Restore Peak Performance to Your GM Vehicle
Is your Cadillac, Chevrolet, or GMC suffering from baffling engine problems? A faulty Engine Control Module (ECM) is often the hidden culprit behind issues like poor performance, random stalling, erratic shifting, and a persistent Check Engine Light. As the central computer of your vehicle, a failing ECM can create a cascade of frustrating and hard-to-diagnose symptoms. This replacement Engine Control Module, part number 12674052, is the definitive solution to restore your vehicle’s reliability and drivability.
Unlike a generic or salvage yard part that can cause more headaches than it solves, this module is professionally programmed to your specific Vehicle Identification Number (VIN) before it ships. We load the latest, most stable software calibrations directly from GM. This critical step ensures seamless communication between the ECM and all other vehicle systems, from the transmission to the fuel injectors, providing a level of precision that a non-programmed unit simply cannot match. By starting with the correct software foundation, you eliminate guesswork and ensure your 2017 XTS Engine Module operates exactly as the manufacturer intended.
From the Diagnostic Bay: The Intermittent Stall Mystery
A customer brought in a 2017 Sierra 1500 with an intermittent stalling problem that two other shops couldn’t solve. They had already replaced the fuel pump and throttle body. When it arrived at my bay, it ran perfectly. However, after a long test drive, it stalled at a stoplight and threw a P0606 (ECM/PCM Processor Fault) code. The internal processor of the original ECM was failing under heat soak. We installed a VIN-programmed module like this one, performed the crankshaft variation relearn, and the truck has run flawlessly ever since. It’s a classic case where chasing symptoms is expensive, but replacing the core problem—the ECM—is the true fix.
Is Your Vehicle Showing These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- ✔ Unexplained Check Engine Light with codes like P0601, P0606, or U0100
- ✔ Engine stalling or misfiring for no apparent reason
- ✔ Noticeable decrease in fuel economy
- ✔ Rough or inconsistent engine idling
- ✔ Transmission shifting issues or harsh engagement
- ✔ Vehicle entering ‘limp mode’ with reduced power
- ✔ Complete no-start or no-crank condition
A Straightforward Guide to Installation
Replacing your 2017 XTS Engine Module is a manageable task for an experienced DIYer or any professional technician. Follow these steps for a successful installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts.
- Locate the ECM: The module is typically found in the engine compartment, often on the driver’s side (LH) front area or, on some models like the Corvette, under the RH cowl. Refer to your vehicle’s service manual for the exact location.
- Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Do not force them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM securely onto the bracket and reconnect the wiring harnesses. Ensure they click firmly into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Relearn Procedures: This is a critical final step. If the vehicle does not start, you must perform a Vehicle Theft Deterrent System (VTDS) relearn using a compatible GM diagnostic tool (like Tis2web/Techline Connect). Additional procedures such as a Crankshaft Variation Relearn may also be required for optimal performance. This is the responsibility of the installer.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It is guaranteed to fit the following GM models and engine options:
- 2017 Cadillac Escalade / Escalade ESV
- 2017 Cadillac XTS (3.6L, VIN 8, opt LF3)
- 2017 Cadillac CTS (6.2L Supercharged or 3.6L Twin Turbo VIN 8, opt LF3)
- 2017 Cadillac ATS (3.6L, VIN Y, opt LF4)
- 2017 Chevrolet Corvette
- 2017 Chevrolet Tahoe / Suburban 1500
- 2016-2018 Chevrolet Silverado 1500 Pickup
- 2017 GMC Yukon / Yukon XL 1500
- 2016-2018 GMC Sierra 1500 Pickup / Sierra Denali 1500
A properly functioning 2017 XTS Engine Module is vital for your vehicle’s health. Order today and restore the communication and performance your GM vehicle was built to deliver.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle the primary programming for you. We will flash the module with the latest GM software calibrated specifically to your vehicle’s VIN before we ship it.
What is a ‘theft relearn’ and will I need to do it?
A theft relearn synchronizes the new ECM with your vehicle’s anti-theft system. If the vehicle doesn’t start after installation, this procedure is required. It must be done with a professional GM-compatible scan tool.
Where do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot program or ship your module without it. Please double-check it for accuracy.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part. It is guaranteed to function correctly once programmed and properly installed.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601-P0606), then this part will solve the issue. Always ensure you have properly diagnosed the problem before ordering.