2018 Cadillac XTS ECM Engine Control Module 12704475 Programmed

Restore Your Vehicle’s Performance!

Get your GM vehicle back on the road with this direct-fit Engine Control Module (12704475). It comes pre-programmed to your vehicle’s VIN with the latest GM software, saving you a trip to the dealer. A theft relearn procedure is required upon installation. Order today to fix your engine issues!

$299.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-10246-76 Categories: ,
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Is Your GM Vehicle Running Rough? The ECM Might Be the Culprit.

If you’re experiencing baffling engine issues with your 2018 Cadillac XTS, Corvette, Silverado, or other compatible GM vehicle, you understand the frustration. Intermittent stalling, poor fuel economy, a persistent Check Engine Light, and a general lack of performance can make driving a stressful experience. These are classic signs of a failing Engine Control Module (ECM), the central computer responsible for managing your engine’s performance, emissions, and efficiency. When it falters, the entire vehicle suffers. This isn’t just an inconvenience; it’s a critical failure that needs a reliable solution.

This listing is for a direct-fit replacement Engine Control Module, part number 12704475. We take the guesswork and high cost out of the equation by pre-programming the module specifically for your vehicle using your VIN. This ensures it arrives with the latest, most stable software updates directly from GM, ready for installation and the final security relearn procedure. Stop chasing symptoms and address the root cause with a dependable, correctly programmed ECM.

Common Symptoms of a Failing GM ECM

  • ✔ Check Engine Light: The most obvious sign, often with codes related to sensors, misfires, or internal processor errors.
  • ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire, especially under load.
  • ✔ No-Start Condition: In severe cases, a complete ECM failure will prevent the engine from starting at all.
  • ✔ Poor Fuel Economy: An improperly functioning ECM can’t optimize the air-fuel mixture, leading to a noticeable drop in MPG.
  • ✔ Reduced Engine Power: Your vehicle may feel sluggish, hesitate during acceleration, or go into a reduced power “limp mode.”
  • ✔ Transmission Shifting Issues: The ECM communicates with the transmission controller, and a fault can cause harsh or erratic shifting.
From the Diagnostic Bay

We had a 2018 Sierra 1500 come in with a problem that was driving the owner crazy. The truck would randomly stall at red lights, but never threw a consistent code. The local shop had replaced the throttle body and a few sensors, but the issue persisted. After hooking up our diagnostic tools and monitoring live data, we noticed the ECM’s voltage reference was dropping out intermittently. It was a subtle fault that only a deep dive could find. We installed a VIN-programmed ECM, performed the security and crankshaft variation relearns, and the truck ran perfectly. The customer was thrilled to finally have his reliable truck back without the dealership price tag.

The Smart Solution: A VIN-Programmed 2018 XTS ECM

Why choose our pre-programmed module? The alternative is buying a blank module and paying dealership labor rates for programming, which can be time-consuming and expensive. Our service streamlines the process. By providing us with your vehicle’s VIN at checkout, you receive a unit that is loaded with the correct factory calibrations for your specific make, model, and options. This is the most efficient way to restore your vehicle’s factory performance and reliability.

This module is a direct replacement for several part numbers, including: 12704475, 12692069, 12680656, 12686383, and 12688528. Please verify your part number before ordering to ensure compatibility.

Installation and Required Procedures

While the physical installation is straightforward for a competent DIYer or any professional technician, it’s crucial to understand the electronic setup required post-installation. Because the ECM is a core part of your vehicle’s anti-theft system, a Vehicle Theft Deterrent (VTD) relearn is mandatory. If this procedure is not performed, the vehicle will not start.

NOTICE: The VTD relearn must be performed using a professional GM diagnostic tool with access to Tis2web or Techline Connect. This is the responsibility of the installer. Additionally, other vehicle-specific procedures, such as a crankshaft variation relearn or injector flow rate programming, may be necessary depending on your exact model. We provide the correctly programmed computer; the final on-vehicle setup procedures are the buyer’s responsibility.

Complete Vehicle Fitment List

This Engine Control Module fits a wide range of GM vehicles. Please confirm your model and options below:

  • Cadillac Escalade / ESV: 2018
  • Cadillac XTS: 2018 (3.6L, VIN 8 – opt LF3)
  • Chevrolet Corvette: 2018-2019 (VIN 6 – opt LT4, VIN 7 – opt LT1)
  • Chevrolet Express 2500/3500 Van: 2018 (4.3L)
  • Chevrolet Silverado 1500: 2018 (ID 12680656)
  • Chevrolet Suburban 1500: 2018
  • Chevrolet Tahoe: 2018
  • GMC Savana 2500/3500 Van: 2018 (4.3L)
  • GMC Sierra 1500: 2018 (ID 12680656)
  • GMC Sierra Denali 1500: 2018 (ID 12686383)
  • GMC Yukon / Yukon XL 1500: 2018

Frequently Asked Questions

What is an ECM and what does it do?

The Engine Control Module (ECM) is your vehicle’s main computer. It controls critical functions like fuel injection, ignition timing, emissions systems, and idle speed to ensure the engine runs efficiently and powerfully.

Is this ECM ready to install out of the box?

This ECM is pre-programmed to your vehicle’s VIN. However, it is not fully plug-and-play. After physical installation, you MUST perform a Vehicle Theft Deterrent (VTD) relearn with a proper GM scan tool for the vehicle to start. Other relearns may also be required.

What is a VIN and why do you need it for programming?

The VIN (Vehicle Identification Number) is a unique 17-digit code for your car. It allows us to access the exact factory software and calibrations for your specific engine, transmission, and options, ensuring the ECM works perfectly.

What is the ‘theft relearn’ and can I do it myself?

The theft relearn procedure syncs the new ECM with your vehicle’s security system and keys. It requires a professional-grade diagnostic tool with a subscription to GM’s software (Tis2web/Techline Connect). It is not a procedure that can be done without the proper equipment.

Will this fix my Check Engine Light?

If the Check Engine Light is caused by an internal failure of your old ECM, then yes, this part will resolve the issue. However, it’s essential to properly diagnose the vehicle first, as the light could be on for other reasons, like a faulty sensor.

Year
Genuine OEM

Yes

Interchange part number

Condition

Seller refurbished

Year

2018

Model

XTS

Make

Brand

GM

MPN

12704475

Manufacturer Part Number

, , , ,

Manufacturer Warranty

1 Year

Hardware Type

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