Programmed 2017 XTS Engine Module ECM ECU 12674052 | VIN Matched

Restore Peak Performance to Your GM Vehicle

Is your Cadillac, Chevrolet, or GMC plagued by baffling electrical problems, a persistent Check Engine Light, or a frustrating no-start condition? As a technician with over two decades of experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can bring an otherwise healthy vehicle to a dead stop. It’s the brain of your engine, and when it malfunctions, it can cause chaos—from poor fuel economy and rough idling to complete communication breakdown with other vehicle systems. This isn’t just an inconvenience; it’s a critical failure that needs a reliable solution.

This isn’t just a replacement part; it’s a direct-fit, plug-and-play solution designed to get you back on the road with confidence. We take the biggest headache out of the equation: programming. Simply provide us with your vehicle’s VIN at checkout, and our specialists will flash this module with the latest, most stable GM factory software specific to your car or truck. This means you receive a 2017 XTS Engine Module that is ready for installation, saving you the time, expense, and hassle of a dealership visit for programming.

Is Your Vehicle Showing These Symptoms?

A faulty ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution.

• ✔ Engine cranks but will not start.
• ✔ Persistent and unexplained Check Engine Light (CEL).
• ✔ Stored diagnostic trouble codes (DTCs) like P0601, P0606, or U0100.
• ✔ Noticeable drop in fuel efficiency.
• ✔ Rough or inconsistent engine idling and stalling.
• ✔ Transmission shifting issues or erratic behavior.
• ✔ Failure to pass state emissions testing.

A Straightforward Guide to Installation

Replacing the ECM is a manageable job for an experienced DIYer or any professional technician. Follow these steps for a successful installation.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
2. Locate the Module: The ECM is typically found in the engine bay (often on the driver’s side) or, on some models like the Corvette, under the cowl. Consult your vehicle’s service manual for the exact location.
3. Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that must be released. Once disconnected, unbolt the old module from its mounting bracket and remove it.
4. Install the New Module: Mount the new, pre-programmed ECM in the same location. Ensure it is securely bolted down.
5. Reconnect Everything: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect the negative battery terminal.
6. Perform Necessary Relearns: This is the most critical final step. You must perform a Vehicle Theft Deterrent System (VTDS) relearn using a compatible scan tool with access to GM’s TIS2WEB or Techline Connect. The vehicle will not start until this security handshake is completed. Other procedures, like a crankshaft variation relearn, may also be required depending on your specific vehicle.

Verified Vehicle Compatibility

This module is a direct replacement for part number 12674052 and is interchangeable with part numbers 12692068, 12704476, 12686382, 12674472, and 12678815. It is confirmed to fit the following GM models and engine options:

• Cadillac ATS (2017): 3.6L, VIN Y (LF4)
• Cadillac CTS (2017): 3.6L Twin Turbo, VIN 8 (LF3) / 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)

Frequently Asked Questions About This 2017 XTS Engine Module