Restore Peak Performance to Your GM Vehicle
Is your Corvette, Silverado, or Escalade suffering from erratic engine behavior, a persistent check engine light, or a no-start condition? These are classic signs of a failing Engine Control Module (ECM), the electronic brain of your vehicle. A faulty ECM can cripple your vehicle’s performance, fuel economy, and reliability. This genuine GM Engine Control Module, part number 12704475, is the definitive solution to restore your vehicle’s factory-specified operation and get you back on the road with confidence.
Unlike generic modules from a local parts store, this unit is not just a replacement part; it’s a complete, vehicle-specific solution. We professionally program the module to your vehicle’s unique Vehicle Identification Number (VIN) before it ships. This critical step ensures that the ECM has the correct software and calibrations for your specific engine, transmission, and emissions equipment, eliminating compatibility issues and ensuring a smooth installation process.
Expert Pro Tip
Expert Pro Tip
When replacing a modern GM ECM, the programming is only half the battle. After installation, a ‘Vehicle Theft Deterrent Relearn’ is almost always required. This is a security procedure that pairs the new ECM to your vehicle’s ignition key and Body Control Module (BCM). Without it, the vehicle will not start. This procedure must be performed with a professional scan tool that has access to GM’s TIS2Web or Techline Connect software. Plan to have this service performed by a qualified technician or a shop with the appropriate equipment immediately after installation.
Is Your Vehicle Showing Signs of ECM Failure?
A failing engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, it’s time to consider your ECM as the potential culprit:
- ✔ Check Engine Light is on with various, often unrelated, trouble codes.
- ✔ Vehicle refuses to start or cranks but won’t turn over.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Engine stalling, stuttering, or misfiring intermittently.
- ✔ Rough or unpredictable automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Loss of power and poor acceleration.
The Right Solution for Your 2018-2019 Corvette ECM
This module is a direct-fit replacement for a wide range of popular GM trucks, SUVs, and performance cars. By providing us with your VIN, you guarantee that you receive a component loaded with the latest GM-authorized software updates, often correcting factory drivability issues and improving overall performance. This is the most reliable and effective way to resolve complex electronic issues. This unit is a direct replacement for multiple part numbers, including 12704475, 12692069, 12680656, 12686383, and 12688528.
Wide-Ranging GM Fitment:
This ECM is compatible with a variety of 2018-2019 General Motors vehicles. Please verify your part number or consult the fitment list below:
- Corvette (2018-2019): Fits models with LT1 and LT4 engines.
- Silverado 1500 / Sierra 1500 (2018): Fits models with ID 12680656 or 12686383.
- Escalade / Escalade ESV (2018): Direct fit for engine compartment location.
- Tahoe / Suburban 1500 / Yukon / Yukon XL 1500 (2018): Fits models with LH front engine compartment location.
- Express / Savana Vans (2018): Specifically for 2500/3500 models with the 4.3L engine.
- Cadillac XTS (2018): For models with the 3.6L LF3 engine.
Important Installation Note: The buyer is responsible for all post-installation procedures. This includes the mandatory Vehicle Theft Deterrent Relearn, as well as any other specific setups required for your vehicle, such as crankshaft position variation relearn, fuel injector flow rate programming, or idle learn procedures. These are standard industry practices when replacing a modern ECM.
Frequently Asked Questions
Expert Pro Tip
When replacing a modern GM ECM, the programming is only half the battle. After installation, a ‘Vehicle Theft Deterrent Relearn’ is almost always required. This is a security procedure that pairs the new ECM to your vehicle’s ignition key and Body Control Module (BCM). Without it, the vehicle will not start. This procedure must be performed with a professional scan tool that has access to GM’s TIS2Web or Techline Connect software. Plan to have this service performed by a qualified technician or a shop with the appropriate equipment immediately after installation.