Restore Your GM’s Performance and Reliability
Is your Corvette, Silverado, or Escalade suffering from baffling electrical issues, a persistent check engine light, or a no-start condition? A failing Engine Control Module (ECM) is often the culprit, acting like a broken brain for your vehicle. This isn’t just an inconvenience; it’s a critical failure that can leave you stranded. We provide the definitive solution: a genuine GM Engine Control Module, part number 12704475, delivered to your door fully programmed to your vehicle’s unique VIN. This eliminates the guesswork and the need for expensive dealership programming, getting you back on the road faster.
Common Symptoms & Your Solution
A failing ECM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, this module is the likely solution:
- Complete No-Start Condition: The engine cranks but will not fire up.
- Erratic Engine Behavior: Stalling, hesitation, rough idling, or poor fuel economy.
- Persistent Check Engine Light (CEL): Especially with codes like P0601, P0606, or other internal processor faults.
- Communication Errors: Your scan tool cannot communicate with the engine computer.
- Transmission & Shifting Problems: The ECM plays a key role in communicating with the transmission controller, and a failure can cause harsh or incorrect shifting.
Our programmed 12704475 ECM is the direct answer to these issues, restoring the precise control and communication your vehicle’s complex systems require.
Features & Benefits
- ✔️ VIN-Programmed for Your Vehicle: We flash this module with the latest GM software using your specific VIN, ensuring 100% compatibility and proper function right out of the box.
- ✔️ Direct Replacement Solution: Engineered to replace multiple GM part numbers including 12704475, 12692069, 12680656, 12686383, and 12688528 for a perfect fit.
- ✔️ Solves Critical Failures: Eliminates frustrating issues like no-start conditions, communication errors, and persistent check engine lights caused by a faulty original ECM.
- ✔️ Restores Peak Performance: Get your engine’s power, fuel efficiency, and smooth operation back to factory specifications.
- ✔️ This unit is backed by our one-year replacement warranty.
Expert Insight: Understanding the Theft Relearn Process
After installing your new programmed 12704475 ECM, a ‘theft deterrent relearn’ is often necessary. This is not a defect; it’s a critical security feature designed by GM to prevent theft. The new ECM needs to be securely ‘handshaken’ with your vehicle’s ignition and security system. This procedure requires a professional-grade GM diagnostic tool (like Tis2web/Techline Connect). While we handle the complex VIN programming, this final security sync is the responsibility of the installer. It’s the same final step a dealership technician would perform, ensuring your vehicle is both operational and secure.
Frequently Asked Questions
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot program and ship your module without it, so please provide it promptly to avoid delays.
What is a ‘theft relearn’ and is it always required?
A theft relearn syncs the new ECM with your vehicle’s anti-theft system. On most modern GM vehicles, this is a mandatory step for the vehicle to start after installation. It requires a specific GM-compatible diagnostic system and is the responsibility of the installer.
Will this part require any other programming?
While we handle the main engine calibration programming, certain vehicles may require additional setup procedures after installation, such as a crankshaft variation relearn or injector flow rate programming. These are standard procedures for a professional technician.
Is this a simple plug-and-play installation?
The module itself is a direct plug-in replacement. However, due to the mandatory post-installation procedures like the theft relearn, it is not considered a simple ‘plug-and-play’ repair. Professional installation is highly recommended to ensure all steps are completed correctly.
Which vehicles does this programmed 12704475 ECM fit?
This module fits a wide range of 2018-2019 GM vehicles, including the Corvette, Silverado 1500, Sierra 1500, Tahoe, Suburban, Escalade, and various Express/Savana vans. Please verify your part number and check the detailed fitment list on this page to ensure compatibility.