Restore Peak Performance to Your GM Truck or SUV
Is your 2014-2016 GMC Sierra Denali 1500, Chevrolet Silverado, or other compatible GM vehicle suffering from perplexing engine issues? A faulty Engine Control Module (ECM) is often the culprit behind problems like stalling, misfires, a persistent check engine light, or even a no-start condition. The ECM is the central computer, the ‘brain’ of your engine, meticulously managing everything from fuel injection and ignition timing to emissions control and transmission shifting. When it fails, the entire system can become unreliable.
This genuine GM Engine Control Module, part number 12669318, is the definitive solution to get your vehicle running correctly again. Unlike a generic part from a local store, this unit comes pre-programmed specifically for your vehicle. We use the Vehicle Identification Number (VIN) you provide to flash the module with the latest, most stable software directly from General Motors. This critical step ensures seamless communication with all other vehicle systems, eliminating the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2015 Sierra 1500 come into the shop with a classic ‘no-start’ condition after a heavy rain. The owner had already replaced the battery and starter. After checking the basics, we found no communication with the ECM on our scan tool. The original module, located on the LH front of the engine compartment, had signs of water intrusion at the main connector. A replacement, pre-programmed ECM like this one had the truck starting and running perfectly in under 30 minutes, saving the customer hundreds in diagnostic time and dealership programming fees.
Diagnosing a Faulty 2014-2016 Sierra Denali ECM
A failing engine computer can manifest in numerous ways, often mimicking other component failures. If your truck is exhibiting any of the following symptoms, your ECM may be the root cause. This module is the direct replacement to solve these issues.
- ✔ Persistent Check Engine Light: Often with communication-related trouble codes (U-codes) or multiple, seemingly unrelated sensor codes.
- ✔ Engine Stalling or Misfiring: The engine may shut off unexpectedly while driving or run rough, especially under load.
- ✔ No-Start Condition: The engine cranks but refuses to start, indicating a lack of fuel or spark command from the ECM.
- ✔ Drastic Decrease in Fuel Economy: An improperly functioning ECM can’t efficiently manage the air-fuel mixture, leading to wasted gas.
- ✔ Failed Emissions Test: The ECM is central to the emissions control system. Its failure will almost certainly cause an emissions test failure.
- ✔ Unpredictable Transmission Behavior: The ECM works with the Transmission Control Module (TCM) to ensure smooth shifting. A bad ECM can cause harsh shifts or gear hunting.
Plug-and-Play Simplicity
The most significant benefit of this module is the VIN-specific programming we perform before shipping. This means the unit arrives at your door ready for installation. Simply disconnect the battery, swap the old module with this one, reconnect the battery, and perform a simple security relearn procedure (if necessary). You bypass the dealership’s high labor costs and scheduling delays, putting you back in control of your repair.
This module is a direct replacement for a wide range of part numbers, including: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, and 12672963. It fits an extensive list of GM vehicles from 2014 to 2016, such as the Chevrolet Silverado, Tahoe, Suburban, Corvette, Camaro, Cadillac Escalade, ATS, CTS, and GMC Yukon, among others. Please verify your part number or consult the fitment list to ensure compatibility.
Frequently Asked Questions
Is this ECM ready to install right out of the box?
Yes. This ECM is flashed with the latest GM software matched to the VIN you provide during checkout. This ensures it is ready for installation, making the process as simple as possible.
How do I provide my vehicle’s VIN?
After you complete your purchase, you will be prompted to provide your 17-digit VIN. You can also send it to us via email with your order number. We cannot ship the module until we have your VIN to program it correctly.
Will I need to do any other programming after installation?
In most cases, no additional programming is required. However, some GM vehicles may require a simple security relearn procedure, also known as a ‘key cycle relearn.’ This procedure can be done without any special tools and typically takes about 10-15 minutes. Instructions are readily available online or can be provided upon request.
Is this a new or used part?
This is a high-quality, thoroughly tested, genuine OEM used component. Each module is inspected and verified to be fully functional before being programmed and shipped, offering OEM reliability at a significant saving compared to a new part from a dealer.
What is the warranty on this ECM?
This part comes with our standard warranty, which covers the part against defects. Please see our warranty page for full details and terms of coverage.
What if my part number is slightly different?
This ECM, part number 12669318, supersedes and is compatible with several other part numbers listed in the description, such as 12692067, 12676230, and more. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.