Restore Peak Performance to Your GM Vehicle
Is your 2018-2019 Corvette, Silverado, or Sierra suffering from perplexing engine issues? Unexplained check engine lights, poor fuel economy, stalling, or a complete no-start condition can often be traced back to a failing Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, responsible for managing everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it fails, the entire system can be compromised, leaving you stranded and facing a costly trip to the dealership.
This is a direct-fit replacement Engine Control Module, part number 12704475, which also supersedes part numbers 12692069, 12680656, 12686383, and 12688528. We take the guesswork and complexity out of the replacement process. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program the module with the latest GM-certified software specific to your vehicle. This ensures seamless integration and optimal performance right out of the box, saving you from expensive programming fees and the need for specialized tools.
Common Symptoms of a Failing ECM
A faulty ECM can manifest in various ways, often mimicking other component failures. If you’re experiencing any of the following, your engine computer may be the culprit:
- ✔ Check Engine Light is illuminated with communication-related trouble codes (U-codes).
- ✔ Engine misfires, runs rough, or stalls intermittently.
- ✔ The vehicle cranks but refuses to start.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ Loss of power and sluggish acceleration.
- ✔ Communication issues with diagnostic scan tools.
Expert Pro Tip
Expert Pro Tip
After installing your new ECM, a ‘Vehicle Theft Deterrent System Relearn’ is often necessary. This is a security procedure that syncs the new module with your vehicle’s keys and anti-theft system. While we handle the main programming, this final handshake must be done on the vehicle. A professional shop with access to GM’s TIS2Web or Techline Connect software can perform this procedure in minutes. Don’t be alarmed if the vehicle doesn’t start immediately; this is a normal part of the process.
Why Choose a Pre-Programmed 2018-2019 Corvette ECM?
Purchasing a pre-programmed ECM is the most efficient and reliable way to get your vehicle back on the road. An unprogrammed module from a dealer or an old unit from a salvage yard will not work without being flashed to your specific VIN. Our service eliminates this critical, and often difficult, step. We load the correct calibrations and software updates from GM, ensuring your engine operates exactly as the manufacturer intended. This process corrects factory bugs, improves efficiency, and guarantees compatibility with your vehicle’s existing systems.
Installation and Post-Installation Procedures
Physical installation is typically straightforward. The ECM is usually located in the engine bay or, on some models like the Corvette, under the cowl on the passenger side. Disconnect the battery, carefully unplug the wiring harnesses from the old module, unbolt it, and install the new one in its place. Reconnect the harnesses and the battery.
IMPORTANT: As noted, the vehicle may not start until a security relearn is completed. Additionally, other procedures may be required depending on your specific vehicle, such as:
- Crankshaft Variation Relearn: To ensure accurate misfire detection.
- Injector Flow Rate Programming: To match the new ECM to your existing fuel injectors.
- Other System Setups: Depending on vehicle options.
These are standard procedures for ECM replacement and are the responsibility of the installer. We provide a module correctly programmed for your VIN; the final vehicle-side relearns must be performed by a qualified technician.
Guaranteed Fitment for a Wide Range of GM Models
While this is a popular 2018-2019 Corvette ECM, this versatile module fits a wide array of GM trucks, vans, and sedans. Please verify your part number and check the compatibility list below to ensure a perfect match for your vehicle.
- CORVETTE 18-19: Electronic Control Module; (RH cowl under dash)
- SILVERADO 1500 PICKUP 18: Electronic Control Module; (LH front engine compartment)
- SIERRA 1500 PICKUP 18: Electronic Control Module; (LH front engine compartment)
- ESCALADE / ESCALADE ESV 18: Electronic Control Module; (engine compartment)
- EXPRESS / SAVANA VANS 18 (2500/3500): Electronic Control Module; (LH rear engine compartment), 4.3L
- SUBURBAN 1500 18: Electronic Control Module; (LH front engine compartment)
- TAHOE 18: Electronic Control Module; (LH front engine compartment)
- SIERRA DENALI 1500 18: Electronic Control Module; (LH front engine compartment)
- YUKON / YUKON XL 1500 18: Electronic Control Module; (LH front engine compartment)
- XTS 18: Electronic Control Module; (3.6L)
Frequently Asked Questions
Expert Pro Tip
After installing your new ECM, a ‘Vehicle Theft Deterrent System Relearn’ is often necessary. This is a security procedure that syncs the new module with your vehicle’s keys and anti-theft system. While we handle the main programming, this final handshake must be done on the vehicle. A professional shop with access to GM’s TIS2Web or Techline Connect software can perform this procedure in minutes. Don’t be alarmed if the vehicle doesn’t start immediately; this is a normal part of the process.