Is your Cadillac XTS, Silverado, or other GM vehicle experiencing perplexing issues like a persistent check engine light, stalling, or poor performance? The Engine Control Module (ECM), often called the vehicle’s brain, is a likely culprit. This vital component manages everything from fuel injection and ignition timing to emissions control and transmission shifting. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. This listing is for a direct-fit replacement ECM, part number 12676230, which arrives at your door programmed specifically for your vehicle’s VIN, ensuring a seamless installation process.
From the Diagnostic Bay
We had a 2015 GMC Sierra in the shop that was driving the owner crazy. It would randomly stall at stoplights, but never consistently enough to trigger a specific fault code. The previous shop had replaced the throttle body and a few sensors, costing the owner over a thousand dollars with no fix. When we got it, we noticed that the live data stream from the ECM would occasionally freeze just before a stall. After ruling out wiring issues, we suspected an internal ECM fault, likely triggered by heat soak in the engine bay. We installed a VIN-programmed ECM just like this one, performed the security relearn, and the truck ran perfectly. The owner was thrilled to finally have a reliable vehicle again after chasing the problem for months. This highlights how a faulty ECM can mimic other component failures, making accurate diagnosis key.
Common Symptoms of a Failing GM ECM
- ✔ Check Engine Light: The most common indicator, often with communication-related codes (U-codes) or internal processor fault codes (P06xx series).
- ✔ Engine Stalling or Misfiring: The engine may stall intermittently, especially when warm, or run rough due to incorrect fuel and spark commands.
- ✔ No-Start Condition: Your vehicle may crank but refuse to start because the ECM is not activating the fuel pump or ignition coils.
- ✔ Reduced Fuel Economy: An improperly functioning ECM can lead to an inefficient air-fuel mixture, causing your vehicle to consume more gasoline.
- ✔ Poor Performance: You might experience hesitation during acceleration, sluggish response, or erratic shifting from the automatic transmission.
- ✔ Communication Errors: A mechanic’s scan tool may be unable to communicate with the ECM, making diagnosis impossible.
Restoring Your Vehicle’s Performance with a Programmed 2014-2016 XTS ECM
Don’t let a faulty computer keep your vehicle off the road. This replacement Engine Control Module is the definitive solution for a wide range of GM cars and trucks. The most significant benefit is our professional VIN programming service. Before we ship the part, we flash it with the latest official GM software specific to your vehicle. This means the module arrives ready for installation, saving you the time, hassle, and high cost of having it programmed at a dealership. This is not a generic, one-size-fits-all part; it is tailored to your vehicle’s exact specifications, options, and emissions standards. By using a properly programmed 2014-2016 XTS ECM, you restore the precise factory control over your engine’s operations.
Simple Installation Process
Once you receive your VIN-programmed module, the physical installation is straightforward. In most cases, it involves disconnecting the battery, unplugging the electrical connectors from the old ECM, unbolting it, and then installing the new one in the reverse order. After installation, you will need to perform a simple Security Relearn Procedure (also known as a key relearn). This procedure syncs the new ECM with your vehicle’s anti-theft system and can typically be done in your driveway without any special tools. Instructions for this procedure are widely available and generally involve a series of key cycles. This simple final step is all that’s needed to get your vehicle running smoothly again.
This module is a direct replacement for multiple part numbers, including: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, and 12669318. It is compatible with a vast array of vehicles such as the Cadillac ATS, CTS, Escalade; Chevrolet Silverado, Corvette, Camaro, Colorado, Suburban, Tahoe; and GMC Sierra, Yukon, and Canyon. Please verify your part number or consult the detailed fitment list to ensure compatibility.
Frequently Asked Questions
Is this ECM ready to install when it arrives?
Yes, it comes fully programmed to the VIN you provide. The only remaining step after physical installation is a simple security relearn procedure, which you can do yourself without any special tools.
How do I provide my vehicle’s VIN?
After you complete your purchase, we will contact you for your vehicle’s 17-digit VIN. We cannot ship the module until we have this information to program it correctly.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, this part will resolve the issue. It’s crucial to have a proper diagnosis to confirm the ECM is the point of failure, as other sensors or wiring issues can cause similar symptoms.
Where is the ECM located on my vehicle?
The location varies by model. On many GM trucks like the Silverado and Sierra, it’s in the LH front of the engine compartment. On cars like the Corvette, it might be under the dash on the RH cowl. Please consult a repair manual for your specific vehicle.
Does this part fit vehicles other than the 2014-2016 Cadillac XTS?
Absolutely. This ECM is compatible with a wide range of GM cars, trucks, and SUVs from this era. Please check the detailed fitment list on this page and match your original part number to ensure it is correct for your application.