Is Your Cadillac XTS Running Rough? It Could Be The ECM.
If your 2017 Cadillac XTS, or another compatible GM vehicle, is experiencing baffling issues like intermittent stalling, poor acceleration, a persistent check engine light, or even a no-start condition, the root cause is often the Engine Control Module (ECM). As the central computer of your vehicle, the ECM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions. When it begins to fail, it can create a cascade of problems that are frustrating and difficult to diagnose. Don’t let a faulty computer keep your vehicle off the road. This is the direct-fit, correctly programmed solution you need.
We had a 2017 Escalade come in on a tow truck. The customer said it would run fine for a few days, then suddenly stall at a stoplight and refuse to restart for an hour. They had already replaced the battery and alternator. We scanned the vehicle and found a P0606 code (ECM/PCM Processor Fault) along with a handful of communication errors. After verifying the power and ground circuits to the module were solid, we knew the internal processor of the original ECM was failing. We installed one of our VIN-programmed modules, performed the security relearn, and the Escalade was back to running with the reliability its owner expected. It’s a classic case of the vehicle’s brain needing a transplant.
Your Direct-Fit 2017 XTS Engine Module Solution
This isn’t just a generic, off-the-shelf part. This is a genuine GM Engine Control Module, part number 12704476, that is professionally programmed specifically for your vehicle. Before we ship it, we use your Vehicle Identification Number (VIN) to flash the module with the latest, most stable software updates directly from General Motors. This critical step ensures that the ECM communicates perfectly with all other systems in your vehicle, restoring factory performance and efficiency. By providing a module programmed to your exact vehicle, we eliminate the need for expensive dealership programming and get you one step closer to a finished repair.
Is Your Vehicle’s Brain Failing? Common ECM Symptoms
- ✔ Persistent Check Engine Light (CEL) with codes related to processor faults (e.g., P0601, P0606) or communication errors.
- ✔ Unexplained engine stalling or hesitation, especially when warm.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough idling or engine misfires.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle cranks but refuses to start.
- ✔ Issues with other electronic systems, such as cruise control or traction control.
Installation and Required Procedures
Once you receive your pre-programmed 2017 XTS Engine Module, the physical installation is straightforward. However, for the vehicle to start and run, a critical security handshake procedure must be completed. This is known as the Vehicle Theft Deterrent (VTD) relearn. This procedure pairs the new ECM to your vehicle’s existing security system.
IMPORTANT: This VTD relearn, along with any other necessary adaptations like a crankshaft position variation relearn or injector flow rate programming, is the responsibility of the installer. These procedures require a professional scan tool with GM programming capabilities, such as the GM MDI with a subscription to Tis2web/Techline Connect. This is a standard final step for this type of repair in any professional shop.
Guaranteed Fitment & Part Number Compatibility
This module is a direct replacement for the following part numbers: 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It is confirmed to fit the following vehicles:
- 2017 Cadillac Escalade & Escalade ESV
- 2017 Cadillac XTS (3.6L Twin Turbo, VIN 8, opt LF3)
- 2017 Chevrolet Tahoe & Suburban 1500
- 2017 GMC Yukon & Yukon XL 1500
- 2017 Cadillac CTS (6.2L Supercharged or 3.6L Twin Turbo)
- 2017 Chevrolet Corvette
- 2017 Cadillac ATS (3.6L, VIN Y, opt LF4)
- 2016-2018 Chevrolet Silverado 1500 (check ID)
- 2016-2018 GMC Sierra 1500 & Sierra Denali 1500 (check ID)
Please verify your part number or contact us with your VIN to ensure perfect compatibility before ordering.
Frequently Asked Questions
Do I need to get this ECM programmed?
No. We handle the main programming for you. Before shipping, we flash the module with the latest GM software using the VIN you provide. This ensures it matches your vehicle’s specific configuration.
What is a ‘theft relearn’ and why is it necessary?
The theft relearn, or Vehicle Theft Deterrent (VTD) relearn, is a security procedure that syncs the new ECM with your vehicle’s immobilizer system. Without this step, the vehicle will not start because it will think it is being stolen. This must be done on-vehicle after installation.
Can I perform the theft relearn myself?
Performing the theft relearn and other procedures like the crankshaft variation relearn requires a professional-grade diagnostic tool with access to GM’s software (like Tis2web/Techline Connect). It is not possible with basic code readers and is typically performed by a qualified technician.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot program and ship your part until we receive this information.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. It is crucial to have a proper diagnosis to confirm the ECM is the point of failure before ordering.