Get Your Duramax Back on the Road, Fast.
When your Silverado, Sierra, or Express van is down, every minute costs you time and money. A faulty Engine Control Module (ECM) can bring your entire operation to a halt, causing frustrating issues like a no-start condition, poor performance, or confusing error codes. This is the definitive solution to get your workhorse back in service. This is a direct-fit Programmed 12658036 ECM, flashed with the latest official GM software specifically for your vehicle’s VIN.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing ECM is the likely culprit. This unit is designed to resolve these exact problems:
- Complete no-start or intermittent starting issues.
- Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs) such as U0100.
- Poor fuel economy or reduced engine power.
- Erratic transmission shifting or behavior.
- Apparent failure of multiple sensors at once.
Instead of wrestling with a blank module, this ECM arrives ready for installation. We handle the complex, bench-level programming, saving you a trip to the dealership and significant diagnostic time. Get back to the job with confidence, knowing your engine’s brain is fully restored.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with your truck’s exact VIN, ensuring seamless communication with other vehicle systems and eliminating compatibility guesswork.
- ✔ Latest GM Calibrations: Your ECM comes loaded with the most recent software updates from General Motors, guaranteeing optimal engine performance, fuel efficiency, and emissions compliance.
- ✔ Direct-Fit Replacement: This unit is a direct replacement for part numbers 12658036 and 12667377, ensuring a perfect physical fit in the factory location.
- ✔ Streamlined Installation: By pre-programming the module, we eliminate the most difficult step. Your technician’s job is simplified to physical installation and standard on-vehicle relearn procedures.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Importance of Correct Programming
From my 20 years of experience, I can tell you that an ECM is more than just a part; it’s the central command center of your vehicle. In modern Duramax-powered trucks, the ECM must communicate flawlessly with the Transmission Control Module (TCM), Body Control Module (BCM), and anti-theft system. Simply installing a used or non-programmed module will result in a no-start condition every time. Our professional programming service correctly marries this Programmed 12658036 ECM to your vehicle’s architecture, which is the critical first step to a successful repair.
Frequently Asked Questions
What information do you need from me?
After you complete your purchase, we will need the 17-digit Vehicle Identification Number (VIN) from your truck or van. This is essential for us to load the correct GM software and calibrations for your specific vehicle configuration.
Is this part truly plug-and-play?
It is ‘programmed-to-install.’ We handle the complex off-board programming. However, upon installation, your vehicle will require a security or ‘theft deterrent’ relearn procedure to sync this new ECM with your vehicle’s keys and security system. This is a standard procedure for any ECM replacement and must be performed by a technician with the appropriate scan tool or GM’s TIS2Web system.
What other relearns might be necessary?
Depending on the vehicle, additional procedures like a crankshaft position variation relearn or injector flow rate programming may be required to ensure peak performance. This is the responsibility of the installer and is a normal part of a professional ECM replacement.
Will this fix my truck’s problem for sure?
This ECM will correct any and all issues directly caused by a faulty engine computer. However, it is crucial that your vehicle has been properly diagnosed. This part will not fix problems related to faulty wiring, sensors, or other mechanical components.
Which vehicles does this ECM fit?
This module fits a range of 2014 and 2015 Chevrolet and GMC trucks and vans with the 6.6L Duramax diesel engine, including the Silverado 2500/3500, Sierra 2500/3500, Express 2500/3500, and Savana 2500/3500. Please verify your part number before ordering.