Is Your Sierra 1500 Running Rough or Not Starting At All?
As a technician with over two decades of experience, I know the frustration of a vehicle that won’t cooperate. When a modern truck like your 2016-2018 Sierra 1500 starts acting up, the Engine Control Module (ECM) is often the culprit. A failing ECM can feel like a ghost in the machine, causing a cascade of confusing problems that can lead you down expensive diagnostic rabbit holes.
Stop Guessing and Get the Right Solution
This isn’t just a replacement part; it’s a direct solution. We take a genuine GM Engine Control Module (Part #12674052) and professionally program it to your truck’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This ensures it’s loaded with the latest factory software from GM, addressing common drivability issues and ensuring seamless communication with your truck’s other systems.
- โ Fix Common Failure Symptoms: Erase persistent Check Engine Lights (CEL), solve no-start conditions, correct erratic idling, and restore lost engine power.
- โ VIN-Programmed for Your Truck: No need to pay expensive dealer programming fees. Just provide your VIN at checkout, and we handle the rest.
- โ Direct-Fit Replacement: This module is a guaranteed fit for a wide range of GM vehicles, ensuring the physical installation is straightforward.
- โ Interchangeable Part Numbers: This unit directly replaces part numbers 12692068, 12704476, 12686382, 12674472, and 12678815.
From the Shop Floor: A Real-World Scenario
“A customer’s 2017 Sierra 1500 came in last month on a tow truck. It would crank but never start. He had already replaced the fuel pump and a camshaft sensor based on some generic trouble codes. After hooking up my scan tool, I noticed the injector pulse width was completely erraticโa classic sign of a confused computer. We installed one of our VIN-programmed ECMs, performed the security relearn, and the truck fired up on the first try. It saved him from replacing more perfectly good parts.”
Installation and Post-Install Requirements: What You Need to Know
While we handle the complex software programming, final vehicle integration is required upon installation. This is a standard procedure for modern vehicle security systems.
- Provide Your VIN: After your purchase, you must send us your 17-digit VIN. We cannot ship the module without it.
- Physical Installation: The ECM is typically located in the front left of the engine compartment. Disconnect the battery, carefully unplug the old module’s connectors, unbolt it, and install the new one in its place.
- CRITICAL: Security Relearn Procedure: After installation, your truck’s anti-theft system will prevent it from starting until a security relearn is performed. This procedure syncs the new ECM with your vehicle. This MUST be done using a professional GM diagnostic tool like Tis2web or Techline Connect.
- Other Relearns: Depending on your vehicle’s specific configuration, additional procedures like a Crankshaft Variation Relearn or injector flow rate programming may also be necessary. This is the responsibility of the installer.
Is This the Right Part for Your 2016-2018 Sierra 1500 ECM?
This module is the correct fit for a wide variety of GM trucks and SUVs. Please verify your part number or match your vehicle from the list below to ensure compatibility. If you’re unsure, our team of experienced technicians is here to help you confirm the correct fitment for your vehicle.
Comprehensive Fitment List:
This part fits these makes and models with these options:
- GMC Sierra 1500 / Sierra Denali 1500: 2016 (ID 12674472), 2017, 2018 (ID 12686382)
- Chevrolet Silverado 1500: 2016 (ID 12674472), 2017, 2018 (ID 12686382)
- Cadillac Escalade / ESV: 2017
- Chevrolet Tahoe / Suburban 1500: 2017
- GMC Yukon / Yukon XL 1500: 2017
- Cadillac ATS: 2017 (3.6L, VIN Y)
- Cadillac CTS: 2017 (6.2L Supercharged or 3.6L Twin Turbo VIN 8)
- Cadillac XTS: 2017 (3.6L, VIN 8)
- Chevrolet Corvette: 2017