Restore Your Vehicle’s Brain and Get Back on the Road with Confidence
Is your Cadillac XTS, or another compatible GM vehicle, giving you headaches? Unexplained stalling, a persistent check engine light, or a complete no-start condition can be incredibly frustrating. Often, the culprit is a failing Engine Control Module (ECM)—the central computer responsible for managing engine performance, fuel delivery, and emissions. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel economy, and safety. Instead of facing a costly trip to the dealership, you have a dependable, straightforward solution right here.
This is a direct-fit replacement ECM, part number 12656993, that arrives at your door fully programmed to your specific vehicle. We take your Vehicle Identification Number (VIN) and flash the module with the very latest, most stable software updates directly from GM. This critical step ensures seamless integration with your vehicle’s systems, eliminating the need for expensive programming tools or additional dealer visits. By installing this 2014-2016 XTS Engine Control Module, you’re not just replacing a part; you’re restoring your vehicle’s core operational integrity.
A Technician’s Notebook
I remember a 2015 Cadillac CTS that came into the shop with a laundry list of intermittent electrical gremlins. The owner had already replaced the battery and alternator, but the car would still randomly refuse to start and threw a U0100 (Lost Communication with ECM/PCM) code. After hours of tracing wires, we confirmed the ECM itself was failing internally. The customer was worried about a massive dealership bill. We sourced one of these VIN-programmed modules. The installation took less than an hour, and because it was already flashed, the car started on the first try with all systems communicating perfectly. It’s a prime example of how the right part, prepared correctly, can save both time and money.
Common Signs of a Failing ECM
If you’re experiencing any of the following issues, a faulty engine computer is a likely cause. Replacing it with a quality, programmed module is the definitive solution.
- ✔ Check Engine Light is on with codes like P0601, P0606, or other internal processor faults.
- ✔ Vehicle refuses to start or has trouble starting.
- ✔ Poor engine performance, hesitation, or misfires.
- ✔ Noticeable decrease in fuel economy.
- ✔ Transmission shifting problems or harsh shifts.
- ✔ Communication errors with scan tools or other modules (U-codes).
- ✔ Intermittent stalling for no apparent reason.
A Straightforward Guide to Installation
For the confident DIYer or professional mechanic, installing this 2014-2016 XTS Engine Control Module is a manageable job. Always consult a vehicle-specific service manual for detailed instructions and torque specs.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: On most listed vehicles, the ECM is found in the engine compartment (often on the LH front side or firewall). Its location can vary, so confirm its position on your specific model.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and disconnect them from the old ECM. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware holding the ECM in place and remove the old unit from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until they click into place. Reconnect the negative battery terminal.
- Final Steps: Some vehicles may require a security relearn or other specific procedures after installation. This can typically be done without special tools. Start the vehicle and check for proper operation and ensure the check engine light is off.
Verified Vehicle Compatibility
This module is a direct replacement for multiple part numbers, including 12692067, 12676230, 12662034, and others. It is guaranteed to fit the following GM models with the specified options. Please provide your VIN upon purchase to ensure we program it correctly for your exact vehicle.
- Cadillac ATS (2014-2016)
- Cadillac CTS (2014-2016)
- Cadillac Escalade / ESV (2015-2016)
- Cadillac XTS (2014-2016) – Specifically for the 3.6L LF3 engine.
- Chevrolet Camaro (2016) – 6.2L
- Chevrolet Colorado (2015-2016) – 3.6L
- Chevrolet Corvette (2014-2016)
- Chevrolet Silverado 1500 (2014-2016)
- Chevrolet Suburban (2015-2016)
- Chevrolet Tahoe (2015-2016)
- GMC Canyon (2015-2016) – 3.6L
- GMC Sierra 1500 / Denali 1500 (2014-2016)
- GMC Yukon / Yukon XL (2015-2016)
Choosing this pre-programmed 2014-2016 XTS Engine Control Module is the smartest way to solve complex engine management problems efficiently and get your vehicle performing as the factory intended.
Do I need to do any programming myself?
Do I need to do any programming myself?
No. This ECM comes fully programmed to your vehicle’s VIN with the latest GM software updates. It is ready for installation right out of the box, saving you a trip to the dealership.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive this information to program it correctly.
Is this a new or used part?
This is a high-quality, tested recycled OEM part that has been inspected for full functionality and then programmed specifically for your vehicle.
Will this fix my check engine light?
If your check engine light is caused by an internal failure of the ECM (common codes include P0601, P0606), then this part is the correct fix. It’s crucial to have your vehicle properly diagnosed to ensure the ECM is the root cause of the issue.
What if my part number is slightly different?
This module is compatible with a wide range of part numbers, including 12692067, 12676230, 12672537, and more. As long as your vehicle is on the compatibility list, we will program the module to function perfectly for your application.