Get Your Duramax Back to Full Strength
When the engine control module in your heavy-duty GM truck or van fails, your work grinds to a halt. A faulty ECM can cause a frustrating range of issues, from a no-start condition to poor performance and confusing check engine lights. This Engine Control Module, compatible with part numbers 12667377 and 12658036, is the definitive, reliable solution to get your 6.6L Duramax engine running correctly and restore your confidence on the road and at the job site.
We take the guesswork out of the repair. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash this module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and restores your engine’s original performance and efficiency. By using a precisely configured unit like this Programmed 6.6L Duramax ECM 12667377, you avoid the common pitfalls and compatibility headaches of using a generic, non-programmed module.
Common Symptoms & Your Solution
If your truck is experiencing any of the following, a failing ECM is a likely culprit:
- Complete no-start or intermittent starting issues
- Check Engine Light with communication-related DTCs (e.g., U0100) or internal processor codes (P0606)
- Poor fuel economy and reduced engine power
- Erratic shifting or transmission performance issues
- Stalling or rough idling
This pre-programmed ECM is designed to be the core of your repair, directly addressing these symptoms and restoring the critical communication between your engine’s sensors and systems.
Features & Tangible Benefits
- ✔ VIN-Specific Programming: We flash the module to your exact VIN, ensuring it works seamlessly with your truck’s specific options and systems right out of the box.
- ✔ Latest GM Calibrations: Your ECM arrives with the newest official software, providing improvements in performance, fuel efficiency, and emissions control.
- ✔ Direct-Fit Replacement: Engineered to match the original form and function of part number 12667377 for a straightforward installation process.
- ✔ Restored Dependability: Eliminate frustrating electrical gremlins and trust your truck to perform day in and day out, just as it was designed to.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Importance of Correct Programming
A modern 6.6L Duramax is an incredibly complex powertrain. The ECM acts as its central nervous system, managing everything from fuel injection timing and turbo boost to transmission shifting and emissions equipment. Unlike older vehicles, you can’t simply swap in a used computer. Each module is coded to the vehicle’s specific VIN and options. Our professional programming service ensures this critical link is perfectly re-established, preventing potential conflicts with the BCM, TCM, and other modules that could lead to persistent issues or even a non-running vehicle after installation. This is the key to a successful, long-lasting repair.
Frequently Asked Questions
Why do you need my VIN?
Your vehicle’s 17-digit Vehicle Identification Number (VIN) contains crucial information about its engine, transmission, and factory-installed options. We use the VIN to load the exact GM-specified software and calibrations onto the Programmed 6.6L Duramax ECM 12667377, ensuring it is a perfect match for your truck.
What is a ‘theft relearn’ and will I need to do one?
The Vehicle Theft Deterrent (VTD) system syncs the ECM to your vehicle’s ignition key and other security modules. Upon installation, if the truck won’t start, a VTD relearn is necessary to sync this new ECM. This is a standard procedure that can be performed with a compatible high-level scan tool or by a qualified technician using the GM programming system (tis2web). This is the responsibility of the installer.
Will any other ‘relearns’ be necessary?
Depending on your specific vehicle, additional procedures like a crankshaft position variation relearn or injector flow rate programming may be required after installation to ensure optimal performance. These are standard procedures for this type of repair and should be performed by the installer.
Does this part require a core return?
No, there is no core charge or need to return your old module. This allows you to get your vehicle repaired faster without the hassle of shipping a core back.
Which part numbers does this unit replace?
This ECM is a direct replacement for part numbers 12667377 and 12658036. Please verify one of these numbers on your original module before ordering.
How long does the programming process take?
Once you provide your VIN, programming is typically completed within 1-2 business days before the part is shipped to you. We prioritize accuracy to ensure you get the right software for your truck.