Is Your Yukon XL Running Rough? The ECM Might Be the Culprit.
If you’re experiencing frustrating issues like a persistent check engine light, poor fuel economy, stalling, or a no-start condition in your 2015-2016 GMC Yukon XL 1500, a failing Engine Control Module (ECM) is a likely cause. The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, it can cause a wide range of performance problems that can be difficult to diagnose. This direct-replacement ECM, part number 12663391, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
From the Diagnostic Bay
We recently had a 2015 Yukon XL in the shop that was driving the owner crazy. It had a random misfire code (P0300) that would come and go, and they had already replaced spark plugs, coils, and even an injector. Nothing worked. After hooking up our professional scan tool, we noticed that the fuel trim data was erratic and the injector pulse width commands were inconsistent. This pointed away from a mechanical issue and straight towards the computer. We installed a VIN-programmed ECM, and the truck immediately ran smooth as silk. It’s a classic case where chasing symptoms costs more time and money than addressing the root cause: the vehicle’s brain.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel mileage (MPG).
- ✔ Rough or erratic idling.
- ✔ Transmission shifting issues or harsh engagement.
- ✔ Complete no-start or intermittent starting problems.
- ✔ Communication errors with diagnostic scan tools.
The Solution: A VIN-Programmed 2015-2016 Yukon XL 1500 ECM
Don’t settle for a generic, unprogrammed module that will require expensive trips to the dealership for flashing. We take the guesswork and hassle out of the process. When you order from us, you provide your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians then use official GM equipment to flash the module with the latest, most stable software specific to your Yukon XL. This ensures perfect compatibility with your engine, transmission, and all related systems. It arrives at your door ready for installation, making the repair process significantly simpler and more affordable.
Guaranteed Fitment and Compatibility
This Engine Control Module is a direct replacement for a wide range of GM trucks and SUVs. It is compatible with multiple original equipment part numbers, ensuring a perfect match for your vehicle. Please verify your original part number or consult the list below.
Replaces Part Numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, 12669318
This module fits a variety of vehicles including:
- 2015-2016 GMC Yukon & Yukon XL 1500
- 2015-2016 Chevrolet Tahoe & Suburban 1500
- 2014-2016 Chevrolet Silverado 1500 & GMC Sierra 1500
- 2015-2016 Cadillac Escalade & Escalade ESV
- 2014-2016 Cadillac CTS, ATS, XTS
- 2014-2016 Chevrolet Corvette
- 2016 Chevrolet Camaro
- 2015-2016 Chevrolet Colorado & GMC Canyon
Please refer to the detailed fitment list in the product specifications to confirm compatibility with your specific model and options.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s VIN during checkout, and the module will arrive with the correct GM software for your specific vehicle, ready for installation.
Where is the ECM located on my 2015-2016 Yukon XL?
On most GM trucks and SUVs from this era, including the Yukon XL, the ECM is located in the engine compartment on the driver’s side (LH side), often near the firewall or inner fender.
Is any additional setup required after installation?
In many cases, the vehicle will start and run perfectly after installation. However, some GM vehicles may require a Security Relearn Procedure (also known as a Passlock or anti-theft relearn) and a Crankshaft Variation Relearn (CASE). These procedures can often be performed without special tools and instructions are widely available online.
How do I provide my VIN?
You can add your 17-digit VIN to the notes section during checkout or send it to us in a message after placing your order. We cannot program and ship your module without it.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty ECM, then yes, this part will resolve the issue. It’s crucial to ensure a proper diagnosis has been performed to confirm the ECM is the point of failure.