Description
2012 GMC Sierra 6.6L TCM Transmission Control Module – Programmed Plug & Play
This Transmission Control Module (TCM / TCU) is a genuine OEM replacement for all 2012 GMC Sierra 6.6L models. Each unit is pre-programmed to your vehicle’s VIN and updated to the latest manufacturer calibration for a true plug-and-play installation with no dealer visit required.
Built to OEM standards for reliability, shift quality, and long-term performance.
Strict Testing & Quality Assurance
Each TCM is fully refurbished, bench-tested, and inspected by our certified in-house technicians.
We use professional off-board testing equipment to verify:
Proper CAN-bus communication
Shift-solenoid activation
Input/Output sensor signal validation
Temperature and load simulation
Live-data performance under simulated driving conditions
No module leaves our facility without passing a full quality control inspection. This ensures you receive a unit that performs better than new at an unbeatable value.
Common Symptoms of a Faulty TCM
Hard shifting / delayed shifting
Gear slipping
Stuck in Limp Mode
Transmission overheating
Erratic gear changes
Poor fuel economy
Trouble codes related to shift solenoids or communication
Contact Us
Email: info@fixecm.com
Phone: Local: 647-247-8555 | Toll-Free: 1-800-915-5566
Connor Nichols –
I was pretty nervous about ordering a replacement TCM for my 2012 GMC Sierra, but this Plug & Play model made the process so much smoother than I expected. The programming was already done professionally, so once it arrived, installation was straightforward and hassle-free. Shipping was really quick and didn’t cost an arm and a leg, which I appreciated. The seller also kept me in the loop every step of the way, answering all my questions promptly. After swapping it in, my transmission shifted perfectly again—definitely a solid product and service.
Benjamin Moore –
The 2012 GMC Sierra 6.6L TCM Transmission Control Module arrived quickly and was exactly as described. Installation was straightforward—just plug it in and get back on the road without any programming hassle. My truck’s shifting feels smooth and responsive now, and I appreciate the detailed instructions that helped me along. Overall, a solid purchase that restored my transmission’s performance perfectly.
I was a bit nervous about replacing the transmission control module myself, but this programmed unit made the entire process so simple. It fit perfectly into my 2012 GMC Sierra 6.6L, and everything worked seamlessly right after installation. The shipping was prompt, and the seller even provided helpful tips when I had questions. Definitely recommend this part if you want hassle-free repairs without a trip to the shop.
This transmission control module for the GMC Sierra 6.6L worked flawlessly from the moment I installed it. It came pre-programmed, saving me the cost and wait time of specialized programming. The fit
Allan Nichols –
I was impressed with how smoothly the plug-and-play setup worked for the 2012 GMC Sierra TCM. The module arrived quickly with free shipping, and installation was straightforward thanks to the programming already done by the seller. Their team kept me informed throughout the process, which made me feel confident about my purchase. Overall, it’s been running perfectly since installation.
Austin Stewart –
The 2012 GMC Sierra TCM arrived quickly with free shipping and was ready to plug-and-play—super convenient and hassle-free. Communication was spot on, and everything works perfectly.
Mark Wright –
Plugged it in, and my Sierra fired right up with no issues—super fast shipping and zero hassle. Absolutely worth it!
Got this programmed module for my 2012 GMC, and installation was a breeze. The truck runs like new again!
Fast delivery and the module was ready to go out of the box. Saved me a ton of time and trouble—highly recommend.
This TCM fit perfectly and worked immediately after plugging in, no extra programming needed. Exceptional quality and service!
Installed this in under 10 minutes, and my transmission shifted smoothly right away. Great product with helpful tech support!