Get Your Hard-Working Truck Back on the Road
When your 2015 Sierra, Silverado, or Express/Savana van is down, your entire operation grinds to a halt. A faulty Engine Control Module (ECM) can cause a cascade of frustrating, hard-to-diagnose issues, from a complete no-start condition to poor performance that costs you time and money. This direct-fit ECM, part number 12658036, is the definitive solution to restore the power, reliability, and proper function of your 6.6L Duramax engine. We take the guesswork out of the equation by pre-programming the module to your truck’s specific VIN with the latest factory software updates from GM, ensuring a smoother installation process.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing engine computer could be the culprit. This VIN-programmed module is designed to resolve these exact problems:
- Complete no-start or intermittent starting issues
- Poor fuel economy and reduced engine power
- Check Engine Light (CEL) with communication-related Diagnostic Trouble Codes (DTCs) like U0100
- Erratic transmission shifting or gear selection problems
- False readings from various engine sensors
- Stalling or rough idling that you can’t seem to trace
By replacing your old module with this correctly programmed 2015 Sierra 2500 ECM, you’re not just swapping a part—you’re restoring the central nervous system of your truck’s powertrain.
Features & Benefits
- ✔ VIN-Programmed for Your Truck: Arrives flashed with the latest GM software specific to your vehicle, eliminating the need for expensive dealer programming.
- ✔ Restores Peak Performance: Corrects engine parameters to bring back the power and efficiency your 6.6L Duramax is known for.
- ✔ Direct-Fit Replacement: Engineered to be a perfect match for OEM part numbers 12658036 and 12667377 for a hassle-free installation.
- ✔ Resolves Communication Errors: Re-establishes the critical data link between your engine, transmission, and other vehicle modules.
- ✔ Cost-Effective Solution: A smart, reliable alternative to a costly and time-consuming dealership visit.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of a Properly Programmed ECM
As a technician, I’ve seen countless hours and dollars wasted trying to make a generic, unprogrammed module work. On modern diesel trucks like yours, the ECM is more than just a computer; it’s the command center that manages everything from fuel injection timing to transmission behavior and emissions systems. Our VIN-specific programming ensures that this 2015 Sierra 2500 ECM knows every specific option and calibration your truck left the factory with. This critical step prevents a host of post-installation headaches and ensures your vehicle operates exactly as GM intended.
Installation Notice: After you purchase, you must provide us with your vehicle’s VIN. Upon installation, a vehicle theft deterrent system relearn procedure is required. This is a standard security step for these vehicles and is the responsibility of the installer. Additional procedures, such as a crankshaft variation relearn, may also be necessary depending on your vehicle’s specific condition.
Frequently Asked Questions
What is a ‘theft deterrent relearn’ and why is it required?
The theft deterrent relearn is a security procedure that syncs your new ECM to your vehicle’s ignition key and Body Control Module (BCM). It’s a necessary step to allow the vehicle to start after the computer has been replaced. This procedure requires a compatible professional scan tool with access to GM’s programming system.
How do I provide my VIN?
After completing your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your ECM without it. The VIN is typically found on your driver’s side door jamb sticker or on the dashboard viewable through the windshield.
Is this compatible with my 6.6L Duramax?
This ECM is a direct fit for the 2015 model year Sierra 2500/3500, Silverado 2500/3500, and Express/Savana 2500/3500 vans equipped with the 6.6L diesel engine. It also fits certain 2014 van models. Please verify your original part number is 12658036 or 12667377 to ensure perfect compatibility.
Will this fix my check engine light?
If the check engine light is on due to an internal failure of the original ECM, this part will resolve the issue. However, if the light is caused by a separate faulty sensor or wiring problem, that issue will need to be addressed independently. This 2015 Sierra 2500 ECM will correctly process signals from all functioning sensors.
Do I need to send in my old computer?
No core charge or return is required for this part. You can purchase this unit outright without the hassle of sending your old one back.