Get Your Heavy-Duty Truck Back to Work
When your Sierra 3500 is down, your work stops. A failing Engine Control Module (ECM) can bring your entire operation to a halt, causing frustrating no-start conditions, erratic engine behavior, and persistent check engine lights. This isn’t just an inconvenience; it’s a direct hit to your productivity. This direct-fit Engine Control Module is the reliable, professional-grade solution to get your truck’s powertrain operating with factory precision, minimizing your downtime and getting you back on the road.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty ECM is the likely culprit. This pre-programmed module is engineered to be the definitive fix for:
- Complete no-start or intermittent starting problems
- Poor engine performance, hesitation, or stalling
- Noticeable decrease in fuel economy
- Check Engine Light (CEL) with communication-related codes (e.g., U0100) or processor fault codes (e.g., P0606)
- Transmission shifting issues or erratic behavior
- Failure to pass emissions testing
Features & Benefits
- ✔ Ready for Installation: We program this module to your vehicle’s specific VIN number before shipping. This eliminates the need for expensive dealership programming, making for a straightforward installation.
- ✔ Optimized Factory Performance: Your new ECM is flashed with the latest, most stable software updates directly from GM, ensuring your engine runs at peak efficiency and reliability.
- ✔ Direct-Fit Replacement: Engineered to be a perfect replacement for a wide range of original part numbers, including 12668866, 12668994, 12643636, and the 2012-2016 Sierra 3500 6.0L ECM 12670335.
- ✔ Broad GM Compatibility: While perfect for the Sierra 3500, this versatile module also fits an extensive list of other GM vehicles, including the Silverado, Express/Savana vans, Cruze, and Sonic.
- ✔ Peace of Mind Protection: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Programming
As a technician with over 20 years on the floor, I’ve seen countless issues arise from improperly sourced control modules. Simply grabbing a used computer from a salvage yard is a recipe for disaster. Modern vehicles have complex security and communication systems that are tied directly to the VIN. Our process of programming the module to your specific VIN before it leaves our facility is the most critical step. It ensures all the individual systems in your truck—from the engine and transmission to the anti-lock brakes—can communicate correctly, just as the factory intended. This isn’t just a convenience; it’s the key to a successful and lasting repair.
Don’t let a bad computer dictate your work schedule. By providing your VIN at checkout, you ensure that you receive a fully updated, correctly configured module ready to restore your truck’s performance and dependability. This is the smart, efficient way to solve complex electronic issues and get your 2012-2016 Sierra 3500 6.0L ECM 12670335 running right.
Frequently Asked Questions
Why is my vehicle’s VIN required?
Your Vehicle Identification Number (VIN) contains critical information about your truck’s specific options, engine, transmission, and emissions equipment. We use the VIN to load the exact GM-certified software for your vehicle, ensuring perfect compatibility and performance right out of the box.
Will I need to do any additional programming after installation?
In most cases, no additional programming is required. The module arrives ready to be installed. However, some vehicles may require a simple “Security Relearn” or “CASE Relearn” procedure, which can often be done without special tools. Instructions are widely available online for these common procedures.
How can I be sure my ECM is the problem?
While the symptoms listed above are strong indicators, we always recommend a thorough diagnosis by a qualified technician. This ensures you are replacing the correct part and avoids unnecessary expense. Checking for communication codes with a professional scan tool is a key diagnostic step.
Does this part fit vehicles other than the Sierra 3500?
Yes. This ECM is a direct replacement for many GM vehicles, including the Silverado 2500/3500, Express/Savana vans, Cruze, Sonic, Volt, and Encore within the specified year ranges. Please check the detailed fitment list on this page to confirm compatibility.
What is the warranty on this computer?
This unit is backed by our one-year replacement warranty. This gives you confidence in the quality and reliability of your purchase.