Restore Your Corvette’s Brain and Reclaim Its Power
As a technician with over two decades of experience under the hood, I know the frustration that comes with a high-performance vehicle like a 2017 Corvette that suddenly won’t start, runs rough, or throws a cascade of baffling check engine lights. More often than not, the culprit is the very heart of the vehicle’s electronic system: the Engine Control Module (ECM). This isn’t just another part; it’s the central command center, and when it fails, your car is dead in the water. This replacement Engine Control Module, part number 12674052, is the definitive solution to get your vehicle operating at factory-spec performance again.
The Smart Solution: Pre-Programmed for You
The biggest hurdle in replacing a modern ECM is programming. In the past, this meant towing your vehicle to a dealership, paying their high labor rates, and waiting. We eliminate that entire step. When you purchase this module, we use the Vehicle Identification Number (VIN) you provide to flash it with the latest, most stable GM factory software specifically for your vehicle. This ensures all engine and transmission parameters are correct right out of the box. You receive a module that is ready for installation, saving you significant time and money.
From the Diagnostic Bay: The Phantom No-Start
I once had a 2017 Sierra with the same family of ECM come into my shop. The owner was at his wit’s end. The truck would start fine for a week, then refuse to crank for two days, with no rhyme or reason. He’d already replaced the battery and starter. We scanned it and found intermittent U0100 (Lost Communication with ECM) codes. After checking all the wiring, grounds, and power feeds to the ECM, we found no faults. On a hunch, we connected a scope and saw the 5-volt reference signal from the ECM intermittently dropping out. It was an internal failure that only occurred under specific temperature conditions. A new, properly programmed 2017 Corvette Engine Module (which also fits his truck) solved the problem permanently. These phantom issues are a classic sign of a failing computer.
Is Your Vehicle’s ECM Failing? Check These Signs
A failing ECM can manifest in numerous ways, from subtle to severe. If you’re experiencing any of the following, a faulty module is a likely cause:
- ✔ Vehicle will not start or has a ‘crank, no-start’ condition.
- ✔ Check Engine Light is illuminated with communication-related Diagnostic Trouble Codes (DTCs) like U0100.
- ✔ Internal processor failure codes are present, such as P0601, P0606, or P062F.
- ✔ Poor or erratic engine performance, including misfires, stalling, or hesitation.
- ✔ Unexplained loss of fuel economy or shifting problems.
- ✔ Inconsistent operation of electronic components managed by the ECM.
A Technician’s Guide to ECM Installation
Installing your new 2017 Corvette Engine Module is a straightforward process. While the location varies by model, the general steps are consistent. For the 2017 Corvette, you’ll find it on the passenger’s side, under the cowl panel near the dash.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: Find the existing ECM. On a Corvette, this involves removing the cowl panel for access. On trucks and SUVs, it’s typically in the engine bay on the driver’s side.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that must be released. Once disconnected, unbolt the module from its mounting bracket and remove it.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Relearn Procedures: This is a critical final step. You will need access to a GM diagnostic tool (like TIS2Web or Techline Connect) to perform the Vehicle Theft Deterrent System relearn. Without this, the vehicle will not start. Other procedures, like a Crankshaft Variation Relearn, may also be necessary for optimal performance. This is the responsibility of the installer.
Verified Fitment For These GM Vehicles
This ECM is a direct replacement for part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It is compatible with a wide range of GM cars, trucks, and SUVs. Please verify your model and options below:
- Cadillac ATS (2017): 3.6L, VIN Y (LF4)
- Cadillac CTS (2017): 6.2L (Supercharged) or 3.6L, VIN 8 (LF3, Twin Turbo)
- Cadillac Escalade / ESV (2017)
- Cadillac XTS (2017): 3.6L, VIN 8 (LF3)
- Chevrolet Corvette (2017)
- Chevrolet Silverado 1500 (2016-2018)
- Chevrolet Suburban 1500 (2017)
- Chevrolet Tahoe (2017)
- GMC Sierra 1500 / Denali 1500 (2016-2018)
- GMC Yukon / Yukon XL 1500 (2017)
Frequently Asked Questions
Frequently Asked Questions
Do I need to send my old ECM to you?
No, there is no core charge or need to send in your original module. This is a direct replacement part that we program and ship to you.
What information do you need from me?
After your purchase, we require your vehicle’s 17-digit VIN to program the module with the correct GM factory software and calibrations for your specific car or truck.
What is a ‘theft relearn’ and why is it necessary?
The theft deterrent relearn procedure syncs the new ECM with your vehicle’s ignition keys and security system. Without this step, the system will assume a theft is in progress and will disable the engine. This security procedure requires a GM-compatible scan tool.
Will this fix my specific problem?
This module will correct issues directly caused by a failing ECM, such as internal processor faults (P0601) or communication errors (U0100). It’s crucial to ensure your vehicle has been properly diagnosed, as other issues (like bad wiring or sensors) can mimic ECM failure.
Is this a genuine GM part?
This is a high-quality replacement ECM loaded with official GM software. It is guaranteed to function according to OEM specifications and is a reliable alternative to a costly dealership part.