Programmed 2017 ATS Engine Control Module ECM 12686382

Restore Peak Performance to Your GM Vehicle

There’s nothing more frustrating than a vehicle that won’t start, runs rough, or constantly throws a check engine light. When the Engine Control Module (ECM)—the brain of your engine—starts to fail, it can cause a cascade of confusing and debilitating problems. This isn’t just an inconvenience; it’s a critical failure that can leave you stranded. This direct-fit ECM, part number 12686382, is the definitive solution for getting your vehicle back on the road with confidence.

We take the biggest hassle out of the replacement process. Before this module ever leaves our facility, we program it with the latest official GM calibrations specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This means you receive a part that is ready for the final, on-vehicle security handshake, saving you a costly and time-consuming trip to the dealership for initial programming.

Is Your Vehicle Showing These Symptoms?

• ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U0100.
• ✔ The engine cranks but refuses to start.
• ✔ Intermittent stalling or rough idling for no apparent reason.
• ✔ A noticeable drop in fuel economy.
• ✔ The vehicle is in “limp mode,” with reduced power.
• ✔ Automatic transmission shifts harshly or at the wrong times.
• ✔ Communication errors with your diagnostic scan tool.

Your Step-by-Step ECM Installation Roadmap

1. ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes for the system capacitors to discharge.
2. ✔ Locate the ECM: On the 2017 ATS, the ECM is found in the left-hand (driver’s side) of the engine compartment. For other models, its location may vary (e.g., under the dash on a Corvette). Refer to your service manual if unsure.
3. ✔ Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that must be released first—don’t force them. Then, unbolt the module from its mounting bracket.
4. ✔ Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
5. ✔ Reconnect Battery: Reattach the negative battery terminal.
6. ✔ Perform Security Relearn: This is a critical step. If the vehicle does not start, you or your mechanic will need to perform the Vehicle Theft Deterrent (VTD) relearn using a compatible GM diagnostic tool (like Tis2web/Techline Connect). This syncs the new ECM with your vehicle’s anti-theft system.
7. ✔ Additional Relearns: Depending on your vehicle, other procedures like a Crankshaft Variation Relearn may be necessary to ensure optimal performance. This is the responsibility of the installer.

Verified Vehicle Compatibility

This module is a direct replacement for part number 12686382 and interchanges with 12692068, 12704476, 12674052, 12674472, and 12678815. It is confirmed to fit the following vehicles:

• ✔ 2017 Cadillac ATS (3.6L, VIN Y, opt LF4)
• ✔ 2017 Cadillac CTS (6.2L Supercharged or 3.6L Twin Turbo)
• ✔ 2017 Cadillac Escalade / Escalade ESV
• ✔ 2017 Cadillac XTS (3.6L, VIN 8, opt LF3)
• ✔ 2017 Chevrolet Corvette
• ✔ 2017 Chevrolet Silverado 1500 Pickup
• ✔ 2018 Chevrolet Silverado 1500 Pickup (ID 12686382)
• ✔ 2017 Chevrolet Suburban 1500
• ✔ 2017 Chevrolet Tahoe
• ✔ 2017 GMC Sierra 1500 Pickup
• ✔ 2018 GMC Sierra 1500 Pickup (ID 12686382)
• ✔ 2017 GMC Sierra Denali 1500
• ✔ 2018 GMC Sierra Denali 1500 (ID 12686382)
• ✔ 2017 GMC Yukon / Yukon XL 1500

Frequently Asked Questions