Description
2020 GMC Sierra 6.6L ECM / ECU – VIN Programmed | Updated
This Engine Control Module (ECM / ECU) is a genuine OEM replacement for all 2020 GMC Sierra 6.6L models.
Each unit is VIN-programmed, updated, and fully tested for a true plug-and-play installation with no dealer visit required.
Built to OEM standards for reliability, calibration accuracy, and long-term performance.
Strict Testing & Quality Assurance
Every ECU is inspected, refreshed, and verified through advanced diagnostic tools. Testing includes:
Complete communication & CAN-bus verification
Sensor input/output and signal integrity checks
Injector & ignition pulse simulation
Power, ground, and load-circuit analysis
Flash memory integrity and checksum validation
Thermal and voltage-stress testing to confirm reliability
This ensures a fully functional, reliable, plug-and-play module you can install with confidence.
Important Note
Some vehicles with IMMO or PATS may require key programming after installation. This is normal.
For a 100% plug-and-play solution with no relearns, your original ECU must be sent in for cloning. We transfer all security data to the replacement unit.
👉Add the cloning service as a bundle at checkout — $200 CAD / $140 USD
A prepaid shipping label will be emailed to you.
If cloning is not selected, the ECU will be VIN programmed, and a key relearn will be required after installation.
Contact Us
Email: info@fixecm.com
Phone: Local: 647-247-8555 | Toll-Free: 1-800-915-5566
Michael Turner –
I was a bit nervous about replacing the ECM on my 2020 GMC Sierra, but this unit arrived already programmed to my VIN, which made the whole process so straightforward. Installation was truly plug-and-play; it took me less than an hour from start to finish. The truck fired right up without any issues, and I immediately noticed smoother performance and better responsiveness. Shipping was surprisingly quick too, which was a huge relief since I needed it replaced ASAP. If you’re worried about complicated setups, this part makes it almost effortless. Definitely a five-star experience from start to finish!
Cooper Perez –
Installed this 6.6L ECM in my 2020 Sierra with zero hassle—perfect fit and runs flawlessly right out of the box. Shipping was quick, and the truck feels like new again!
Jack Rogers –
I was impressed with how straightforward the install was on the 2020 GMC Sierra ECM. It arrived quickly and was already programmed to my truck’s VIN, which saved me a ton of hassle. After swapping it in, everything fired up perfectly without any error codes. Definitely a reliable option if you want a seamless replacement without dealing with complicated setup.
Travis Taylor –
I was pretty nervous about replacing the ECM on my 2020 GMC Sierra, but this unit made the whole process way easier than I expected. It arrived quickly and was already programmed with my VIN, so I didn’t have to mess with any complicated setup. The install was truly plug and play—just swapped it in, and the truck fired right up without any issues. Since then, everything has been running smoothly with no check engine lights or glitches. Definitely saved me a trip to the dealer and a bunch of downtime. Highly recommend this for anyone needing a reliable ECM replacement!