Restore Your Vehicle’s Brainpower and Performance
Is your truck, van, or SUV suffering from a persistent check engine light, erratic performance, or a frustrating no-start condition? A failing Engine Control Module (ECM) is often the culprit, acting like a broken command center for your vehicle’s most critical functions. This genuine GM ECM, compatible with part numbers 12704475, 12692069, 12680656, 12686383, and 12688528, is the definitive solution to get you back on the road with confidence. We take the guesswork out of the repair by professionally programming the module to your specific Vehicle Identification Number (VIN) with the latest GM software updates before it ever leaves our facility.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty ECM is the likely cause. Installing our pre-flashed module is the most reliable way to correct these problems:
- Check Engine Light (CEL) that won’t go away
- Vehicle refuses to start or cranks without firing
- Poor fuel economy and reduced engine power
- Erratic shifting or transmission issues
- Communication error codes with diagnostic scanners
By providing your VIN upon purchase, you receive a programmed 12704475 ECM that is calibrated specifically for your vehicle’s factory settings, ensuring a seamless and effective repair.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with your vehicle’s exact VIN, ensuring all systems communicate correctly right from the start.
- ✔ Latest GM Software: Your ECM arrives with the most current factory calibrations, often improving performance, fuel efficiency, and emissions over the original unit.
- ✔ Direct-Fit Replacement: Engineered to be a perfect match for the original, this module fits a wide range of GM vehicles without any need for modification.
- ✔ Cost-Effective Solution: Avoid the high costs and scheduling delays of a dealership visit. We provide a dealership-level service directly to you.
- ✔ Purchase Protection: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Programming
Many people are tempted to buy a used ECM from a salvage yard, thinking it’s a cheaper fix. However, an ECM is not a simple mechanical part; it’s a computer coded to a specific vehicle. A used module will have the wrong VIN, immobilizer data, and option content, leading to a no-start condition or a cascade of error codes. Our service eliminates that risk. By purchasing a professionally programmed 12704475 ECM from us, you’re not just buying a part—you’re buying the assurance that it will function correctly with your vehicle’s complex electronic systems.
Frequently Asked Questions
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) is essential for us to load the correct, vehicle-specific software and calibrations from GM. This step ensures the ECM works perfectly with your engine, transmission, and other onboard systems, just as it would from the factory.
What is a “theft relearn” and will I need to do one?
A theft relearn procedure syncs the new ECM with your vehicle’s anti-theft system and keys. In many cases, this is a necessary final step for the vehicle to start. This procedure requires a GM-compatible scan tool and access to their programming system (Tis2web/Techline Connect) and is the responsibility of the installer.
Is this a simple plug-and-play part?
While our pre-programming handles the most complex part of the installation, some vehicles may require additional procedures after the ECM is installed. This can include the theft deterrent relearn, a crankshaft position sensor relearn, or injector flow rate programming. These are standard procedures for this type of repair.
What symptoms indicate a bad ECM?
Common signs include a persistent check engine light, engine stalling or misfiring, a complete no-start condition, poor fuel mileage, and communication errors when using a scan tool. This professionally programmed 12704475 ECM is designed to resolve these specific issues.
Is this part covered by a warranty?
Yes, absolutely. This unit is backed by our one-year replacement warranty, giving you peace of mind with your purchase.