Is Your GM Vehicle Running Rough, Stalling, or Showing a Check Engine Light?
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can bring an otherwise perfect vehicle to a standstill. If your 2017 Cadillac CTS, or another compatible GM model, is suffering from inconsistent performance, poor fuel economy, or frustrating no-start conditions, the ECM is a primary suspect. This isn’t just a part; it’s the brain of your engine, and when it falters, everything is affected.
“A customer’s 2017 CTS-V came in last week with a persistent P0606 code (ECM Processor Fault) and intermittent power loss under load. After verifying all power and ground circuits to the module were solidโa critical first stepโwe confirmed the internal processor was failing. Replacing the ECM with a correctly programmed unit like this one resolved all the issues and restored that supercharged 6.2L engine’s performance instantly.”
The Smart Solution: A VIN-Programmed Replacement
Don’t settle for a generic, unprogrammed module that will require an expensive trip to the dealership. We take the guesswork and hassle out of the equation. This genuine GM Engine Control Module is a direct-fit replacement, but with one crucial advantage: we program it specifically for your vehicle before it ships.
- โ VIN-Specific Programming: Simply provide your Vehicle Identification Number (VIN) at checkout, and we’ll flash the module with the latest, most stable GM-certified software for your exact vehicle configuration.
- โ Restores Original Performance: A correctly functioning ECM is essential for managing fuel delivery, ignition timing, emissions systems, and transmission shifting. This part restores that critical functionality.
- โ Solves Common Failure Symptoms: Effectively addresses issues like random stalling, hesitation, multiple unrelated trouble codes, and complete no-start situations caused by a faulty computer.
- โ Direct-Fit Replacement: Guaranteed to fit and function correctly in the vehicles listed below, matching part number 12678815 and other interchanges.
Understanding the Post-Installation Process
To maintain your vehicle’s security, modern GM vehicles require a ‘handshake’ between the new ECM and the security system. This is an industry-standard procedure.
IMPORTANT: Upon installing this module, you or your mechanic will need to perform a Vehicle Theft Deterrent System Relearn. This procedure requires a professional scan tool with access to GM’s Tis2web or Techline Connect software. This is not optional; your vehicle will not start until this relearn is completed. Other vehicle-specific setups, such as a crankshaft position variation relearn or fuel injector flow rate programming, may also be necessary depending on your model.
Expert Pro Tip: Don’t Skip the Basics
Before installing your new ECM, take five minutes to clean the main harness connector terminals with a dedicated electronics cleaner. Over the years, I’ve seen countless communication errors caused by subtle corrosion or oxidation on the pins. A clean connection ensures the new module can communicate flawlessly with all other vehicle systems from the moment it’s plugged in.
Guaranteed Fitment for Your Vehicle
This module is a direct replacement for the following part numbers:
12678815, 12692068, 12704476, 12686382, 12674052, 12674472
It is confirmed to fit the following makes and models:
- Cadillac ATS (2017): 3.6L, VIN Y (LF4)
- Cadillac CTS (2017): 3.6L Twin Turbo, VIN 8 (LF3) | 6.2L Supercharged
- 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)