Programmed 2018 XTS ECM 12704475 | Engine Control Module Flashed to Your VIN

If you’re dealing with frustrating engine problems in your 2018 Cadillac XTS—like a persistent check engine light, rough idling, or even a no-start condition—a failing Engine Control Module (ECM) is often the culprit. As the central computer for your engine, the ECM governs everything from fuel delivery to spark timing. When it falters, the entire vehicle’s performance and reliability are compromised. This isn’t just an inconvenience; it’s a critical failure that needs a reliable solution.

This isn’t just a part; it’s a complete, ready-to-install solution. We are offering a genuine GM Engine Control Module, part number 12704475, that comes professionally programmed to your vehicle’s specific VIN. We flash it with the latest, most stable software updates directly from GM. This critical step ensures that the module communicates flawlessly with your vehicle’s other systems right out of the box, saving you a costly trip to the dealership for programming. Simply provide us with your VIN after purchase, and we’ll handle the complex part for you.

Is Your Vehicle Showing These ECM Failure Symptoms?

• ✔ Persistent Check Engine Light (CEL) that won’t go away.
• ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0606, or P060A.
• ✔ Communication loss codes like U0100 (Lost Communication with ECM/PCM).
• ✔ Unexplained drop in fuel economy or engine performance.
• ✔ Engine stalling, misfiring, or running rough for no apparent reason.
• ✔ The vehicle cranks but refuses to start.
• ✔ Transmission shifting issues or harsh gear changes.

A Straightforward Guide to Installation

1. ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
2. ✔ Locate the ECM: On most compatible vehicles, the ECM is found in the engine compartment, often on the driver’s side near the fuse box or firewall. For the Corvette, it’s located under the dash on the passenger side. Refer to a service manual for your specific model if you’re unsure.
3. ✔ Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old ECM from its mounting bracket and remove it.
4. ✔ Install the New Module: Bolt your new, pre-programmed ECM into place. Reconnect the wiring harnesses, making sure they click securely into place.
5. ✔ Reconnect Battery: Reattach the negative battery terminal.
6. ✔ Final Procedures (IMPORTANT): Attempt to start the vehicle. If it does not start, a Vehicle Theft Deterrent System (VTDS) relearn is required. This must be performed by a technician with access to GM’s TIS2WEB or Techline Connect software. Additionally, other procedures like a Crankshaft Variation Relearn may be necessary to ensure optimal performance and clear any related trouble codes. This is the responsibility of the installer.

Verified Vehicle Compatibility

This module, part number 12704475, is a direct replacement for part numbers 12692069, 12680656, 12686383, and 12688528. It is guaranteed to fit the following vehicles with the specified options:

• 2018 Cadillac XTS: Electronic Control Module; (3.6L), VIN 8 (8th digit, opt LF3)
• 2018-2019 Chevrolet Corvette: Electronic Control Module; (RH cowl under dash)
• 2018 Chevrolet Silverado 1500 Pickup: Electronic Control Module; (LH front engine compartment), ID 12680656
• 2018 GMC Sierra 1500 Pickup: Electronic Control Module; (LH front engine compartment), ID 12680656
• 2018 GMC Sierra Denali 1500: Electronic Control Module; (LH front engine compartment), ID 12686383
• 2018 Chevrolet Express 2500/3500 Van: Electronic Control Module; (LH rear engine compartment), 4.3L
• 2018 GMC Savana 2500/3500 Van: Electronic Control Module; (LH rear engine compartment), 4.3L
• 2018 Cadillac Escalade & Escalade ESV: Electronic Control Module; (engine compartment)
• 2018 Chevrolet Suburban 1500: Electronic Control Module; (LH front engine compartment)
• 2018 Chevrolet Tahoe: Electronic Control Module; (LH front engine compartment)
• 2018 GMC Yukon & Yukon XL 1500: Electronic Control Module; (LH front engine compartment)

Your Plug-and-Play Solution for a Healthy Engine

Don’t let a faulty computer keep your vehicle off the road. By ordering this pre-programmed 2018 XTS ECM, you are choosing a reliable, efficient, and cost-effective repair. We take the guesswork out of the equation by handling the programming, so you can focus on the simple installation. Restore your vehicle’s performance and peace of mind today.