Restore Your Cadillac’s Core Performance and Reliability
Is your 2014-2016 Cadillac XTS suffering from frustrating and unpredictable issues like stalling, erratic shifting, a persistent check engine light, or even a no-start condition? The Engine Control Module (ECM) is the central computer of your vehicle, managing everything from fuel delivery and ignition timing to transmission function. When it begins to fail, it can cause a wide range of problems that are often difficult to diagnose. This isn’t just an inconvenience; it’s a critical component for your car’s performance and safety.
We offer a straightforward, reliable solution. This is a genuine GM Engine Control Module, part number 12672963, that arrives at your door fully programmed to your vehicle’s specific VIN. We load the latest, most stable software updates from GM, ensuring optimal performance and resolving many issues that older software versions may have had. By providing your VIN at checkout, you eliminate the need for an expensive trip to the dealership for programming. This is a direct-fit, plug-and-play solution designed to get your luxury sedan back on the road quickly and affordably.
Case Study: A Tricky Diagnosis
I remember a 2015 Cadillac XTS that came into my shop with a very intermittent no-start condition. The owner was frustrated because it would work perfectly for days, then refuse to crank. There were no consistent check engine light codes, but a deep scan showed a history of U0100 (Lost Communication With ECM) faults. We checked the usual suspects—battery, grounds, and wiring harnesses—and found nothing wrong. On a hunch, we monitored the ECM’s internal temperature data. We discovered that on hotter days, the module’s internal processor was faulting. Swapping in a VIN-programmed ECM like this one solved the problem instantly. The owner was thrilled to have his car back without the guesswork and high cost of dealership diagnostics.
Common Signs of a Failing Engine Module
If the brain of your vehicle is failing, you’ll notice. A faulty ECM can mimic many other problems, but if you’re experiencing several of these symptoms, your module is a likely culprit. Look out for:
- ✔ Check Engine Light is on with codes like P0601, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Stalling or rough idling, especially when the engine is warm.
- ✔ Noticeable decrease in fuel economy.
- ✔ The transmission shifts harshly or at the wrong times.
- ✔ Misfires or poor engine performance.
- ✔ Communication issues with diagnostic scan tools.
A Straightforward Guide to Installation
Installing your new 2014-2016 XTS Engine Module is a manageable job for a confident DIYer or any professional technician. Since we handle the programming, no special computer equipment is required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning work.
- Locate the ECM: On the Cadillac XTS and similar sedans (like the ATS/CTS), the ECM is typically found in the engine bay, often on the driver’s side (LH) near the firewall or shock tower. It’s a metal box with several large electrical connectors.
- Disconnect and Remove: Carefully unclip and remove the electrical connectors. Note their orientation. Then, unbolt the mounting hardware holding the old module in place and remove it from the vehicle.
- Install the New Module: Mount the new ECM in the same location and secure it with the original hardware. Reconnect the electrical connectors, ensuring they click firmly into place.
- Final Steps: Reconnect the negative battery terminal. Your vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for specific instructions. Start the engine and verify the check engine light is off.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM vehicles. Please verify your vehicle is on this list and that your original part number is one of the compatible numbers listed below. The specific fitment for the Cadillac XTS is: 2014-2016 XTS with the 3.6L engine (VIN 8, 8th digit, opt LF3).
Compatible Part Numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, 12669318
CAMARO: 2016 (6.2L)
CANYON / COLORADO: 2015-2016 (3.6L)
CORVETTE: 2014-2016
CTS: 2014-2016 (3.6L, 6.2L)
ESCALADE / ESV: 2015-2016
SIERRA / SILVERADO 1500: 2014-2016
SUBURBAN 1500: 2015-2016
TAHOE: 2015-2016
XTS: 2014-2016 (3.6L)
YUKON / YUKON XL 1500: 2015-2016
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming or flashing myself?
No. This module comes fully programmed for your specific vehicle using the VIN you provide. This makes it a true plug-and-play installation, saving you a trip to the dealer.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.
What if my original part number isn’t 12672963?
That’s okay. This module is a direct replacement for all part numbers listed in the compatibility section. As long as your number is on that list, this part will work perfectly.
Is this a difficult part to replace for a DIYer?
For most of the listed vehicles, this is a very accessible part in the engine bay. If you are comfortable disconnecting a battery and using basic hand tools, this is a very manageable job. The key benefit is that the difficult software part is already done for you.
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 yes, this part will resolve the issue. It’s always best to have your vehicle scanned to confirm the fault codes before ordering.
How does the VIN programming process work?
After you place your order, you will need to provide us with your vehicle’s VIN. Our technicians use this number to access the correct GM software and flash it onto the module before it is shipped to you.