Restore Peak Performance to Your GM Truck or SUV
Is your 2016-2018 Sierra 1500, Silverado, Tahoe, or other compatible GM vehicle suffering from perplexing issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition? These are classic signs of a failing Engine Control Module (ECM), the central computer that governs your vehicle’s engine performance, fuel delivery, and emissions systems. A faulty ECM can cripple your truck’s reliability and leave you stranded. This genuine GM Engine Control Module, part number 12674472, is the definitive solution to restore your vehicle’s factory performance and dependability.
The Brain of Your Operation: Why a Healthy ECM Matters
The ECM is arguably the most critical electronic component in your modern vehicle. It processes a constant stream of data from sensors throughout the engine and drivetrain to make real-time adjustments to the fuel-to-air ratio, ignition timing, transmission shift points, and dozens of other parameters. When it begins to fail, the symptoms can be widespread and difficult to diagnose, often mimicking other mechanical problems. Replacing it with a generic, unprogrammed unit from a local parts store often leads to more headaches, as it won’t have the specific software your vehicle requires. Our solution eliminates that guesswork.
From the Diagnostic Bay
We had a 2017 Silverado 1500 in the shop that was driving the owner crazy. It would randomly stall at red lights, but never threw a consistent trouble code. We checked the fuel pump, throttle body, and all the usual suspects with no luck. On a hunch, we monitored the live data stream from the ECM and noticed the voltage readings for several key sensors were fluctuating wildly, but the sensors themselves tested fine. That pointed us directly to an internal fault in the ECM. After installing a VIN-programmed module like this one and performing the crankshaft variation relearn, the truck ran perfectly. It’s a reminder that sometimes the most baffling problems trace back to the vehicle’s central computer.
Common Symptoms of a Failing Engine Control Module
- ✔ Persistent and illuminated Check Engine Light (CEL).
- ✔ Unexplained drop in fuel efficiency.
- ✔ Engine stalling, stuttering, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Noticeable loss of engine power and acceleration.
- ✔ Communication errors with diagnostic scan tools.
Your Direct-Fit 2016-2018 Sierra Engine Module Solution
Don’t settle for a one-size-fits-all part. We make the replacement process straightforward. When you purchase this ECM, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then use official GM equipment to flash the module with the latest, most up-to-date software calibration specifically for your truck’s configuration. This ensures that once installed, the computer is perfectly matched to your engine, transmission, and factory options. It arrives at your door ready for installation, saving you a costly trip to the dealership for programming.
Critical Installation & Relearn Procedures
Please Note: While we handle the primary programming, modern vehicles have sophisticated security and adaptive learning systems. After installing this 2016-2018 Sierra Engine Module, certain procedures MUST be performed for the vehicle to operate correctly. It is the buyer’s responsibility to ensure these are completed.
- Vehicle Theft Deterrent System (VTDS) Relearn: If the vehicle does not start after installation, the security system must be synchronized with the new ECM. This procedure requires access to GM’s programming software (such as TIS2Web or Techline Connect) and a compatible J2534 interface tool. Many professional repair shops are equipped to perform this service.
- Crankshaft Position Variation Relearn: This procedure allows the new ECM to learn the precise position of the crankshaft reluctor wheel, which is essential for accurate misfire detection and ignition timing. This also requires a professional-grade scan tool.
- Other Setups: Depending on your vehicle’s specific options, other minor relearns or setup procedures (like for fuel injectors) may be necessary.
Guaranteed Fitment
This module is a direct replacement for part number 12674472 and is also compatible with several other part numbers, including 12692068, 12704476, 12686382, 12674052, and 12678815. It is confirmed to fit the following vehicles:
- 2017 Cadillac Escalade & Escalade ESV
- 2017 Cadillac XTS (3.6L Twin Turbo)
- 2017 Chevrolet Tahoe
- 2017 GMC Yukon & Yukon XL 1500
- 2017 Cadillac CTS (6.2L Supercharged & 3.6L Twin Turbo)
- 2017 Chevrolet Corvette
- 2016-2017 GMC Sierra 1500 & Sierra Denali 1500
- 2016-2017 Chevrolet Silverado 1500
- 2017 Chevrolet Suburban 1500
- 2017 Cadillac ATS (3.6L)
- 2018 GMC Sierra 1500 / Denali 1500 (ID 12686382)
- 2018 Chevrolet Silverado 1500 (ID 12686382)
By purchasing this pre-programmed 2016-2018 Sierra Engine Module, you are getting a reliable, vehicle-specific part that directly addresses the root cause of many complex engine management issues.
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you must provide us with your 17-digit VIN. Our technicians use this number to access the official GM database and download the exact software calibration for your vehicle’s specific build. We then flash this software onto the module before shipping it to you.
What is a ‘theft deterrent relearn’ and can I do it myself?
The theft deterrent system links your vehicle’s key, ignition, and ECM. When you replace the ECM, this link is broken, and the system must be re-synced to allow the engine to start. This procedure requires professional tools and software like GM’s Techline Connect. It is not something that can be done with basic hand tools.
Is professional installation required?
While the physical installation of the module is straightforward for an experienced DIYer, the mandatory post-installation relearn procedures (theft, crankshaft variation, etc.) require professional diagnostic equipment. We strongly recommend having the installation and final setup performed by a qualified automotive technician.
How do I confirm this is the correct part for my truck?
The best way is to match the part number from your original ECM to one of the numbers listed (12674472, 12692068, 12704476, etc.). You can also check the comprehensive fitment list on this page or contact us with your VIN, and we can verify compatibility for you.
What happens if I don’t perform the crankshaft variation relearn?
If the crankshaft position variation relearn is not performed, the ECM will not be able to accurately detect engine misfires. This will almost certainly result in the Check Engine Light illuminating with a P0300 (Random/Multiple Misfire) code, even if the engine is running perfectly.