Is Your 2017 Yukon XL Running Rough? The Solution is Here.
As a technician with over two decades of experience under the hood, I’ve seen countless GM trucks and SUVs come into the shop with baffling issues: erratic idling, a persistent check engine light, poor fuel economy, or even a frustrating no-start condition. More often than not, the culprit is a failing Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, and when it starts to fail, it can cause a cascade of problems that are difficult to diagnose. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded.
Symptoms of a Failing GM Engine Computer
If your Yukon XL, Sierra, or Escalade is experiencing any of the following, a faulty ECM could be the root cause:
- โ Check Engine Light (CEL) is on with various communication or processor codes.
- โ The engine cranks but refuses to start.
- โ Noticeable decrease in fuel mileage.
- โ Stalling, stumbling, or hesitation during acceleration.
- โ Transmission shifting issues or harsh shifts.
- โ Communication loss with your diagnostic scan tool.
The Smart Fix: A VIN-Programmed 2017 Yukon XL ECM
Forget the hassle and high cost of a dealership visit. We offer a direct, effective solution. This Engine Control Module, part number 12678815, arrives at your door pre-programmed with the latest official GM calibrations specific to your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This ensures that the module you receive is perfectly matched to your truck’s factory specifications, restoring its original performance and efficiency.
Expert Pro Tip: Check for External Faults First
Before you condemn your old ECM, it’s crucial to ensure an external issue didn’t cause the failure. In my shop, I’ve seen new ECMs get damaged immediately because the root cause wasn’t fixed. A common culprit on these GM platforms is a shorted fuel injector or a faulty ignition coil. A quick resistance check on the injectors and coils can save you from repeat failure. A healthy injector should typically read between 11-14 ohms. If you find one that’s shorted (near 0 ohms), replace it before installing your new ECM.
Installation and Required Procedures
Replacing the ECM is a straightforward process. However, it’s critical to understand that post-installation steps are required. Because this module is integral to your vehicle’s security system, you will likely need to perform a Vehicle Theft Deterrent (VTD) relearn. This procedure synchronizes the new ECM with your vehicle’s keys and security components.
Please Note: This VTD relearn, along with any other necessary setups like a crankshaft variation relearn or fuel injector flow rate programming, is the responsibility of the installer. These procedures require a professional scan tool with access to GM’s Tis2web or Techline Connect software. This is standard practice for any professional ECM replacement.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and part numbers, ensuring a perfect fit and function. It is compatible with the following part numbers:
- 12678815
- 12692068
- 12704476
- 12686382
- 12674052
- 12674472
This part fits many 2016-2018 GM models including the Escalade, Tahoe, Suburban, Sierra 1500, Silverado 1500, Corvette, CTS, XTS, and ATS with specific engine options. Please verify the part number on your original module to ensure proper fitment.