Is Your Sierra 1500 Plagued with Engine Problems?
If you’re dealing with a frustrating no-start condition, a check engine light that won’t go away, poor fuel economy, or erratic engine behavior in your 2016-2018 Sierra, a failing Engine Control Module (ECM) is a very likely culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can turn a reliable truck into a source of constant headaches. It’s the brain of your engine, and when it malfunctions, nothing works as it should.
Common Symptoms of a Failing GM Engine Computer:
- โ Persistent Check Engine Light (CEL) with various communication or processor codes.
- โ Engine cranks but refuses to start.
- โ Noticeable drop in fuel mileage.
- โ Rough idling, stalling, or hesitation during acceleration.
- โ Transmission shifting issues or harsh engagement.
- โ False warnings for other systems on the instrument cluster.
The Smart Solution: A VIN-Programmed 2016-2018 Sierra 1500 ECM
Skip the expensive dealership visit and the hassle of finding a shop equipped for programming. We take the guesswork out of the repair. This genuine GM engine control module is professionally programmed with the latest factory software releases specifically for your truck using the VIN you provide. This ensures that all calibrations for your engine, transmission, and emissions equipment are perfectly matched, restoring the performance and reliability you depend on.
Expert Pro Tip: Protect Your New Module
Before installing your new ECM, take a moment to inspect the components that the old one controlled. In my shop, a common cause for repeated ECM failure is an external short. For example, a failing ignition coil or a shorted fuel injector wire can send excessive voltage back to the ECM, damaging the internal driver circuit. A quick visual inspection of the engine harness and resistance check on the coils can save you from frying your new part.
Important Installation & Relearn Information
Please be aware that installing this module is not always a simple plug-and-play process. Modern vehicles have sophisticated anti-theft systems that link the ECM to your specific key and vehicle.
A security relearn is often required. If the truck does not start after installation, you or your mechanic will need access to a professional scan tool with GM’s programming software (such as Tis2web or Techline Connect) to perform the Vehicle Theft Deterrent (VTD) relearn procedure. This is a standard security measure and is the responsibility of the installer.
Additionally, other procedures may be necessary for optimal performance, including:
- Crankshaft Position Variation Relearn: To ensure accurate misfire detection.
- Injector Flow Rate Programming: To match the new ECM to your existing fuel injectors.
- Other setup procedures as indicated by your specific vehicle’s needs.
Guaranteed Fitment & Part Number Compatibility
This module is a direct replacement for the following part numbers: 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815.
It is confirmed to fit the following vehicles:
- Cadillac Escalade / ESV: 2017
- Cadillac ATS: 2017 (3.6L LF4)
- Cadillac CTS: 2017 (6.2L Supercharged or 3.6L LF3 Twin Turbo)
- Cadillac XTS: 2017 (3.6L LF3)
- Chevrolet Corvette: 2017
- Chevrolet Silverado 1500: 2016-2018
- Chevrolet Suburban: 2017
- Chevrolet Tahoe: 2017
- GMC Sierra 1500 / Denali 1500: 2016-2018
- GMC Yukon / Yukon XL: 2017