Restore Peak Performance and Reliability to Your GM Vehicle
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a reliable vehicle into a source of constant frustration. If your Cadillac, Chevrolet, or GMC is suffering from perplexing issues like intermittent stalling, a persistent check engine light, or a complete no-start condition, the problem often traces back to this critical component. This isn’t just a part; it’s the brain of your engine, and when it falters, everything is affected. We’re offering a dependable and streamlined solution: a genuine GM Engine Control Module, part number 12704476, professionally programmed with the latest factory software specifically for your vehicle.
The Advantage of VIN-Specific Programming
Don’t settle for a generic, off-the-shelf computer that requires expensive and time-consuming programming at a dealership. We take the hassle out of the process. When you place your order, simply provide us with your vehicle’s 17-digit VIN. Our experts will then flash this 2017 XTS Engine Control Module with the precise calibration and software updates from GM that match your vehicle’s exact specifications. This ensures optimal engine performance, fuel efficiency, and emissions control, just as the manufacturer intended. It’s the most effective way to get your vehicle back to factory standards without the dealership price tag.
Case Study: A Tricky Diagnosis
I recall a 2017 Cadillac XTS with the 3.6L LF3 engine that came into the bay with a complaint of random power loss and a flurry of communication codes (U0100, U0101). The owner had already replaced the battery and checked all the main power and ground connections. On the surface, everything looked fine. However, after connecting my scan tool and monitoring live data, I noticed the ECM would intermittently drop offline. It wasn’t a consistent failure, making it difficult to pinpoint. Experience has taught me that these ‘ghost’ issues are often the hallmark of a failing processor within the ECM itself. We installed a VIN-programmed module just like this one, performed the security relearn, and the car ran perfectly. The customer was relieved to have a definitive fix after weeks of uncertainty.
Common Signs of a Failing Engine Computer
- ✔ Check Engine Light is illuminated with codes such as P0601, P0606, or other internal processor faults.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy and poor engine performance.
- ✔ Intermittent stalling or rough idling.
- ✔ Communication errors with other vehicle modules (TCM, BCM).
- ✔ Automatic transmission shifting issues or harsh engagement.
Your Straightforward Installation Path
Replacing your 2017 XTS Engine Control Module is a manageable job for a seasoned DIYer or any professional technician. While the physical swap is simple, please be aware of the necessary electronic procedures.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any work on the electrical system.
- Locate the ECM: On most listed models, the ECM is found in the engine compartment (typically on the driver’s side) or, on the Corvette, under the dash on the passenger side cowl. Refer to a service manual for your specific vehicle’s location.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that must be released. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount the new, pre-programmed ECM in the reverse order of removal. Ensure all bolts are secure and reconnect the wiring harnesses, making sure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (Required): This is a critical step. If the vehicle does not start, you or your mechanic MUST perform a Vehicle Theft Deterrent (VTD) relearn using a compatible scan tool with access to GM’s TIS2Web or Techline Connect system.
- Additional Relearns (As Needed): Depending on your vehicle, other procedures like a Crankshaft Position Variation Relearn may be necessary to clear certain codes and ensure perfect operation. This is the responsibility of the installer.
Will This Fit My Vehicle?
This module is a direct replacement for part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It is guaranteed to fit the following vehicles:
- 2017 Cadillac Escalade / Escalade ESV
- 2017 Cadillac XTS (3.6L, VIN 8, opt LF3)
- 2017 Cadillac CTS (6.2L Supercharged or 3.6L Twin Turbo VIN 8, opt LF3)
- 2017 Cadillac ATS (3.6L, VIN Y, opt LF4)
- 2017 Chevrolet Corvette
- 2017 Chevrolet Tahoe / Suburban 1500
- 2016-2018 Chevrolet Silverado 1500 Pickup (check specific IDs)
- 2017 GMC Yukon / Yukon XL 1500
- 2016-2018 GMC Sierra 1500 / Sierra Denali 1500 (check specific IDs)
Please verify your part number or contact us with your VIN to confirm compatibility before ordering.
Frequently Asked Questions
2017 XTS Engine Control Module
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the with the exact software and calibrations your specific vehicle requires for proper engine, transmission, and emissions system operation. This step is essential for a successful repair.