Is Your Cadillac or GM Vehicle Running Erratically?
If you’re dealing with a frustrating no-start condition, intermittent stalling, poor fuel economy, or a persistent check engine light on your 2017 Cadillac CTS, the engine control module (ECM) is a primary suspect. As the central computer for your engine, a failing ECM can cause a cascade of confusing and debilitating issues. I’ve seen it countless times in my shop: a high-performance machine like a supercharged CTS or a workhorse Silverado brought to a standstill by a faulty module. This isn’t just an inconvenience; it’s a critical failure that needs a reliable solution.
The Direct-Fit Solution: A 2017 CTS Engine Control Module Programmed for You
Forget the hassle and expense of a dealership visit for programming. This Engine Control Module, part number 12674472, is the answer. Before we ship it, our technicians will professionally flash the unit with the latest official GM calibrations specific to your vehicle’s VIN. This ensures that when it arrives, it’s ready to communicate with the other systems in your car, restoring the precise control over fuel delivery, ignition timing, and emissions it was designed for.
Real-World Diagnostics: A Technician’s Experience
“A customer’s 2017 Sierra 1500 came in last month with a no-start condition that had two other shops stumped. They had already replaced the battery and starter. The diagnostic codes were all over the place, pointing to communication errors. Before condemning the ECM, I performed a simple but crucial check: a ‘wiggle test’ on the main ECM harness. Sure enough, wiggling the connector caused the dash lights to flicker. A pin inside the connector had backed out just enough to lose contact intermittently. We repinned the connector, and the truck fired right up. It’s a 15-minute check that can save you from buying a part you don’t need.”
Common Symptoms of a Failing ECM:
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling, especially when warm or at idle.
- ✔ Drastic decrease in fuel mileage.
- ✔ Check Engine Light (CEL) is on with multiple communication or sensor codes.
- ✔ Noticeable loss of power and poor acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
Installation and Relearn Procedure Notice
While we handle the complex VIN programming, installation requires a few final steps on your end. This is standard procedure for modern vehicle electronics to ensure security and proper system integration.
- Safety First: Always disconnect the negative battery terminal before beginning any work on your vehicle’s electrical system.
- Locate and Replace: The ECM location varies by model (see fitment list below). Carefully disconnect the wiring harnesses and remove the old module. Install the new module and securely reconnect the harnesses.
- Reconnect Battery: Once the new ECM is installed, reconnect the negative battery terminal.
- Security Relearn (If Necessary): Attempt to start the vehicle. If it does not start, a Vehicle Theft Deterrent (VTD) relearn is required. This procedure syncs the new ECM with your vehicle’s anti-theft system. This must be performed using a GM-compliant scan tool or software like Tis2web/Techline Connect.
- Additional Setups: Depending on your vehicle, other procedures like a Crankshaft Variation Relearn or injector flow rate programming may be necessary to achieve optimal performance. These are the responsibility of the installer.
Guaranteed Compatibility
This module is a direct replacement for several GM part numbers, ensuring wide-ranging compatibility. If your original module has one of the following numbers, this part will fit: 12692068, 12704476, 12686382, 12674052, 12674472, or 12678815.
This part is confirmed to fit the following vehicles and options:
- Cadillac ATS (2017): 3.6L, VIN Y (LF4)
- Cadillac CTS (2017): 6.2L (Supercharged) or 3.6L, VIN 8 (LF3 Twin Turbo)
- Cadillac Escalade / ESV (2017)
- Cadillac XTS (2017): 3.6L, VIN 8 (LF3)
- Chevrolet Corvette (2017)
- Chevrolet Silverado 1500 (2016-2018)
- Chevrolet Suburban 1500 (2017)
- Chevrolet Tahoe (2017)
- GMC Sierra 1500 / Denali 1500 (2016-2018)
- GMC Yukon / Yukon XL 1500 (2017)
Please provide your VIN upon checkout to ensure we can program the module correctly before shipment. Restore your vehicle’s performance and reliability today.