Is Your Yukon Running Rough? The Engine Control Module Might Be the Culprit.
The Engine Control Module (ECM), often called the engine’s brain, is the master computer responsible for managing your 2015-2016 GMC Yukon’s performance, fuel efficiency, and emissions. When it begins to fail, it can cause a cascade of confusing and frustrating problems, from a simple check engine light to a vehicle that won’t start at all. If you’re experiencing erratic engine behavior, poor fuel economy, or stalling, a failing ECM is a likely cause. This module, part number 12672537, is the direct-fit, reliable solution to get your vehicle operating as the factory intended.
From the Diagnostic Bay
We had a 2015 Escalade (which uses the same ECM) come into the shop with a list of bizarre symptoms the owner had been chasing for months. The transmission would shift hard intermittently, the check engine light would come on and off with random codes, and sometimes it would crank but not start. Several shops had replaced sensors and wiring to no avail. We suspected the ECM. After installing a VIN-programmed module just like this one, every single issue vanished. The root cause wasn’t a dozen small problems; it was one faulty computer sending incorrect signals. It’s a perfect example of how a failing ECM can mimic many other component failures.
Symptoms of a Failing Engine Control Module
- ✔ Check Engine Light is illuminated, often with communication-related (U-codes) or performance codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Transmission shifting erratically or harshly.
- ✔ The engine cranks but refuses to start.
- ✔ Misfires or rough idling.
- ✔ Loss of power and poor overall performance.
- ✔ Problems with other electronic systems tied to the engine’s network.
The Plug-and-Play Solution: A Pre-Programmed 2015-2016 Yukon ECM
Replacing an ECM isn’t as simple as swapping the part. Modern vehicle computers are coded specifically to the Vehicle Identification Number (VIN) of the car they belong to. Our service eliminates the need for an expensive trip to the dealership for programming. When you order from us, you simply provide your vehicle’s VIN. We then flash this ECM with the latest, most stable software updates directly from GM. This ensures that the module you receive is perfectly matched to your Yukon’s specific options and systems. It arrives at your door ready for installation, saving you time, money, and hassle.
This module is a genuine OEM part, ensuring perfect compatibility and long-term reliability. It is also compatible with a wide range of other GM trucks and cars from the same era, including the Cadillac Escalade, Chevy Silverado 1500, GMC Sierra 1500, Chevy Tahoe, and more. Please verify your original part number or consult the fitment list to confirm this is the correct part for your vehicle.
Installation and Post-Install Procedures
On most 2015-2016 GMC Yukons and similar GM trucks, the ECM is located in the front of the engine compartment on the driver’s side. The installation process is straightforward for a competent DIY mechanic:
- Disconnect the Battery: Always disconnect the negative battery terminal before working on any electronic components.
- Locate and Remove the Old ECM: Carefully unplug the wiring harness connectors and unbolt the module from its bracket.
- Install the New ECM: Bolt the new module in place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Security Relearn Procedure: After installation, your vehicle’s anti-theft system may need to be relearned to the new ECM. This can often be done without special tools by cycling the key in the ignition. A common procedure is to turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeat this cycle three times. Your vehicle’s specific procedure may vary. A Crankshaft Position Variation (CASE) relearn may also be required, which typically needs a capable scan tool.
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 17-digit VIN during checkout, and we will flash the module with the correct GM software for your specific vehicle.
Where is the ECM located on my 2015-2016 Yukon?
The Engine Control Module is typically found in the engine bay, on the driver’s side (LH side) near the front of the vehicle. It’s an aluminum box with multiple large electrical connectors.
What happens if I forget to provide my VIN?
We cannot ship your order without your VIN. Programming is a critical step to ensure the part functions correctly in your vehicle. We will contact you to obtain the VIN, which may delay your shipment.
Will this part fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. However, it’s essential to properly diagnose the problem first, as the light can be triggered by many other failing components like sensors or wiring issues.
Is any special procedure required after I install this module?
In many cases, you may need to perform a security relearn procedure (also known as a Passlock or anti-theft relearn) for the vehicle to start. This can often be done without special tools. A Crankshaft Position Variation (CASE) relearn might also be necessary to clear certain trouble codes, which requires a compatible scan tool.