Restore Your Truck’s Power and Reliability
Is your heavy-duty Sierra, Silverado, or Express van suddenly unreliable, leaving you stranded or dealing with frustrating performance issues? A faulty Engine Control Module (ECM) is often the culprit, causing everything from a no-start condition to poor fuel economy and check engine lights. This isn’t just an inconvenience; for a work vehicle, it’s a direct hit to your productivity and income. Get your truck back on the job with this fully programmed ECM, engineered to restore the factory performance and dependability you rely on every single day.
Common Symptoms & Your Solution
If your 6.6L Duramax is experiencing any of the following, a failing ECM is the likely cause. This unit is the definitive solution for:
- Complete no-start or intermittent stalling
- Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs) like U0100
- Poor engine performance, hesitation, or misfires
- Reduced fuel efficiency
- Problems with injector firing or transmission shifting
By installing our pre-flashed computer, you’re not just replacing a part; you’re providing a precise, reliable fix. We use your vehicle’s VIN to load the latest, most stable software from GM, ensuring your engine and transmission operate exactly as the manufacturer intended. This is the most effective way to solve complex electronic issues and avoid costly diagnostic guesswork.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with the newest GM calibrations for your exact vehicle, ensuring seamless integration and optimal performance right out of the box.
- ✔ Direct-Fit Replacement: This unit is a direct replacement for part numbers 12658036 and 12667377, guaranteeing a perfect fit and correct electronic communication.
- ✔ Get Back to Work Faster: Eliminate the need for a trip to the dealership for programming. This module arrives ready for installation, minimizing your vehicle’s downtime.
- ✔ Cost-Effective Solution: Get the same quality and software as a dealership part without the excessive markup.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty.
Expert Insight: The Programming is Key
As a technician, I’ve seen countless hours wasted trying to diagnose phantom issues that all trace back to a faulty or incorrectly programmed ECM. On these 6.6L Duramax engines, the ECM controls everything from fuel injection timing to transmission shift points. Using a generic, non-programmed module is a recipe for disaster. That’s why a professionally prepared, VIN-specific Programmed 12658036 GM 6.6L ECM is the only way to do the job right. It ensures all related vehicle systems communicate correctly, restoring the power and efficiency these workhorses are known for and preventing frustrating comebacks.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your ECM without it. Please double-check it for accuracy to ensure correct programming.
Will I need to do anything after installation?
In many cases, the vehicle will start and run perfectly. However, due to GM’s security systems, a Vehicle Anti-Theft System (VATS) relearn may be required if the vehicle does not start. This, along with other potential relearns like for crankshaft variation, is the responsibility of the installer and may require a professional scan tool.
Is this a direct replacement for my original part?
Yes. This ECM is a direct replacement for original part numbers 12658036 and 12667377. As long as your vehicle is listed in the compatibility chart, this module will fit and function correctly once programmed to your VIN.
What vehicles does this Programmed 12658036 GM 6.6L ECM fit?
This module fits a range of 2014 and 2015 GM heavy-duty trucks and vans equipped with the 6.6L Duramax diesel engine, including the Silverado 2500/3500, Sierra 2500/3500, and Express/Savana 2500/3500 vans. Please check the fitment list on this page to confirm for your specific vehicle.
What kind of warranty is included?
This unit is backed by our one-year replacement warranty, giving you confidence in your repair.