Restore Your Yukon’s Brainpower and Performance
Is your 2015-2016 GMC Yukon XL 1500 running rough, stalling, or displaying a persistent check engine light? These are classic signs that the Engine Control Module (ECM), the vehicle’s central computer, may be failing. The ECM is responsible for managing everything from fuel injection and ignition timing to transmission shifts and emissions control. When it malfunctions, it can cause a cascade of frustrating and potentially damaging issues. This replacement Engine Control Module, part number 12663391, is the definitive solution to restore your vehicle’s factory performance, reliability, and efficiency.
We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store, this unit arrives at your door fully programmed to your specific vehicle. Simply provide us with your Yukon’s Vehicle Identification Number (VIN) during checkout, and our technicians will flash the module with the latest, most stable software updates directly from GM. This ensures perfect communication between the ECM and all other vehicle systems, eliminating the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2015 Yukon XL come into the shop with a complaint of intermittent stalling and a P0606 (ECM Processor Fault) code. The owner had already replaced the throttle body and a few sensors with no luck. After confirming power and ground to the module were solid, we knew the internal processor was the culprit. A quick swap with one of our VIN-programmed modules had the truck running perfectly in under 30 minutes. The customer was thrilled to avoid a costly dealership visit and get a reliable fix that addressed the root cause, not just the symptoms.
Diagnosing and Replacing Your 2015-2016 Yukon XL ECM
A failing ECM can manifest in various ways, often mimicking other component failures. It’s crucial to recognize the signs to avoid replacing perfectly good parts. If your Yukon is experiencing a combination of the issues listed below, the ECM is a primary suspect. Replacing the module is a straightforward process for a DIY mechanic or any professional technician. Located in the left-hand front of the engine compartment, it’s typically held in place by a few bolts and has several large electrical connectors. Our pre-programmed module makes the physical swap the only step required to get back on the road.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with communication-related or internal processor fault codes.
- ✔ Engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Misfire codes that persist even after replacing spark plugs and coils.
- ✔ Loss of power and overall poor engine performance.
This module is a direct-fit replacement, compatible with a wide range of GM trucks and SUVs, including the Sierra, Silverado, Escalade, and Tahoe. It cross-references with multiple part numbers, including 12692067, 12676230, 12656993, and more, ensuring broad compatibility. By providing your VIN, you guarantee that you receive a module with the correct software calibration for your vehicle’s specific options and emissions equipment.
Frequently Asked Questions
Do I need to do any programming after I receive this ECM?
No. This ECM comes fully programmed to your vehicle’s VIN with the latest GM software. It is ready for installation right out of the box. In some cases, a security relearn procedure may be required, which can be done without special tools and instructions are readily available online.
Where do I provide my vehicle’s VIN?
Please provide your 17-digit VIN in the notes section during checkout or send it to us via email after placing your order. We cannot program and ship the module without it.
Is this a brand new part?
This is a high-quality, genuine OEM part that has been thoroughly inspected, tested, and prepared for service. It is loaded with new, vehicle-specific software to ensure optimal performance.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (e.g., internal processor codes, communication errors), this part will resolve the issue. It’s essential to properly diagnose the vehicle first, as other failing sensors or components can also trigger a check engine light.
What is the warranty on this module?
This part comes with our standard warranty, ensuring it is free from defects in function. Please refer to our website’s warranty page for complete details and duration.