Is Your Corvette Suffering from Frustrating Engine Problems?
A failing Engine Control Module (ECM) in a high-performance vehicle like a 2017 Corvette can be a source of constant headaches. You might be experiencing erratic engine behavior, a persistent check engine light that won’t go away, poor fuel economy, or even a dreaded no-start condition that leaves you stranded. As a technician with over two decades of experience, I’ve seen how a faulty ECM can mimic a dozen other problems, leading to wasted time and money on unnecessary parts. This isn’t just an inconvenience; it robs you of the driving experience you expect from your Corvette.
The Direct Solution: A VIN-Programmed Replacement
This Engine Control Module, part number 12678815, is the definitive solution to get your vehicle running correctly again. We take the guesswork out of the repair. Before we ship the part, we use your vehicle’s unique Vehicle Identification Number (VIN) to program the module with the latest, most stable software updates directly from GM. This ensures that the computer is a perfect match for your vehicle’s specific configuration, restoring factory performance and communication between all onboard systems.
Expert Pro Tip: Check Your Connectors First
Before you condemn your old ECM, take a moment to inspect the electrical connectors that plug into it. Over the years, I’ve seen countless cases where corrosion or a single bent pin was the real source of the problem. Unplug the harnesses (with the battery disconnected!) and look for any green or white crusty buildup or damaged pins. Cleaning them with a dedicated electronics cleaner and a small brush can sometimes save you the cost of a new part. It’s a 5-minute check that has saved my customers hundreds of dollars.
Symptoms of a Failing 2017 Corvette Engine Control Module
If your vehicle is exhibiting any of the following symptoms, a faulty ECM is a likely culprit:
- โ Check Engine Light is on with various communication or sensor codes.
- โ Engine cranks but refuses to start.
- โ Noticeable loss of power and poor acceleration.
- โ Random engine stalling or stumbling, especially at idle.
- โ Decreased fuel efficiency for no apparent reason.
- โ Transmission shifting issues or other modules reporting communication loss with the ECM.
Installation and Post-Installation Requirements
Installing your new ECM is straightforward, but it’s critical to follow the correct procedures to ensure a successful repair. For the 2017 Corvette, the ECM is located under the dash on the right-hand (passenger) side cowl area.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes before beginning work.
- Locate the Module: Access the ECM, which is typically secured by several bolts or nuts in the passenger-side cowl area.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Depress the locking tabs fully to avoid damaging them. Once disconnected, remove the fasteners and take out the old module.
- Install the New Module: Seat the new, pre-programmed ECM in place and secure it with the original fasteners. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect Battery: Reattach the negative battery terminal.
IMPORTANT: Post-Installation Procedures
After installation, some vehicles may start and run perfectly. However, many modern GM vehicles require additional steps. If your vehicle does not start, a Vehicle Theft Deterrent System (VTDS) relearn is required. This procedure syncs the new ECM with your vehicle’s anti-theft system and must be performed using a professional scan tool with access to GM’s Tis2web or Techline Connect software. This is not something that can be bypassed. Additionally, other procedures like a Crankshaft Position Variation Relearn or injector flow rate programming may be necessary depending on your specific vehicle and circumstances. The responsibility for performing these relearn procedures lies with the installer.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and part numbers. Please verify your part number or vehicle in the list below.
Replaces Part Numbers: 12692068, 12704476, 12686382, 12674052, 12674472, 12678815
Fitment Includes:
- 2017 Cadillac Escalade / Escalade ESV
- 2017 Cadillac XTS (3.6L Twin Turbo LF3)
- 2017 Cadillac CTS (6.2L Supercharged / 3.6L Twin Turbo LF3)
- 2017 Cadillac ATS (3.6L LF4)
- 2017 Chevrolet Corvette
- 2017 Chevrolet Tahoe / Suburban 1500
- 2017-2018 Chevrolet Silverado 1500
- 2017 GMC Yukon / Yukon XL 1500
- 2017-2018 GMC Sierra 1500 / Sierra Denali 1500
- 2016 Chevrolet Silverado 1500 / GMC Sierra 1500 (ID 12674472)