Is Your Cadillac XTS Running Rough? The ECM Might Be the Culprit.
If you’re experiencing frustrating issues like a persistent Check Engine Light, poor fuel economy, engine stalling, or shifting problems in your 2013-2016 Cadillac XTS, a failing Engine Control Module (ECM) is a very likely cause. The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifts and emissions systems. When it begins to fail, it can create a cascade of performance problems that can be difficult to diagnose and expensive to fix at a dealership.
This is a genuine, used GM Engine Control Module (interchangeable with part numbers 12653998, 12633555, 12655007, and 12644446) that offers a reliable and cost-effective solution. We take the guesswork and high cost out of the equation by pre-programming the module specifically to your vehicle’s Vehicle Identification Number (VIN). This means you receive a part that is ready for installation, loaded with the latest GM software updates for optimal performance and efficiency.
From the Diagnostic Bay
We had a 2014 Cadillac XTS come into the shop with a bizarre set of symptoms. The owner complained of intermittent stalling at red lights and a transmission that would sometimes refuse to shift out of second gear. No specific codes were being thrown, just a generic U-code for lost communication. We checked wiring harnesses and sensors for hours. Finally, we decided to monitor the live data from the ECM and noticed erratic voltage readings. We swapped in one of our VIN-programmed modules, performed the security relearn, and the car immediately ran like new. The original ECM had an internal fault that was causing havoc without setting a clear diagnostic trouble code—a classic sign of a failing computer.
Common Symptoms of a Failing GM ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine misfires, stumbling, or hesitation during acceleration.
- ✔ Unexplained drop in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle failing to start or stalling unexpectedly.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Other warning lights on the dashboard, like traction control or ABS.
The Importance of a VIN-Programmed 2013-2016 XTS ECM
Simply installing a used ECM from another vehicle will not work. Modern vehicle computers are locked to the specific VIN of the car they came from. Our service eliminates this critical barrier. By providing us with your VIN during checkout, you ensure that the replacement 2013-2016 XTS ECM you receive is a perfect match for your car’s specific options, engine calibration, and security system. This plug-and-play approach saves you from needing expensive dealer-specific tools or paying for costly programming services. We handle the complex part so you can focus on the straightforward installation.
Simple Installation Process
Once you receive your pre-programmed module, the installation is straightforward for a DIY mechanic or any professional technician. After physically swapping the module, you will need to perform a security relearn procedure (also known as a key relearn or anti-theft relearn). This procedure syncs the new ECM with your vehicle’s existing keys and can typically be done without any special tools. Instructions for this procedure are widely available online or in service manuals for your specific model.
Verified Fitment Across Multiple GM Models
While this is a perfect solution for the 2013-2016 XTS ECM, this versatile module also fits a wide range of other GM vehicles. Please verify your part number and check the list below to ensure compatibility:
- Acadia: 2013-2016
- ATS: 2013-2015 (2.0L, 2.5L)
- Camaro: 2013-2015 (3.6L)
- Caprice: 2014-2016 (3.6L)
- Captiva Sport: 2013-2015
- CTS: 2014-2015 (Sdn, 2.0L)
- Enclave: 2013-2016
- Equinox: 2013-2016
- Impala: 2014-2017 (2.5L, 3.6L)
- LaCrosse: 2013-2016
- Malibu: 2013-2016 (2.0L, 2.4L, 2.5L)
- Orlando: 2014
- Regal: 2013-2016 (2.0L, 2.4L)
- SRX: 2013-2016
- Terrain: 2013-2016
- Traverse: 2013-2016
- Verano: 2013-2016 (2.0L)
- XTS: 2013-2016 (3.6L)
Frequently Asked Questions
Do I need to send my old ECM to you?
No, there is no core charge or need to send us your original module. This is a direct purchase. We program a replacement unit from our tested stock and ship it directly to you.
What happens after I place my order?
After you purchase the ECM, you must provide us with your 17-digit VIN. You can add it to the notes section at checkout or send it to us in a message. We cannot program and ship the module without your vehicle’s specific VIN.
Is any additional programming required after installation?
The module arrives fully programmed for your engine and transmission. However, you will need to perform a security relearn procedure to sync the module with your vehicle’s anti-theft system and keys. This procedure typically takes 10-30 minutes and does not require a scan tool.
Are these new modules?
No, this is a quality used ECM that has been sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure full functionality before being programmed and shipped.
What if my part number isn’t an exact match?
This listing covers part numbers 12653998, 12633555, 12655007, and 12644446. These are interchangeable. As long as your vehicle is on the compatibility list, we will program the correct software for your VIN.