Restore Peak Performance to Your GM Truck or SUV
Is your 2016-2018 Sierra 1500, Silverado, or other compatible GM vehicle suffering from frustrating, hard-to-diagnose issues? A failing Engine Control Module (ECM) is often the culprit behind problems that can sideline your truck. As the ‘brain’ of your vehicle, the ECM governs everything from fuel injection and ignition timing to transmission shifting and emissions control. When it falters, the symptoms can be widespread and confusing. This replacement Sierra 1500 Engine Module is the definitive solution to restore your vehicle’s reliability and drivability.
We take the guesswork and high dealership costs out of the equation. Unlike a generic module off the shelf, this ECM comes professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest, most stable software updates directly from GM, ensuring optimal performance and compatibility right out of the box. This critical step saves you a trip to the dealer and eliminates potential software conflicts that can arise from unprogrammed modules.
From the Diagnostic Bay: The Intermittent No-Start Nightmare
I once had a 2017 Silverado in my bay that was a real head-scratcher. The owner said it would randomly refuse to start, with no crank and no communication with the scan tool. Other times, it would start and run perfectly for weeks. We checked the battery, starter, and all the main power and ground circuits—everything was solid. After chasing wiring diagrams for hours, we noticed the 5-volt reference signal to several sensors would occasionally drop out. This pointed us directly to the ECM. On these GM trucks, internal circuit board failures in the ECM can cause intermittent power loss to critical systems. We installed a VIN-programmed module, performed the security relearn, and the truck has been running without a single issue for over a year. It’s a classic case where the central computer was causing a ghost-in-the-machine problem.
Is Your Truck Exhibiting These ECM Failure Signs?
A faulty ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your Sierra 1500 Engine Module may need replacement:
- ✔ Persistent Check Engine Light (CEL) with communication error codes like U0100 (Lost Communication with ECM/PCM).
- ✔ Internal module failure codes such as P0601, P0603, or P0606.
- ✔ Engine cranks but refuses to start, or experiences intermittent no-start conditions.
- ✔ Noticeable decrease in fuel economy and poor engine performance.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Transmission shifting issues or failure to go into gear.
- ✔ Failure to pass state emissions testing.
Your Straightforward Installation Path
Replacing the ECM is a manageable job for a seasoned DIYer or a quick task for any professional technician. Our pre-programming service handles the most complex part for you. Follow these general steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the Module: On most Sierra/Silverado models, the ECM is located in the left-hand (driver’s side) front of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that must be released. Then, unbolt the module from its mounting bracket.
- Install the New ECM: Mount the new module securely and reconnect the electrical harnesses, ensuring they click firmly into place.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Relearn Procedures: This is a critical final step. You will need to perform the Vehicle Theft Deterrent System relearn. If the vehicle does not start, this is the reason. Other procedures like the crankshaft position variation relearn may also be necessary for optimal performance.
A Note on Post-Installation Procedures
This Sierra 1500 Engine Module is sold programmed with the correct GM calibrations for your VIN. However, integrating it with your specific vehicle requires a final handshake. The buyer is responsible for performing the security relearn using a compatible scan tool with access to GM’s Tis2web or Techline Connect service. This ensures the ECM communicates with your truck’s anti-theft system. Any other required setups, like for fuel injectors or sensors, are also the responsibility of the installer.
Verified Compatibility Across GM Models
This module is a direct replacement for part number 12674052 and interchanges with 12692068, 12704476, 12686382, 12674472, and 12678815. It is guaranteed to fit the following vehicles:
- ATS 2017: (LH engine compartment), 3.6L, VIN Y (8th digit, opt LF4)
- CORVETTE 2017: (RH cowl under dash)
- CTS 2017: 3.6L, VIN 8 (8th digit, opt LF3, twin turbo)
- CTS 2017: 6.2L (supercharged)
- ESCALADE & ESCALADE ESV 2017: (engine compartment)
- SIERRA 1500 PICKUP 2016: (LH front engine compartment), ID 12674472
- SIERRA 1500 PICKUP 2017: (LH front engine compartment)
- SIERRA 1500 PICKUP 2018: (LH front engine compartment), ID 12686382
- SIERRA DENALI 1500 2017-2018: (LH front engine compartment)
- SILVERADO 1500 PICKUP 2016: (LH front engine compartment), ID 12674472
- SILVERADO 1500 PICKUP 2017-2018: (LH front engine compartment)
- SUBURBAN 1500 2017: (LH front engine compartment)
- TAHOE 2017: (LH front engine compartment)
- XTS 2017: (3.6L), VIN 8 (8th digit, opt LF3)
- YUKON 2017: (LH front engine compartment)
- YUKON XL 1500 2017: (LH front engine compartment)
Frequently Asked Questions
How do I provide my VIN for programming?
After completing your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as it’s required for the programming service.
What is a Vehicle Theft Deterrent (VTD) relearn?
The VTD relearn is a security procedure that syncs the new ECM to your vehicle’s other modules, like the Body Control Module and ignition key. This is a required step to allow the engine to start after installation. It requires a professional scan tool with GM software access.
Can I perform the VTD relearn myself?
For most DIYers, the answer is no. The relearn procedure requires specific software (GM Tis2web/Techline Connect) that is typically only available to professional repair shops. We recommend having a local certified mechanic perform this quick procedure for you after you’ve installed the part.
Will this fix my specific problem?
This module corrects issues directly caused by a failing ECM. While the symptoms we’ve listed are common indicators, we always recommend a proper diagnosis by a qualified technician to confirm the ECM is the point of failure before ordering.
What if my original part number isn’t an exact match?
This ECM, part number 12674052, also replaces several other GM part numbers, including 12692068, 12704476, and more. As long as your vehicle is on our compatibility list, this module will function correctly once programmed to your VIN.