Restore Peak Performance to Your GM Vehicle
Is your 2015-2016 GMC Yukon, Silverado, or Escalade suffering from erratic engine behavior, a persistent Check Engine Light, or poor fuel economy? These are classic signs of a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifts and emissions control. When it falters, the entire vehicle’s performance and reliability are compromised. This genuine GM Engine Control Module, part number 12663391, is the definitive solution to restore your vehicle’s factory-specified operation.
From the Diagnostic Bay
A customer brought in their 2015 Sierra 1500 with a complaint of a random, harsh 1-2 shift and an intermittent stall at idle. There were no consistent trouble codes, just a U-code for lost communication that would pop up occasionally. We spent hours chasing grounds and checking wiring harnesses, thinking it was a simple connection issue. Finally, after monitoring live data, we saw the short-term fuel trim values spike erratically just before a stall. It was the ECM itself, with an internal fault causing it to momentarily lose its mind. Swapping in a pre-programmed module like this one had the truck running perfectly in under an hour. It’s a reminder that sometimes the ‘brain’ is the problem, not the ‘body’.
The Critical Importance of VIN Programming
Simply installing a used or new ECM from another vehicle will not work. Modern GM vehicles utilize sophisticated anti-theft systems and vehicle-specific calibrations that are tied directly to the Vehicle Identification Number (VIN). Our service eliminates the need for expensive dealership visits or specialized tools. We flash this module with the latest, most stable software release from General Motors, precisely matched to your vehicle’s VIN. This ensures all systems, options, and parameters are correctly configured for your specific build, providing a true plug-and-play experience once the simple key relearn procedure is completed.
Symptoms of a Failing 2015-2016 Yukon Engine Control Module
A failing ECM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your engine computer could be the culprit:
- ✔ Persistent Check Engine Light (CEL) with various or no specific codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Issues with other electronic modules, as the ECM is a central communication hub.
Guaranteed Fitment and Compatibility
This module, identified by part number 12663391, is a direct replacement for a wide range of GM trucks, SUVs, and performance cars. It is compatible with multiple service numbers, ensuring a perfect match for your original part. Please verify your vehicle is on the list below. Compatible part numbers include: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12672963, and 12669318.
This part will fit these makes and models with these options:
- ATS 2014-2016
- CAMARO 2016 (6.2L)
- CANYON 2015-2016 (3.6L)
- COLORADO 2015-2016 (3.6L)
- CORVETTE 2014-2016
- CTS 2014-2016 (3.6L, 6.2L)
- ESCALADE & ESCALADE ESV 2015-2016
- SIERRA 1500 PICKUP & DENALI 1500 2014-2016
- SILVERADO 1500 PICKUP 2014-2016
- SUBURBAN 1500 2015-2016
- TAHOE 2015-2016
- XTS 2014-2016 (3.6L)
- YUKON & YUKON XL 1500 2015-2016
Frequently Asked Questions
Do I need to do anything after installing this ECM?
While we handle the main programming to your VIN, you will need to perform a simple security relearn procedure (also known as a key relearn). This process syncs the new ECM with your vehicle’s anti-theft system and keys. It typically takes 10-30 minutes and does not require any special tools. We include instructions to guide you through this straightforward process.
Where do I provide my VIN?
After you complete your purchase, you can send us your 17-digit VIN through the messaging system or include it in the ‘notes to seller’ section during checkout. We cannot program and ship the module without your vehicle’s specific VIN.
Is this a new or used part?
This is a high-quality, tested, and inspected original equipment (OE) part, sourced from vehicles and guaranteed to function correctly. We ensure it is loaded with fresh, vehicle-specific software from GM for optimal performance.
Will this fix my vehicle’s problem?
This ECM will correct any issues directly caused by a faulty engine computer. However, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other faulty components like sensors, wiring, or mechanical parts. A correct diagnosis is key to a successful repair.
What is your warranty on this module?
We stand behind our products with a comprehensive warranty. Please see the warranty tab on this page for specific details regarding coverage period and terms for this particular part.