Restore Peak Performance to Your GM Truck or SUV
Is your Silverado, Sierra, or other GM vehicle suffering from frustrating issues like stalling, a persistent Check Engine Light, poor fuel mileage, or a no-start condition? The Engine Control Module (ECM) is the brain of your vehicle’s powertrain, and when it fails, it can cause a wide range of problems that are often difficult to diagnose. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. As a technician with over two decades of experience, I’ve seen firsthand how a failing ECM can mimic dozens of other component failures. Replacing it with a generic, unprogrammed unit from a big-box store often creates more problems than it solves.
We offer a dependable solution. This genuine OEM-spec Engine Control Module is meticulously programmed with the latest GM factory software updates, tailored specifically to your vehicle’s VIN. This critical step ensures all systems communicate correctly, restoring the precise fuel delivery, ignition timing, and transmission shifting your vehicle was designed for. By providing us with your VIN at checkout, you receive a module that is ready for the final, on-vehicle relearn procedures, saving you a costly and time-consuming trip to the dealership for initial programming. Get the right part, programmed correctly, and get your truck back to being the reliable workhorse you depend on.
A Technician’s Notebook
I remember a 2017 Sierra 1500 that came into the bay with a complaint of intermittent stalling at stoplights and a random P0606 (ECM/PCM Processor Fault) code. The owner had already replaced the throttle body and a few sensors with no luck. The symptoms were inconsistent, making it a diagnostic headache. After verifying power and grounds to the ECM were solid, experience told me the internal processor was likely failing under specific thermal conditions. We installed one of our VIN-programmed modules, performed the security and crank variation relearn, and the truck ran flawlessly. It’s a classic case where shotgunning parts costs more time and money than addressing the core issue: the vehicle’s central computer.
Is Your Truck Showing These Signs of ECM Failure?
- ✔ Check Engine Light is on with communication codes (e.g., U0100) or internal processor fault codes (P0601, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Rough or erratic engine idling and stalling.
- ✔ The transmission shifts harshly or at the wrong times.
- ✔ Noticeable loss of power and poor acceleration.
- ✔ Other modules on the vehicle report a loss of communication with the ECM.
Your Straightforward ECM Installation Guide
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the ECM: On most 2016-2018 Silverado/Sierra trucks, the ECM is located in the engine compartment on the driver’s side, near the air filter housing.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that must be released. Once disconnected, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical connectors, ensuring they click securely into position.
- ✔ Reconnect Battery: Reattach the negative battery terminal.
- ✔ Perform Relearn Procedures: This is a critical final step. The vehicle will likely not start until a Security/Theft Deterrent Relearn is completed using a GM-compatible scan tool with access to TIS2Web or Techline Connect. Other procedures like the Crankshaft Position Variation Relearn may also be required for optimal performance. This is the responsibility of the installer.
Verified Vehicle Compatibility List
This module is a direct replacement for part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It is confirmed to fit the following vehicles:
- 2016-2018 Chevrolet Silverado 1500
- 2016-2018 GMC Sierra 1500 / Sierra Denali 1500
- 2017 Cadillac Escalade / Escalade ESV
- 2017 Chevrolet Tahoe / Suburban 1500
- 2017 GMC Yukon / Yukon XL 1500
- 2017 Cadillac ATS (3.6L, VIN Y, opt LF4)
- 2017 Cadillac CTS (6.2L Supercharged or 3.6L Twin Turbo, VIN 8, opt LF3)
- 2017 Cadillac XTS (3.6L, VIN 8, opt LF3)
- 2017 Chevrolet Corvette
Please ensure your vehicle is on this list. The most accurate way to guarantee compatibility is by matching your original part number to one of the numbers listed above.
Frequently Asked Questions About This ECM
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact, correct GM software calibration for your truck’s specific engine, transmission, and emissions equipment. This ensures proper function and avoids compatibility issues.
What is a “theft deterrent relearn”?
It’s a security procedure that syncs the new ECM to your vehicle’s ignition key and Body Control Module. Without this step, the vehicle’s anti-theft system will prevent the engine from starting. This requires a professional scan tool with GM software access (like TIS2Web/Techline Connect).
Can I perform the relearn procedures myself?
If you are a professional technician or an advanced DIYer with access to a high-level scan tool and a subscription to GM’s Techline Connect, you can perform these procedures. Otherwise, you will need to have a qualified local mechanic complete the installation.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the original ECM (e.g., code P0601), this part is the correct fix. However, you must ensure the root cause of the failure has been properly diagnosed, as other faulty sensors or wiring can also trigger warning lights.
Is this part difficult to install?
The physical replacement of the module is straightforward, typically involving a few bolts and electrical connectors. The challenging part is the electronic relearn procedure required after installation, which necessitates specialized equipment.
What other part numbers does this replace?
This ECM is a direct, compatible replacement for several part numbers, including 12692068, 12704476, 12686382, 12674052, and 12674472, in addition to 12678815.