Restore Your Corvette’s Brain, Restore Its Performance
As a technician with over two decades of experience, I know the frustration of a high-performance vehicle like a 2014-2016 Corvette not running as it should. When your Vette starts acting up—stumbling, throwing a check engine light, or refusing to start—the cause can often be traced back to the very brain of the operation: the Engine Control Module (ECM). This isn’t just another part; it’s the central command center for your engine’s performance, fuel delivery, and emissions. A failing ECM can turn your precision machine into a problematic paperweight.
We offer a straightforward, reliable solution. This is a genuine GM Engine Control Module, part number 12656993, that arrives at your door fully programmed to your vehicle’s specific VIN. Forget the expensive tow to the dealership and their hefty programming fees. We handle the critical software flashing for you, loading the latest GM updates to ensure optimal function and compatibility. This makes the replacement process as simple as possible for both seasoned mechanics and dedicated DIY owners.
Case Study: A Tricky Diagnosis
I remember a 2015 Corvette Z06 that came into the shop with a maddeningly intermittent issue. The owner complained of random power loss and a flickering check engine light. We scanned it and pulled a P0606 (ECM/PCM Processor Fault) and a U0100 (Lost Communication With ECM/PCM). After hours of checking wiring harnesses and grounds—which all looked perfect—we suspected an internal ECM failure. Instead of rolling the dice on a used module and then paying for programming, the owner opted for one of our pre-programmed units. The install took less than an hour, and the car ran flawlessly. It was a textbook example of how a reliable, pre-flashed 2014-2016 Corvette ECM can save hours of diagnostic headaches and get the vehicle back to its peak performance without delay.
Is Your Corvette Showing These ECM Failure Signs?
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Diagnostic Trouble Codes (DTCs) pointing to internal module failure, such as P0601, P0606, or P060A.
- ✔ Communication errors with other vehicle modules, often indicated by codes like U0100.
- ✔ Unexplained engine performance problems, including misfires, rough idling, or poor acceleration.
- ✔ The engine cranks but refuses to start (no-start condition).
- ✔ Inconsistent or poor fuel economy.
- ✔ Issues with the automatic transmission shifting erratically, as the ECM communicates with the TCM.
Your Straightforward Installation Guide
Replacing the 2014-2016 Corvette ECM is a manageable job for a DIYer with basic tools. Since we handle the programming, you can skip the most complex step. The ECM is located on the right-hand side, under the cowl panel near the dash.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the Module: On the C7 Corvette, you will need to access the area under the passenger-side cowl panel at the base of the windshield.
- Disconnect Connectors: Carefully release the locking tabs and disconnect all electrical wiring harnesses from the old ECM. Take care not to damage the pins or connectors.
- Remove the Old ECM: Unbolt the module from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New ECM: Mount your new, pre-programmed module in place and securely fasten it.
- Reconnect Everything: Plug the wiring harnesses back into the new ECM, ensuring each connector clicks firmly into place. Reconnect the negative battery terminal.
- Final Steps: In some cases, a security relearn or throttle relearn procedure may be necessary. This can typically be done without special tools by following a specific key-on/key-off sequence found in service information or online forums. Start the vehicle and check for proper operation.
Why Choose Our Programmed ECM?
This isn’t just a replacement part; it’s a complete service. By providing us with your VIN at checkout, you receive a 2014-2016 Corvette ECM that is truly plug-and-play. We flash it with the most current, stable software from General Motors, which can resolve underlying drivability issues that older software versions may have had. This process ensures the module communicates perfectly with your car’s other systems, from the transmission to the ABS, right out of the box.
Verified Fitment For Your Vehicle
This module is a direct replacement for part number 12656993 and is also compatible with part numbers 12692067, 12676230, 12662034, 12672537, 12673195, 12663391, 12672963, and 12669318. It fits a wide range of GM vehicles, including:
- ✔ CORVETTE 14-16 Electronic Control Module; (RH cowl under dash)
- ✔ CAMARO 16 Electronic Control Module; 6.2L
- ✔ CTS 14-15 Electronic Control Module; Sdn, 3.6L
- ✔ CTS 16 Electronic Control Module; 3.6L, VIN 8 (8th digit, opt LF3) or 6.2L
- ✔ ATS 14 Electronic Control Module; (LH engine compartment), ID 12656993
- ✔ ATS 15 Electronic Control Module; (LH engine compartment), 3.6L
- ✔ ATS 16 Electronic Control Module; (LH engine compartment), 3.6L, VIN Y (8th digit, opt LF4)
- ✔ XTS 14-16 Electronic Control Module; (3.6L), VIN 8 (8th digit, opt LF3)
- ✔ SILVERADO 1500 PICKUP 14-16
- ✔ SIERRA 1500 PICKUP / DENALI 1500 14-16
- ✔ TAHOE / SUBURBAN 1500 15-16
- ✔ YUKON / YUKON XL 1500 15-16
- ✔ ESCALADE / ESCALADE ESV 15-16
- ✔ COLORADO / CANYON 15-16 Electronic Control Module; (RH firewall), 3.6L
Frequently Asked Questions
How does the programming process work?
It’s simple. After you complete your purchase, you provide us with your vehicle’s 17-digit VIN. Our technicians then use official GM equipment to load the specific software and calibrations for your exact vehicle onto the ECM before shipping it to you.
Do I need to send my old ECM to you?
No, this is not a repair service and there is no core charge. You are purchasing a replacement module that is programmed and ready for installation.
Is this part difficult to install myself?
For someone with basic mechanical skills, it’s a very manageable job. The most difficult part of an ECM replacement is typically the programming, which we have already done for you. Please refer to our installation guide above.
Will I need to perform any other procedures after installation?
In many cases, the vehicle will start and run perfectly after installation. However, some GM vehicles may require a simple, key-on/key-off security relearn procedure to sync the new ECM with the anti-theft system. This procedure does not require special scan tools.
What if I have a different part number on my original module?
This module (12656993) supersedes and is compatible with several other GM part numbers. Please check the fitment list provided. If your part number is listed, this module will work for your vehicle once programmed to your VIN.