2009 Corvette Engine Control Module 12678512 Programmed to Your VIN

Is Your Corvette Running Rough? The Engine’s Brain Might Be the Problem.

As a technician with over two decades under the hood, I’ve seen my share of high-performance machines come into the bay with baffling issues. A 2009 Corvette ZR1, in particular, is a precision instrument. When it starts acting up—hesitating, throwing random check engine lights, or refusing to start altogether—it’s incredibly frustrating for the owner. Often, the culprit is the one component orchestrating the entire powertrain symphony: the Engine Control Module (ECM).

A failing ECM can manifest in ways that mimic other problems, leading to wasted time and money on parts you don’t need. I remember a customer’s ’09 ZR1 came in with intermittent stalling and communication codes. The initial thought was a wiring issue, but after hours of tracing harnesses, we found the ECM itself was failing internally, causing the data bus to crash. Replacing it with a properly programmed unit solved everything instantly.

Common Symptoms of a Failing GM ECM:

• ✔ Check Engine Light (CEL) is on with various communication or sensor codes.
• ✔ Engine cranks but refuses to start.
• ✔ Unexplained stalling or rough idling.
• ✔ Noticeable decrease in fuel economy and performance.
• ✔ Automatic transmission shifting erratically.
• ✔ The vehicle’s anti-theft or security light stays illuminated.

The Direct Solution: A Pre-Programmed 2009 Corvette Engine Control Module

Forget the dealership hassle and high labor costs for programming. This ECM, part number 12678512, is the definitive solution for your vehicle. We take the guesswork out of the repair. When you place your order, you provide us with your Vehicle Identification Number (VIN). Our specialists then flash the module with the latest, most stable GM-approved software specific to your Corvette. It arrives at your door ready for a straightforward installation, restoring the precise control your engine needs.

Plug-and-Play Installation: No Dealer Visit Required

Installing your new ECM is a job you can handle in your own garage. For the 2009 Corvette, the module is located in the right-hand (passenger side) engine compartment.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for all system capacitors to discharge.
2. Locate the ECM: Find the module in the passenger-side engine bay. It will have several large electrical connectors attached.
3. Disconnect Connectors: Carefully release the locking tabs on each electrical harness connector and pull them straight off the module. Do not force them.
4. Remove the Old Module: Unbolt the mounting hardware holding the old ECM in place and remove it from the vehicle.
5. Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
6. Reconnect and Secure: Firmly plug the electrical connectors back into the new module until they click into place. Reconnect the negative battery terminal.
7. Final Step: You may need to perform a security relearn procedure, which can typically be done without special tools by cycling the key. Your vehicle’s service manual will have the specific steps.

Guaranteed Compatibility and Interchangeability

This module is a direct replacement for a wide range of GM vehicles and is interchangeable with several service numbers. Please verify your part number or vehicle in the list below.

Replaces Part Numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512

Fits a Wide Range of Models Including:

• 2009 Corvette (ZR1)
• 2009 Cadillac CTS (6.2L), SRX (4.6L), STS (4.4L, 4.6L), XLR
• 2009-2011 Cadillac DTS, Buick Lucerne (4.6L)
• 2009-2012 Chevrolet Colorado / GMC Canyon (2.9L, 3.7L)
• 2009 Chevrolet Trailblazer (6.0L), GMC Envoy (5.3L)
• 2009-2010 Hummer H3 (3.7L)
• 2009 Saab 9-7X