Restore Your Vehicle’s Core Performance
Is your Cadillac XTS, Escalade, or GM truck suffering from baffling electrical issues, poor performance, or a persistent check engine light? The Engine Control Module (ECM), often called the vehicle’s main computer, is the central command for all engine functions. When it fails, it can lead to a cascade of problems that are often misdiagnosed, costing you time and money on unnecessary parts. This replacement Engine Control Module, part number 12674052, is the definitive solution to restore your vehicle’s factory performance and reliability.
This isn’t just a generic, off-the-shelf part. We provide a crucial service by programming this module specifically to your vehicle’s unique Vehicle Identification Number (VIN) before it ships. This ensures that all factory settings, security information, and performance parameters are a perfect match for your vehicle’s configuration. By loading the latest official GM software updates, we help resolve common issues and ensure optimal engine operation, fuel efficiency, and emissions control.
From the Diagnostic Bay
We had a 2017 Sierra 1500 in the shop that was a real head-scratcher. The owner had already replaced the throttle body and two O2 sensors trying to chase down an intermittent stalling issue and erratic idle. The check engine light would come and go. After hours of diagnostics, we found no issues with the wiring or sensors. On a hunch, we monitored the live data stream from the ECM and noticed the fuel trim values were jumping erratically for no reason. The original ECM was failing internally, sending faulty commands. We installed a VIN-programmed module just like this one, performed the quick security relearn, and the truck ran perfectly. It’s a classic case of the symptoms pointing elsewhere, but the root cause being the computer itself.
Is Your ECM Failing? Common Symptoms
A faulty engine computer can manifest in numerous ways. If you’re experiencing any of the following, a failing ECM could be the culprit:
- ✔ Check Engine Light: The most common sign, often with communication-related trouble codes (U-codes) or multiple random sensor codes.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire as the ECM fails to properly manage spark and fuel delivery.
- ✔ No-Start Condition: The vehicle cranks but refuses to start because the ECM is not activating the fuel pump or ignition coils.
- ✔ Reduced Fuel Economy: Incorrect air/fuel mixture calculations can cause a noticeable drop in MPG.
- ✔ Poor Performance: You may notice a significant loss of power, hesitation during acceleration, or inconsistent shifting from the automatic transmission.
- ✔ Communication Failure: A diagnostic scan tool may be unable to connect with the vehicle, indicating a complete failure of the module.
Your Solution: A VIN-Programmed 2017 XTS Engine Module
Replacing your engine computer doesn’t have to be a trip to the dealership. Our process is designed to be straightforward. Simply purchase this module and provide us with your vehicle’s 17-digit VIN. Our technicians will use professional GM-approved equipment to flash the unit with the correct calibration file for your specific vehicle. This critical step ensures that when you receive the part, it’s ready for installation and the final security handshake with your vehicle’s other modules.
Important Installation Information
Upon installing the newly programmed module, your vehicle’s anti-theft system will need to recognize it. This requires a procedure known as a “Vehicle Theft Deterrent Relearn.” This is a standard security measure on all modern GM vehicles. While sometimes the vehicle will start right away, it is common for this relearn to be necessary. This procedure must be performed by the end-user or their mechanic using a professional diagnostic tool with access to GM’s programming systems (like TIS2WEB or Techline Connect). Please be aware that this, along with any other specific relearns like crankshaft position variation or injector flow rate programming, is the responsibility of the installer.
Broad Compatibility Across the GM Lineup
While this listing focuses on the 2017 XTS Engine Module, this part is a direct replacement for a wide range of popular GM cars, trucks, and SUVs. It is compatible with multiple part numbers, including 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It fits models such as:
- Cadillac Escalade & Escalade ESV (2017)
- Cadillac XTS (2017, 3.6L LF3)
- Cadillac CTS (2017, 6.2L Supercharged & 3.6L LF3)
- Cadillac ATS (2017, 3.6L LF4)
- Chevrolet Tahoe & Suburban 1500 (2017)
- Chevrolet Silverado 1500 (2016-2018)
- GMC Yukon & Yukon XL 1500 (2017)
- GMC Sierra 1500 & Sierra Denali 1500 (2016-2018)
- Chevrolet Corvette (2017)
Always verify your original part number to ensure a perfect match.
Frequently Asked Questions
How does the VIN programming service work?
After you place your order, you must provide us with your 17-digit Vehicle Identification Number (VIN). Our technicians use this VIN to download the exact, most current GM factory software for your vehicle’s specific configuration and options. We then flash this software onto the module before shipping it to you.
What is a ‘theft relearn’ and will I need to do it?
The theft relearn is a security procedure that syncs the new ECM with your vehicle’s ignition keys and Body Control Module. It is a necessary step in most cases. If the vehicle does not start after installation, this procedure must be completed using a professional GM-compatible scan tool. This is the responsibility of the installer.
Is this part truly ‘plug and play’?
Because it comes pre-programmed to your VIN, it is as close to plug-and-play as possible. However, due to the required security relearn procedure and potential for other vehicle-specific setups (like crankshaft variation), we always recommend professional installation.
Do I need to send my old ECM back?
No core charge is required for this part. You can keep or responsibly dispose of your old module without needing to return it to us.
Where can I find my VIN?
Your VIN can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.