Is Your GM Vehicle Plagued by Engine Problems?
If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a no-start condition in your 2018-2019 Corvette, Silverado, or other compatible GM model, a failing Engine Control Module (ECM) is often the culprit. As the central computer for your engine, its proper function is non-negotiable. In my 20+ years in the bay, I’ve seen how a faulty ECM can turn a high-performance machine into a driveway ornament. This isn’t just a part; it’s the command center for your vehicle’s performance and reliability.
The Direct Solution: A VIN-Programmed ECM
This listing is for a genuine GM Engine Control Module, part number 12704475, which also replaces part numbers 12692069, 12680656, 12686383, and 12688528. We take the guesswork out of the repair. Simply provide your vehicle’s 17-digit VIN during checkout, and our technicians will program the module with the latest, most stable software directly from GM. It arrives at your door ready for installation, saving you a trip to the dealership and the high costs associated with their programming services.
Common Symptoms of a Failing ECM:
- โ Persistent Check Engine Light (CEL) with various communication or sensor codes.
- โ Vehicle randomly stalling or refusing to start.
- โ Noticeable decrease in fuel economy and engine performance.
- โ Rough idling or misfires that new spark plugs and coils can’t fix.
- โ Transmission shifting issues or other module communication errors.
Expert Pro Tip: Check for External Faults First
Before you even think about installing a replacement ECM, do this: check your main engine wiring harness for chafing or damage, especially near hot or vibrating components. I had a 2018 Silverado in the shop that had gone through two ECMs. The actual problem was a wire rubbing against a bracket, causing an intermittent short that was frying the computer. A five-minute visual inspection can save you from damaging your new part and repeating the repair.
Installation and Setup Guide for Your 2018-2019 Corvette ECM
Installing your new engine computer is straightforward, but a few post-installation steps are critical for success. Please read these carefully.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate and Replace: Find your old ECM. On a 2018-2019 Corvette, it’s typically located on the right-hand side, under the cowl in the dash area. For trucks and SUVs, it’s usually in the engine bay on the driver’s side. Carefully disconnect the wiring harnesses and remove the mounting bolts. Install the new module in its place and securely reconnect the harnesses.
- Reconnect Battery: Reattach the negative battery terminal.
- CRITICAL: Vehicle Theft Deterrent Relearn: Turn the key to the ‘ON’ position. If the vehicle does not start, it is because the anti-theft system needs to be synchronized with the new ECM. This is a normal security feature. This procedure requires a GM-specific scan tool with access to Tis2web or Techline Connect. This is the responsibility of the installer.
- Additional Relearns: Depending on your specific vehicle, other procedures like a Crankshaft Position Variation Relearn or injector flow rate programming may be necessary to achieve optimal performance. These also require a professional-grade scan tool.
Guaranteed Fitment for a Wide Range of GM Vehicles:
This module is the correct fit for numerous 2018-2019 GM cars, trucks, and SUVs. Please verify your part number or contact us with your VIN to confirm compatibility. Key models include:
- 2018-2019 Chevrolet Corvette (LT1 & LT4)
- 2018 Chevrolet Silverado 1500 / GMC Sierra 1500
- 2018 Cadillac Escalade / Escalade ESV
- 2018 Chevrolet Suburban 1500 / Tahoe
- 2018 GMC Yukon / Yukon XL 1500
- 2018 Chevrolet Express / GMC Savana Vans (4.3L)
- 2018 Cadillac XTS (3.6L)
Restore your vehicle’s brain and get it running the way it was designed to. Order today and let us handle the complex programming for you.