘theft relearn’ and will I need a mechanic to do it?
A theft relearn (or security relearn) is a procedure that requires a professional scan tool with access to GM’s programming system (Tis2web/Techline Connect). This is the responsibility of the installer. We recommend having a qualified mechanic available to perform this step if the vehicle does not start immediately after installation.
Will this ECM require any other programming?
The core engine and transmission software is fully programmed by us. However, depending on your vehicle, your mechanic may need to perform additional minor relearn procedures after installation, such as for the crankshaft position sensor or fuel injectors. This is standard practice when replacing an ECM.
Which part numbers does this module replace?
This ECM is a direct, pre-programmed replacement for the following GM part numbers: 12704475, 12692069, 12680656, 12686383, and 12688528.