Get Your Duramax Back to Work, Fast
When your Silverado, Sierra, Express, or Savana van is down, your entire operation can grind to a halt. A faulty Engine Control Module (ECM) can cause a cascade of frustrating issues, from a no-start condition to poor performance that leaves you stranded. This isn’t just an inconvenience; it’s lost time and money. We provide the definitive solution: a replacement ECM, part number 12658036, that arrives at your door pre-programmed to your vehicle’s specific VIN.
Common Symptoms & Your Solution
If you’re experiencing issues like random stalling, communication error codes (U-codes), false sensor readings, or a complete failure to start, a failing ECM is a likely culprit. Instead of dealing with the high costs and scheduling hassles of a dealership, you can solve the problem yourself. This module is the electronic brain of your 6.6L Duramax engine, and our pre-programming service ensures it integrates seamlessly with your truck or van. By purchasing our Programmed 12658036 ECM, you’re not just buying a part; you’re buying a reliable, plug-and-play solution to get you back on the road.
Features & Real-World Benefits
- ✔ VIN-Specific Programming Included: We flash the unit with the latest GM software updates using your vehicle’s VIN. This ensures perfect compatibility and saves you a costly trip to the dealer.
- ✔ Restored Engine Performance: A correctly functioning ECM is critical for proper fuel delivery, emissions control, and transmission shifting, restoring the power and efficiency you depend on.
- ✔ Direct Fit Replacement: This module is a direct replacement for part numbers 12658036 and 12667377, guaranteeing a perfect fit in the factory location.
- ✔ Eliminate Guesswork: Stop chasing phantom sensor codes. A new, correctly programmed ECM provides a stable foundation for your vehicle’s diagnostic system.
- ✔ Cost-Effective Repair: Avoid the high labor rates and markups of a dealership service department with a part that’s prepared for your vehicle.
- ✔ This unit is backed by our one-year replacement warranty for your peace of mind.
Expert Insight: The Importance of Correct Programming
As a technician with over two decades of experience, I’ve seen countless vehicle issues caused by improperly matched control modules. Simply installing a used ECM from another truck won’t work. Modern vehicles have complex security and communication networks. Our process of programming the module to your specific VIN before shipping is the single most important step. It ensures the new ECM can properly communicate with the Body Control Module (BCM), Transmission Control Module (TCM), and other vital systems, preventing a host of frustrating post-installation problems.
Installation & Relearn Notice
After you purchase, please provide us with your VIN to complete the programming. Upon installation, some vehicles may require a security or “theft deterrent” relearn procedure to allow the vehicle to start. This procedure requires access to the GM programming system (tis2web) and is the responsibility of the installer. Other vehicle-specific setups, such as for injectors or crankshaft position variation, may also be necessary. This Programmed 12658036 ECM provides the correct foundation, but final integration is key to a successful repair.
Frequently Asked Questions
What information do you need from me?
After you place your order, we require your 17-digit Vehicle Identification Number (VIN). This is essential for us to load the correct, vehicle-specific software and calibrations onto the ECM before we ship it.
Will I need to do a ‘theft relearn’ procedure?
It’s possible. On many GM vehicles, the ECM is part of the anti-theft system. If the vehicle does not start after installation, a security relearn using a GM-compatible scan tool and software like tis2web will be necessary. This is a standard procedure for this type of repair and is the responsibility of the installer.
Is this a direct replacement for part number 12667377?
Yes. This ECM, primary part number 12658036, is the correct and compatible service replacement for units marked with 12667377 for the specified vehicles.
What vehicles does this ECM fit?
This module fits 2014-2015 Chevrolet Express/Silverado and GMC Savana/Sierra/Sierra Denali 2500 & 3500 models equipped with the 6.6L Duramax diesel engine. Please verify the part number to ensure exact fitment.
Do I need to do any other relearns after installation?
Depending on your specific vehicle and the original reason for failure, other procedures like a crankshaft variation relearn or injector flow rate programming may be required. We program the ECM to your VIN, but final system setups must be performed on the vehicle by the installer.