Restore Peak Performance to Your GM Truck
Is your 2016-2018 Silverado 1500 running rough, stalling unexpectedly, or flashing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages everything from fuel injection to spark timing. A faulty ECM doesn’t just hurt performance; it can affect fuel economy and even leave you stranded. This isn’t just a replacement part; it’s a direct solution to restore your truck’s reliability and operational integrity.
We take the primary guesswork out of the equation. Each module is meticulously programmed with the latest official GM software updates, tailored specifically to your truck’s Vehicle Identification Number (VIN). This ensures that the computer you receive is calibrated for your exact engine, transmission, and emissions equipment. When you install a properly matched 2016-2018 Silverado 1500 ECM, you’re giving your vehicle the precise instructions it needs to run as the factory intended.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2017 Sierra 1500 that came into my shop with a whole laundry list of intermittent issues—random stalling at lights, hard shifting, and a check engine light that would come and go. The owner had already replaced a few sensors, but the problems persisted. A deep dive with my scan tool showed multiple communication errors (U-codes) pointing to the ECM. After swapping in a new, VIN-programmed module and performing the crankshaft and theft relearns, the truck ran like it just rolled off the assembly line. It’s a textbook example of how a failing ECM can mimic other problems, making a correct diagnosis and a properly programmed part absolutely essential.
Is Your Truck Exhibiting These ECM Failure Signs?
A failing ECM can cause a wide range of symptoms. If you’re experiencing any of the following, your engine computer could be the culprit:
- ✔ Persistent Check Engine Light (CEL) with codes like P0601, P0606, or other internal processor faults.
- ✔ Engine stalling or stumbling for no apparent reason.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Poor engine performance, hesitation, or misfires.
- ✔ Communication errors with scan tools or other vehicle modules (U-codes).
- ✔ Erratic automatic transmission shifting behavior.
Your Straightforward ECM Installation Guide
Installing your new 2016-2018 Silverado 1500 ECM is a manageable job for a seasoned DIYer or any professional technician. The most critical part is the post-installation procedures.
- 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 and Sierra models, the ECM is located in the engine compartment on the driver’s side (LH front).
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new ECM into place and securely reconnect the wiring harness connectors. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- CRITICAL – Perform Relearn Procedures: This step is non-negotiable. If the vehicle does not start, you MUST perform a Vehicle Theft Deterrent System (VTDS) relearn using a compatible scan tool with access to GM’s Tis2web or Techline Connect service. Other procedures like a Crankshaft Position Variation Relearn may also be required for optimal performance. This is the responsibility of the installer.
Verified Fitment Across a Range of GM Vehicles
This module, identified by part number 12674052, is a direct replacement for several other part numbers and fits a wide variety of GM trucks and SUVs. Please verify your part number or consult the list below. This part is compatible with the following vehicles and options:
- ATS 2017: Electronic Control Module; (LH engine compartment), 3.6L, VIN Y (8th digit, opt LF4)
- CORVETTE 2017: Electronic Control Module; (RH cowl under dash)
- CTS 2017: Electronic Control Module; 3.6L, VIN 8 (8th digit, opt LF3, twin turbo)
- CTS 2017: Electronic Control Module; 6.2L (supercharged)
- ESCALADE & ESCALADE ESV 2017: Electronic Control Module; (engine compartment)
- SIERRA 1500 PICKUP 2016: Electronic Control Module; (LH front engine compartment), ID 12674472
- SIERRA 1500 PICKUP 2017: Electronic Control Module; (LH front engine compartment)
- SIERRA 1500 PICKUP 2018: Electronic Control Module; (LH front engine compartment), ID 12686382
- SIERRA DENALI 1500 2017-2018: Electronic Control Module; (LH front engine compartment)
- SILVERADO 1500 PICKUP 2016: Electronic Control Module; (LH front engine compartment), ID 12674472
- SILVERADO 1500 PICKUP 2017-2018: Electronic Control Module; (LH front engine compartment)
- SUBURBAN 1500 2017: Electronic Control Module; (LH front engine compartment)
- TAHOE 2017: Electronic Control Module; (LH front engine compartment)
- XTS 2017: Electronic Control Module; (3.6L), VIN 8 (8th digit, opt LF3)
- YUKON & YUKON XL 1500 2017: Electronic Control Module; (LH front engine compartment)
This module is interchangeable with part numbers: 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815.
What happens after I place my order?
What happens after I place my order?
After your purchase is complete, you will need to send us your vehicle’s 17-digit VIN. We cannot program and ship your 2016-2018 Silverado 1500 ECM without it. This ensures you get the correct software for your truck.
What is a “theft relearn” and why is it necessary?
The Vehicle Theft Deterrent System (VTDS) links your ECM to other components like the ignition key and body control module. When you install a new ECM, the system sees it as a potential theft attempt and prevents the engine from starting. The relearn procedure securely pairs the new ECM to your vehicle, telling it that the new part is authorized.
Can I perform the theft relearn myself?
This procedure requires a professional-grade scan tool with an active subscription to GM’s programming software (Tis2web or Techline Connect). Most DIY code readers cannot perform this function. We strongly recommend having a qualified mechanic or dealership perform the final installation and relearn procedures.
Where is the ECM located on my 2017 Silverado 1500?
The ECM is typically found in the engine bay, mounted on the driver’s side front fender area. It’s a silver metal box with large electrical connectors.
Is programming included in the price?
Yes, the initial programming of the module to your specific VIN is included. However, the final on-vehicle procedures, such as the theft system relearn, crankshaft variation relearn, or injector flow rate programming, are the responsibility of the installer.