Is Your GM Vehicle Running Rough, Stalling, or Showing a Check Engine Light?
As a technician with over 20 years of experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a reliable vehicle into a source of constant frustration. If your Cadillac, Chevy, or GMC is experiencing issues like random misfires, poor fuel economy, harsh shifting, or a dreaded no-start condition, the ECM is a primary suspect. This isn’t just a part; it’s the central computer for your engine, and when it fails, the symptoms can be unpredictable and difficult to diagnose. This listing is for a direct-fit replacement ECM, part number 12674472, which is the solution to restore your vehicle’s performance and peace of mind.
The Smart Solution: Pre-Programmed for Your Vehicle
Forget the hassle and high cost of a dealership visit. We take the complexity out of the repair by programming this module specifically for your vehicle before it ever leaves our facility. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and our experts will flash the unit with the latest, most stable software updates directly from GM. This ensures that when you receive the part, it has the correct calibration for your engine and transmission, eliminating compatibility guesswork.
- โ VIN-Specific Programming: We load the latest GM software calibrated precisely to your vehicle’s VIN.
- โ Resolves Common Failures: An effective fix for issues like false sensor codes, communication errors, and intermittent stalling.
- โ Direct-Fit Replacement: Engineered to replace a range of original part numbers, including 12692068, 12704476, 12686382, 12674052, and 12678815.
- โ Broad GM Compatibility: Fits a wide variety of popular GM cars, trucks, and SUVs from 2016-2018.
A Technician’s Guide to Your 2017 XTS Engine Control Module Replacement
Replacing an ECM can seem daunting, but it’s a manageable job for a confident DIYer or any professional shop. The key is understanding the process, especially the final security steps. Over the years, I’ve seen countless successful ECM swaps, and they all follow a few critical steps.
Expert Pro Tip: Check Your Connections First
Before you even order a new ECM, do a thorough visual inspection of your existing module’s connectors and the main engine ground straps. I’ve had vehicles towed to my shop with classic ‘bad ECM’ symptoms, only to find the problem was a loose or corroded ground connection to the engine block. A few minutes with a wire brush and a wrench can sometimes save you hundreds of dollars. Clean, tight connections are non-negotiable for proper computer function.
Installation and Setup Process
While the physical swap is straightforward, modern vehicles require a ‘handshake’ between new components and the security system. Please be aware of the following requirements:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any work on the electrical system.
- Locate and Replace: The ECM location varies by model (e.g., LH front engine compartment on a Sierra, RH cowl on a Corvette). Carefully disconnect the wiring harnesses and remove the old module. Install the new module and securely reconnect the harnesses.
- Reconnect Battery: Once the new ECM is installed, reconnect the negative battery terminal.
- Security Relearn Procedure: This is the most critical step. If the vehicle does not start after installation, it’s because the new ECM needs to be synchronized with your vehicle’s anti-theft system. This is NOT a defect. This procedure must be performed using a professional GM-compatible scan tool with access to GM’s TIS2Web or Techline Connect service.
IMPORTANT NOTICE: As the end user, you or your mechanic are responsible for performing the Vehicle Theft Deterrent System (VTDS) relearn. Additional procedures, such as a Crankshaft Position Variation Relearn or injector flow rate programming, may also be necessary depending on your specific vehicle and the codes present. This is standard procedure for ECM replacement on all modern GM vehicles.
Guaranteed Fitment For These Vehicles:
This module is the correct replacement for a wide array of GM models. Please verify your vehicle and options below:
- Cadillac ATS (2017): 3.6L, VIN Y (LF4)
- Cadillac CTS (2017): 3.6L Twin Turbo, VIN 8 (LF3) or 6.2L Supercharged
- Cadillac Escalade / ESV (2017)
- Cadillac XTS (2017): 3.6L, VIN 8 (LF3)
- Chevrolet Corvette (2017)
- Chevrolet Silverado 1500 (2016-2018)
- Chevrolet Suburban 1500 (2017)
- Chevrolet Tahoe (2017)
- GMC Sierra 1500 / Denali 1500 (2016-2018)
- GMC Yukon / Yukon XL 1500 (2017)