Get Your Heavy-Duty Truck Back to Work
When your Silverado, Sierra, or Savana is down, every minute counts. A faulty Engine Control Module (ECM) can bring your entire operation to a halt, causing frustrating no-start conditions, poor engine performance, and a dashboard lit up with warning lights. This isn’t just an inconvenience; it’s a roadblock to getting the job done. This pre-programmed Engine Control Module is the definitive, reliable solution to restore your truck’s performance and get you back on the road with confidence.
Common Symptoms & Your Direct Solution
A failing ECM can manifest in several ways, often leaving you stranded. If you’re experiencing any of the following, this module is the solution you need:
- Persistent Check Engine Light: Especially with communication-related Diagnostic Trouble Codes (DTCs) like U0100.
- No-Start or Hard-Start Conditions: The engine cranks but refuses to start, or starts only after extended cranking.
- Reduced Engine Power: Noticeable loss of acceleration and towing capability, sometimes referred to as “limp mode.”
- Poor Fuel Economy: The engine runs inefficiently, costing you more at the pump.
- Erratic Shifting or Stalling: The ECM is critical for managing both engine and transmission functions; failure can cause unpredictable behavior.
This replacement 2015 Duramax 6.6L ECM 12667377 is meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN), ensuring it works seamlessly with your truck’s existing systems right out of the box.
Features & Benefits
- ✔ VIN-Programmed for Your Truck: We flash the module with the latest GM factory calibrations using your VIN. This eliminates guesswork and ensures compatibility.
- ✔ Restores Peak Performance: Correct programming restores proper fuel delivery, ignition timing, and transmission control for a smooth and powerful ride.
- ✔ Direct-Fit Replacement: Engineered to be a direct replacement for part numbers 12658036 and 12667377, guaranteeing a perfect fit in the factory location.
- ✔ Cost-Effective Solution: Avoid the high costs and scheduling delays of a dealership visit by getting a ready-to-install part shipped directly to you.
- ✔ Get Back on the Road Faster: Our pre-programming service drastically reduces vehicle downtime, letting you get back to work or towing your trailer.
- ✔ This unit is backed by our one-year replacement warranty.
An Expert’s Note on Installation
As a technician, I’ve seen countless jobs get complicated by small details. With this 2015 Duramax 6.6L ECM 12667377, the programming is handled for you, but remember that modern trucks have sophisticated security systems. In some cases, the vehicle’s Body Control Module (BCM) may not recognize the new ECM, triggering the anti-theft system. This is a normal security feature, not a defect. Performing a “Security Relearn” or “Theft Deterrent Relearn” with a GM-compatible scan tool (like one using TIS2Web) syncs the components. Being prepared for this step is the key to a smooth, successful installation.
Frequently Asked Questions
How does the programming process work?
It’s simple. After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this number to load the exact, most current GM software and calibrations for your specific truck or van before we ship the part to you.
What is a security relearn and will I need to do it?
A security relearn syncs your new ECM with your vehicle’s anti-theft system. While not always required, it is a possibility upon installation. If the vehicle does not start, this procedure will be necessary and must be performed by a qualified technician with access to the proper GM programming system. This is the responsibility of the installer.
Is this a direct fit for my 2015 Silverado 3500?
Yes. This module is a guaranteed fit for the 2015 Silverado & Sierra 2500/3500, as well as Express & Savana 2500/3500 vans equipped with the 6.6L Duramax diesel engine. It also fits certain 2014 van models. Please see the full fitment list on this page to confirm your specific vehicle.
Will this ECM fix my truck’s other problems?
This 2015 Duramax 6.6L ECM 12667377 will resolve all issues directly caused by a faulty engine computer. However, it cannot fix separate mechanical or electrical problems, such as a bad fuel injector or a wiring short. Proper vehicle diagnosis is always recommended before replacing parts.
Do I need to send my old ECM back?
No core charge or return is required for this part. You can keep or dispose of your old module at your convenience.
What does the one-year warranty cover?
The warranty provides a replacement for the ECM unit itself in the event of failure within one year of the purchase date. It covers the part, not labor or diagnostic costs.