Is Your Cadillac XTS Running Rough? The ECM Might Be the Culprit.
If you’re dealing with a persistent check engine light, poor fuel mileage, or frustrating performance issues in your 2017-2019 Cadillac XTS, the Engine Control Module (ECM) is a likely suspect. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing ECM can cause a cascade of problems that are often misdiagnosed. This isn’t just a part; it’s the brain of your engine, and when it falters, your vehicle’s performance, reliability, and efficiency suffer.
This replacement ECM, part number 12667189, is the definitive solution. We take the guesswork and high cost out of the repair by programming the module specifically for your vehicle using your VIN. This ensures it arrives with the latest GM factory software updates, ready for a straightforward installation.
Common Symptoms of a Failing GM ECM:
- โ Persistent Check Engine Light (CEL) with various communication or sensor codes.
- โ Unexplained drops in fuel economy.
- โ Engine stalling, stumbling, or hesitating during acceleration.
- โ Rough or erratic idling.
- โ Transmission shifting issues or harsh shifts.
- โ Complete no-start condition where the engine cranks but won’t fire.
Expert Pro Tip: Protect Your New Module
Before installing your new ECM, take 10 minutes to check for the root cause of the original failure. A common killer of these modules is a shorted sensor or actuator on the 5-volt reference circuit. Use a multimeter to check for shorts to ground on the 5V reference wire at key sensors like the throttle body, MAP sensor, or accelerator pedal position sensor. A short here can send excessive voltage back to the computer, damaging the new unit instantly. Fixing a shorted sensor first can save you from a repeat failure.
Why Choose Our Pre-Programmed 2017-2019 XTS ECM?
The biggest hurdle with ECM replacement has always been the mandatory, and expensive, trip to the dealership for programming. We eliminate that step entirely. By providing us with your Vehicle Identification Number (VIN) during checkout, you receive a module that is truly plug-and-play. It’s programmed to match your car’s specific configuration, options, and emissions standards, just as a dealer would do, but at a fraction of the cost and hassle.
Plug-and-Play Installation: No Dealer Visit Required
While the exact location can vary, this ECM is typically found in the engine bay. For many compatible models like the Traverse or Acadia, it’s located behind the fan shroud. For others like the Regal or Equinox, it’s in the LH (driver’s side) engine compartment. Always consult a service manual for your specific model’s location.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the ECM: Find the old module in your engine bay. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully release the locking tabs on the electrical connectors and pull them straight out. Then, unbolt the module from its mounting bracket.
- Install the New ECM: Mount the new module in place and securely fasten the bolts. Reconnect the electrical connectors, ensuring they click firmly into place.
- Reconnect Power: Re-attach the negative battery terminal. The vehicle may need to complete a security relearn procedure, which typically involves cycling the key. Your vehicle’s service manual will have the specific instructions if needed.
Guaranteed Compatibility
This Engine Control Module is a direct replacement for part numbers 12667002, 12666070, and 12667189. It is guaranteed to fit and function correctly in the following vehicles:
- 2017-2019 Cadillac XTS (3.6L, VIN 3 – 8th digit, opt LFX)
- 2017-2019 Chevrolet Impala
- 2017 Chevrolet Caprice (3.6L)
- 2017 Chevrolet Traverse (behind fan shroud)
- 2017 Chevrolet Equinox (LH engine compartment)
- 2017 GMC Acadia (VIN J – 11th digit, Limited), (behind fan shroud)
- 2017 GMC Terrain (LH engine compartment)
- 2017 Buick Enclave (behind fan shroud)
- 2017 Buick Regal (LH engine compartment)
- 2017 Buick Verano
Don’t let a faulty computer keep your car off the road. Order this pre-programmed 2017-2019 XTS ECM today and restore the smooth, reliable performance you expect from your vehicle.