Restore Peak Performance to Your GM Vehicle
Is your 2018-2019 Corvette, Silverado, Sierra, or other GM vehicle suffering from perplexing issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? These are classic signs of a failing Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, and when it malfunctions, it can cause a cascade of problems that are frustrating and difficult to diagnose. This pre-programmed GM Engine Control Module is the definitive solution to get your vehicle running reliably again.
We take the guesswork and high dealership costs out of the equation. Simply provide your vehicle’s 17-digit VIN during checkout, and our technicians will flash this module with the latest, most stable software updates directly from General Motors. This ensures perfect compatibility and optimal performance for your specific vehicle, right out of the box. This module is a direct replacement for multiple part numbers, including 12704475, 12692069, 12680656, 12686383, and 12688528.
From the Diagnostic Bay
We had a 2018 Silverado 1500 in the shop that was driving the owner crazy. It would randomly stall at red lights and sometimes refuse to start for hours. There were no consistent trouble codes, just a U0100 ‘Lost Communication with ECM’ code that would pop up intermittently. We checked wiring, grounds, and power feeds for days. On a hunch, we connected a scope to the CAN bus lines at the ECM connector. We saw the data signal just drop out completely when we wiggled the main connector. The internal board of the original ECM had a micro-fracture. Swapping in a pre-programmed module like this one, followed by a quick security relearn, had the truck running perfectly. It’s a reminder that sometimes the ‘brain’ itself is the source of the ghost in the machine.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) with various engine-related codes.
- ✔ Vehicle refuses to start or has intermittent starting issues.
- ✔ Rough or unstable engine idle.
- ✔ Noticeable decrease in fuel economy.
- ✔ Engine stalling or hesitating during acceleration.
- ✔ Transmission shifting problems or harsh shifts.
- ✔ Inability for scan tools to communicate with the module.
Installing Your New GM Engine Control Module
While this module comes programmed for your vehicle’s engine and emissions calibrations, it is not a simple ‘plug-and-play’ installation. Due to the sophisticated anti-theft systems in modern GM vehicles, a Vehicle Theft Deterrent (VTD) relearn procedure is mandatory after installation. If this step is not performed, your vehicle will not start as a security precaution.
This relearn procedure requires access to GM’s professional programming software, such as Tis2web or Techline Connect. We strongly recommend that the installation and relearn procedure be performed by a qualified automotive technician or a shop with the appropriate diagnostic equipment. Additional procedures, such as a crankshaft position variation relearn or injector flow rate programming, may also be necessary depending on your specific vehicle and its condition. It is the buyer’s responsibility to ensure these final setup procedures are completed correctly.
Frequently Asked Questions
Do I need to have this ECM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it to you. This handles the main software calibration, saving you a trip to the dealership for that specific task.
What is a Vehicle Theft Deterrent (VTD) relearn?
It’s a security procedure that syncs the new ECM to your vehicle’s ignition keys and Body Control Module (BCM). This ensures the vehicle recognizes the new module and allows the engine to start. It is a required step.
Can I perform the theft relearn myself?
This procedure requires specialized GM-specific tools and software (like Techline Connect). It is not possible to do with standard OBD-II scanners. We highly recommend having a professional auto repair shop perform the installation and final relearn steps.
What information do you need from me?
After you place your order, you must provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program or ship your module without it.
Will this part fit my vehicle?
This ECM fits a wide range of 2018-2019 GM vehicles, including the Corvette, Silverado/Sierra 1500, Tahoe, Suburban, Escalade, and more. It directly replaces part numbers 12704475, 12692069, 12680656, 12686383, and 12688528. Please verify the part number from your original module to ensure compatibility.