Is Your Sierra 1500 Running Rough? The ECM Might Be the Culprit.
If your 2016, 2017, or 2018 GMC Sierra 1500 is experiencing frustrating issues like poor fuel economy, a persistent check engine light, stalling, or a complete no-start condition, a failing Engine Control Module (ECM) is a very likely cause. The ECM is the central computer of your truck’s engine, managing everything from fuel injection and ignition timing to transmission shifting. When it fails, it can create a cascade of problems that are often misdiagnosed, leading to costly and unnecessary repairs.
This is a direct-fit replacement Engine Control Module, part number 12674052, for your truck. We take the guesswork out of the repair by pre-programming the unit specifically to your vehicle using your VIN. This ensures that it has the latest software updates from GM and is ready for installation, saving you a trip to the dealership and expensive programming fees. Simply provide your VIN after purchase, and we’ll handle the rest, shipping you a module that is prepared to restore your truck’s factory performance and reliability.
From the Diagnostic Bay
We had a 2017 Sierra 1500 come into the shop with a classic “parts cannon” history. The owner had replaced the throttle body, MAF sensor, and all four O2 sensors trying to chase down an intermittent stalling issue and a P0606 (ECM Processor Fault) code. The truck would run fine for a day, then suddenly die at a stoplight. After confirming all sensor inputs were good, we focused on the ECM itself. We installed one of our VIN-programmed modules, performed the quick security relearn, and the truck ran perfectly. The internal processor on the original ECM was failing intermittently under heat, a common issue we see. This case highlights how a properly diagnosed and programmed ECM can save hundreds, if not thousands, in unnecessary parts and labor.
Symptoms of a Failing 2016-2018 Sierra 1500 ECM
- ✔ Check Engine Light is on with communication or processor-related fault codes (e.g., P0601, P0606).
- ✔ The engine cranks but will not start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Transmission shifting issues or getting stuck in a single gear.
- ✔ Seemingly random electrical issues or warning lights on the dash.
- ✔ Failure to pass an emissions test.
Installation and Relearn Procedures
Once you receive your VIN-programmed ECM, installation is straightforward. However, it is critical to understand the next steps. Because the ECM is tied into your truck’s anti-theft system, a Vehicle Theft Deterrent (VTD) relearn will be necessary in most cases. This procedure syncs the new module with your vehicle’s security system. Without it, the truck will not start. This procedure must be performed using a professional GM diagnostic tool like Tis2web or Techline Connect. Additionally, other system initializations, such as a crankshaft position variation relearn or injector flow rate programming, may be required depending on your specific vehicle configuration. It is the responsibility of the installer to ensure all necessary relearn and setup procedures are completed for proper vehicle function.
Guaranteed Fitment
This module is a direct replacement for multiple part numbers, ensuring broad compatibility. It is guaranteed to fit the following vehicles:
- 2016-2018 Sierra 1500 Pickup
- 2016-2018 Silverado 1500 Pickup
- 2017 Escalade & Escalade ESV
- 2017 Tahoe, Suburban 1500, Yukon, Yukon XL 1500
- And various Cadillac CTS, XTS, ATS, and Corvette models as listed in the fitment data.
This module replaces part numbers: 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. By ordering this part, you are getting a reliable solution to get your vehicle back in top operating condition.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your order until we receive this information, as the programming is specific to your truck.
What is a Vehicle Theft Deterrent (VTD) relearn?
The VTD relearn is a security procedure that syncs the new ECM to your vehicle’s ignition keys and security system. It requires a GM-specific scan tool (like Tis2web/Techline Connect) and is a necessary step after installation to allow the engine to start.
Can I install this myself?
While the physical installation is straightforward for a DIY mechanic, the post-installation electronic relearn procedures require professional-grade diagnostic equipment. We recommend installation by a qualified automotive technician who has access to these tools.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, this part will resolve the issue. However, it’s crucial to have your vehicle properly diagnosed to ensure the ECM is the root cause of the problem before ordering.
Is this compatible with other GM trucks and SUVs?
Yes, this ECM fits a wide range of GM vehicles from 2016-2018, including the Silverado, Tahoe, Suburban, and Yukon. Please check the detailed fitment list on this page to confirm compatibility with your specific model and year.