Is Your Cadillac XTS Running Rough or Refusing to Start?
As a technician with over two decades of experience under the hood, I’ve seen countless vehicles sidelined by a faulty Engine Control Module (ECM). For your 2017 Cadillac XTS, symptoms like an illuminated Check Engine Light, erratic engine behavior, poor fuel economy, or a complete no-start condition often point directly to the vehicle’s computer. The ECM is the brain of your engine, and when it fails, it can cause a cascade of frustrating and confusing problems. You’re not just buying a part; you’re restoring your vehicle’s core functionality and peace of mind.
The Smart Solution: A VIN-Programmed 2017 XTS Engine Control Module
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership. We provide a direct-fit ECM, part number 12704476, that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures that the module arrives loaded with the latest factory software updates from GM, tailored precisely for your XTS’s engine and options. This process corrects software bugs and improves performance, something a simple part swap can’t do.
Expert Pro Tip: Check This Before You Order
In my shop, I’ve seen customers spend hundreds on an ECM when the real culprit was a simple, corroded ground wire. Before replacing your module, locate the main engine-to-chassis ground strap. It’s a thick, often braided, wire connecting the engine block to the vehicle’s frame. Disconnect it, clean both contact points with a wire brush until they are shiny, and re-secure it tightly. A poor ground can cause low voltage issues that mimic complete ECM failure. This five-minute check can save you time and money.
Common Symptoms of a Failing ECM:
- โ Persistent Check Engine Light (CEL) that won’t clear
- โ Vehicle enters limp mode with reduced power
- โ Unexplained stalling or rough idling
- โ No communication with diagnostic scan tools
- โ Transmission shifting issues or harsh engagement
- โ Decreased fuel efficiency
- โ Complete no-start or intermittent starting problems
Installation & Post-Installation Requirements
Installing your new ECM is straightforward. However, due to modern vehicle security systems, a final step may be required. This is an industry-standard procedure for most modern GM vehicles.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: On the 2017 XTS with the 3.6L LF3 engine, the ECM is typically located in the engine compartment.
- Swap the Module: Carefully unplug the wiring harnesses from the old module and remove it. Install the new module and securely reconnect the harnesses.
- Reconnect Battery: Re-attach the negative battery terminal.
- Theft System Relearn: Attempt to start the vehicle. If it starts and runs normally, no further action is needed. If the vehicle does not start, a Vehicle Theft Deterrent System relearn is necessary. This procedure syncs the new ECM with your vehicle’s security system and must be performed using a professional GM tool like Tis2web or Techline Connect.
Please Note: The buyer is responsible for performing the theft relearn and any other necessary setup procedures, such as a crankshaft position variation relearn or injector flow rate programming if required by your specific vehicle’s service manual. This is standard practice for any professional ECM replacement.
Guaranteed Compatibility for Your GM Vehicle
This module is a direct replacement for several part numbers, ensuring wide compatibility. It will fit if your original module has one of the following numbers:
Interchangeable Part Numbers: 12692068, 12704476, 12686382, 12674052, 12674472, 12678815
This part is confirmed to fit the following vehicles (and more):
- 2017 Cadillac XTS (3.6L, VIN 8, opt LF3)
- 2017 Cadillac ATS (3.6L, VIN Y, opt LF4)
- 2017 Cadillac CTS (6.2L Supercharged or 3.6L Twin Turbo)
- 2017 Cadillac Escalade / ESV
- 2017 Chevrolet Corvette
- 2017 Chevrolet Tahoe / Suburban 1500
- 2016-2018 Chevrolet Silverado 1500 Pickup (check ID)
- 2017 GMC Yukon / Yukon XL 1500
- 2016-2018 GMC Sierra 1500 / Denali 1500 (check ID)