Is Your Silverado Running Rough? Restore Its Brainpower.
If your 2016-2018 Chevrolet Silverado 1500 is experiencing perplexing issues like stalling, erratic idling, a persistent Check Engine Light, or a complete no-start condition, the root cause is often a failing Engine Control Module (ECM). The ECM is the central computer of your truck, managing everything from fuel injection and ignition timing to transmission shifts and emissions. When it falters, the entire vehicle’s performance suffers. This replacement Engine Control Module, part number 12674052, is the definitive solution to restore your truck’s factory performance and reliability.
We take the guesswork out of the repair. Unlike a generic module from a parts store, this unit is professionally programmed specifically for your vehicle. Simply provide us with your truck’s Vehicle Identification Number (VIN) after purchase, and our technicians will flash the module with the latest, most up-to-date software calibrations directly from General Motors. This ensures perfect compatibility and optimal performance, just as the engineers intended.
From the Diagnostic Bay
We had a 2017 Sierra 1500 come in on a tow truck. The owner had replaced the fuel pump, spark plugs, and even the throttle body trying to chase down an intermittent stalling and hard-start problem. After hours of diagnostics, we traced the issue to a failing ECM that was intermittently dropping communication with the fuel pump control module. A quick check of the original part number confirmed it was a match for this unit. After installing our VIN-programmed replacement and performing the security relearn, the truck fired up instantly and ran perfectly. It’s a classic case where throwing parts at a problem costs more than a proper diagnosis pointing to the vehicle’s central computer.
Symptoms of a Failing 2016-2018 Silverado 1500 ECM
- ✔ Persistent Check Engine Light (CEL) with various communication or processor-related codes.
- ✔ Engine stalling, stumbling, or hesitating unexpectedly.
- ✔ Noticeable decrease in fuel economy.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Poor engine performance, lack of power, and rough idling.
- ✔ Automatic transmission shifting erratically or harshly.
- ✔ Unexplained electrical issues or warning lights on the dashboard.
The Programming and Installation Process Explained
Your new ECM arrives programmed and ready for the final steps of installation. Once you receive the part, you or your mechanic will install it in your vehicle (typically located in the LH front of the engine compartment). However, the process is not complete until a Vehicle Theft Deterrent System Relearn is performed. This is a mandatory security procedure that syncs the new ECM with your truck’s existing anti-theft system. Without this step, the vehicle will not start.
This relearn procedure requires a GM-specific diagnostic tool like a Tech 2 or access to GM’s Tis2web/Techline Connect software. Additionally, other vehicle-specific setups may be required, such as a Crankshaft Position Variation Relearn or setting new injector flow rates if injectors were also replaced. These are standard procedures for any professional technician replacing a modern engine computer. It is the buyer’s responsibility to ensure these final setup procedures are completed by a qualified professional.
Guaranteed Fitment and Compatibility
This module is a direct replacement for part number 12674052 and is also compatible with several other GM part numbers, including 12692068, 12704476, 12686382, 12674472, and 12678815. It fits a wide range of GM trucks and SUVs beyond the Silverado 1500. Please verify the part number on your original module to ensure a perfect match for your vehicle. This part is confirmed to fit the following vehicles:
- 2016-2018 Chevrolet Silverado 1500
- 2016-2018 GMC Sierra 1500 / Sierra Denali 1500
- 2017 Chevrolet Tahoe & Suburban 1500
- 2017 GMC Yukon & Yukon XL 1500
- 2017 Cadillac Escalade & Escalade ESV
- And other select GM models.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is specific to your vehicle.
What happens if I don’t perform the security relearn?
If the Vehicle Theft Deterrent System relearn is not performed, the engine’s starter will be disabled by the security system, and your truck will not start. This is a standard security feature on all modern GM vehicles.
Is this part truly plug-and-play?
It is ‘plug-in and program’. The module will be programmed with your vehicle’s software before it ships, but the final security relearn and any other necessary calibrations (like crankshaft variation) must be done after installation on the vehicle.
How can I be sure my old ECM is the problem?
A thorough diagnosis by a qualified technician is the best way to confirm an ECM failure. Common indicators include communication-related trouble codes (U-codes), multiple unrelated sensor codes, or a complete lack of communication with a scan tool.
What tools are needed for the final setup?
A professional-grade scan tool with GM-specific software is required. Tools like the GM MDI with a GDS2/Tis2web subscription or an advanced aftermarket tool with full bidirectional capabilities are necessary to complete the security and other relearn procedures.