Is Your GM Vehicle Running Rough or Showing a Check Engine Light?
If you’re dealing with frustrating issues like poor engine performance, erratic shifting, a persistent check engine light, or even a no-start condition in your 2018-2019 Corvette or other compatible GM vehicle, a failing Engine Control Module (ECM) is a very likely culprit. As the central computer for your engine, when the ECM falters, it can cause a cascade of problems that are impossible to ignore. In my 20+ years of diagnostics, I’ve seen how a faulty ECM can mimic a dozen other issues, leading to wasted time and money on incorrect repairs.
The Direct Solution: A VIN-Programmed ECM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We are offering a genuine GM Engine Control Module, part number 12704475, which is a direct replacement for several part numbers including 12692069, 12680656, 12686383, and 12688528. The most critical service we provide is programming this module specifically to your vehicle’s 17-digit VIN before it ships. This ensures it has the latest, most stable software from General Motors, tailored perfectly for your car or truck’s specific configuration.
Expert Pro Tip: Check Your Connectors First
Before you condemn your old ECM, take a moment to inspect the electrical connector pins on both the module and the wiring harness. On vehicles like the Corvette where the ECM is in the cowl area, moisture intrusion can cause subtle green or white corrosion on the pins. This creates poor connections and can cause the exact same symptoms as a failed module. Cleaning them with a dedicated contact cleaner can sometimes resolve the issue. If the pins are clean and the problem persists, the module itself is the next logical step.
Why Choose Our Pre-Programmed 2018-2019 Corvette ECM?
Getting your vehicle back to factory-spec performance is our top priority. Hereโs what makes this module the right choice:
- โ VIN-Specific Programming: We flash the module with the latest GM calibrations using your vehicle’s VIN. This ensures compatibility and optimal performance, right out of the box.
- โ Solves Common Problems: Directly addresses issues like false sensor codes (especially U-codes), harsh transmission shifting, poor fuel economy, and intermittent stalling.
- โ Broad GM Compatibility: While perfect for the C7 Corvette, this module also fits a wide range of popular 2018 GM trucks and SUVs, including the Silverado, Sierra, Tahoe, Suburban, and Escalade (see full fitment list below).
- โ Saves Time and Money: Avoid a costly trip to the dealership and the associated programming fees. While some on-vehicle procedures may be needed, the core software work is done for you.
Simple Installation and Required Final Steps
Installing your new ECM is straightforward, but it’s crucial to understand the final steps required to integrate it with your vehicle’s systems. Please read this carefully.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate and Replace: On a 2018-2019 Corvette, the ECM is found under the dash on the right-hand (passenger) side cowl. On trucks and SUVs, it’s typically in the engine bay on the driver’s side. Carefully disconnect the wiring harnesses and remove the old module, then install the new one in its place.
- Reconnect Battery: Once the new module is securely installed and all connectors are plugged in, reconnect the negative battery terminal.
- IMPORTANT – Theft Deterrent Relearn: After installation, your vehicle’s anti-theft system may prevent it from starting. This is normal. A Vehicle Theft Deterrent System Relearn must be performed using a GM-specific scan tool with access to Tis2web or Techline Connect. This procedure syncs the new ECM with your vehicle’s security components.
- Additional Relearns: Depending on your vehicle, other procedures like a Crankshaft Position Variation Relearn or injector flow rate programming may also be necessary. These are standard procedures after an ECM replacement.
NOTICE: The buyer is responsible for performing the Theft Deterrent Relearn and any other necessary setup procedures. We provide a module correctly programmed to your VIN; the final vehicle integration must be completed by the installer.
Guaranteed Fitment For These Vehicles:
This module, part number 12704475, is the correct service replacement for the following vehicles and original part numbers:
- Replaces Part Numbers: 12704475, 12692069, 12680656, 12686383, 12688528
- Cadillac Escalade/ESV (2018)
- Cadillac XTS (2018) – 3.6L Twin Turbo (VIN 8, opt LF3)
- Chevrolet Corvette (2018-2019) – Fits LT1 & LT4 engines
- Chevrolet Express / GMC Savana Vans (2018) – 4.3L Engine
- Chevrolet Silverado 1500 / GMC Sierra 1500 (2018)
- Chevrolet Suburban 1500 / GMC Yukon XL 1500 (2018)
- Chevrolet Tahoe / GMC Yukon (2018)