Is Your GM Vehicle Experiencing Critical Failures?
If your 2018-2019 Corvette, Silverado, or Sierra is suddenly plagued by a check engine light, erratic engine behavior, stalling, or a complete no-start condition, the Engine Control Module (ECM) is a primary suspect. As the central computer for your engine, a failing ECM can cause a cascade of frustrating and hard-to-diagnose problems. In my 20+ years in the shop, I’ve seen faulty ECMs mimic everything from bad fuel pumps to failed sensors, making accurate diagnosis key.
The Direct-Fit Solution: Pre-Programmed for Your Vehicle
This is a genuine GM Engine Control Module, service number 12704475, which is the direct replacement for part numbers 12692069, 12680656, 12686383, and 12688528. We take the guesswork and dealer hassle out of the equation by programming the module specifically for your vehicle using your VIN before it ships. This ensures it has the latest, most stable software from General Motors, tailored to your exact configuration.
- โ VIN-Programmed Service: We flash the module with the correct GM calibration for your vehicle. Just provide your VIN at checkout.
- โ Restores Performance: Solves common failure symptoms like harsh shifting, poor fuel economy, and persistent diagnostic trouble codes (DTCs).
- โ Broad Compatibility: A single, reliable solution for a wide range of popular GM trucks, vans, and performance cars.
- โ Latest Software: Loaded with the newest updates from GM to address known bugs and improve engine operation.
Expert Pro Tip: Check for External Faults First
Before you condemn your old ECM, it’s crucial to ensure an external component didn’t cause its failure. I’ve seen countless cases where a shorted ignition coil or a faulty fuel injector driver sends a voltage spike back to the ECM, damaging the internal circuits. Replacing the ECM without fixing the root cause will only lead to the new module failing prematurely. A quick check of the resistance on your coils and injectors can save you from a repeat repair.
Important Note on Post-Installation Procedures
As with any modern vehicle computer replacement, some final setup steps are required after installation. This is standard procedure and is the responsibility of the installer. If the vehicle does not start, a Vehicle Theft Deterrent System Relearn must be performed using a professional tool with access to GM’s TIS2Web or Techline Connect system. Additionally, other procedures like a Crankshaft Variation Relearn or Injector Flow Rate programming may be necessary depending on your specific vehicle and the work being performed. This ensures all vehicle systems communicate correctly with the new ECM.
Confirming Fitment for Your 2018-2019 Corvette ECM and More
This module is engineered to fit a variety of GM vehicles. Please verify your model and options below to ensure compatibility. The location of the ECM can vary, from the right-hand side of the cowl under the dash in a Corvette to the left-hand front of the engine compartment in a Silverado or Tahoe.
- Cadillac Escalade / ESV (2018)
- Cadillac XTS (2018) – 3.6L (VIN 8, opt LF3)
- Chevrolet Corvette (2018-2019) – Fits LT1 (VIN 7) & LT4 (VIN 6) engines
- Chevrolet Express 2500 / 3500 Van (2018) – 4.3L Engine
- Chevrolet Silverado 1500 (2018)
- Chevrolet Suburban 1500 (2018)
- Chevrolet Tahoe (2018)
- GMC Savana 2500 / 3500 Van (2018) – 4.3L Engine
- GMC Sierra 1500 / Denali 1500 (2018)
- GMC Yukon / Yukon XL 1500 (2018)
Straightforward Installation Guide
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the ECM: Find the old module. On a 2018-2019 Corvette, it’s typically under the dash on the passenger side. On trucks, it’s often in the engine bay on the driver’s side.
- Disconnect Connectors: Carefully release the locking tabs and unplug all electrical harnesses from the old ECM. Inspect the connectors for any signs of corrosion or damage and clean them if necessary.
- Remove Old Module: Unbolt the mounting hardware and remove the original ECM from the vehicle.
- Install New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Everything: Plug the electrical harnesses firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Relearns: Proceed with the necessary key/theft relearn and any other required setup procedures for your vehicle.