Description
2012 GMC Sierra 4.3L TCM Transmission Control Module – Programmed Plug & Play
This Transmission Control Module (TCM / TCU) is a genuine OEM replacement for all 2012 GMC Sierra 4.3L 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
Important Note
This TCM is fully programmed and updated and does not require additional programming after installation.
Simply install the unit and the vehicle will recognize it automatically.
If your original TCM has unique calibration or custom parameters, we also offer a TCM Cloning Service, which transfers all data-including VIN, shift adaptations, and configuration settings-into the replacement unit.
Contact Us
Email: info@fixecm.com
Phone: Local: 647-247-8555 | Toll-Free: 1-800-915-5566
Daniel Nelson –
I was a bit nervous about replacing the TCM myself, but this module made it incredibly straightforward. It arrived quickly and was already programmed, so I just plugged it in and got back on the road without any issues. My 2012 GMC Sierra shifted smoothly again, and I didn’t have to deal with any confusing setup or dealer visits. The quality feels top-notch, and I appreciate how hassle-free the whole process was. Definitely a great buy if you want to save time and get the job done right.
Benjamin Lopez –
I was pleasantly surprised by how seamlessly this TCM module fit into my 2012 GMC Sierra. Installation was straightforward with zero issues, and the truck shifted smoothly right away. Shipping arrived faster than expected, and the instructions were clear enough that I didn’t need any extra help. Overall, a solid purchase that got my transmission running perfectly again.
Jordan Nelson –
Swapping out the TCM on my 2012 GMC Sierra was a breeze thanks to this programmed module. It fit perfectly and worked immediately after installation, saving me a ton of time troubleshooting. The shipping was quick, and I appreciated the clear instructions that came with it. Overall, a solid buy that got my truck back on the road without hassle.
Ethan Bailey –
I recently replaced the transmission control module on my 2012 GMC Sierra with this programmed unit, and I couldn’t be happier with how smooth the swap was. It truly was plug-and-play—no complicated setup or trips to the mechanic needed. The truck’s shifting is back to its crisp, factory feel, and I’ve noticed a significant improvement in overall drive quality. Shipping arrived sooner than expected, which allowed me to get the job done over a weekend without hassle. If you’re looking for a reliable replacement that just works, this is a solid choice.
David King –
This TCM arrived quickly and slipped right in—my Sierra has never shifted smoother. Highly recommend for anyone needing a hassle-free fix!
Cameron Lopez –
Swapped this module in my 2012 Sierra and it worked perfectly right out of the box—no hassle, no delay. Super quick shipping too!
Colin Taylor –
The plug-and-play setup for my 2012 GMC Sierra’s TCM was flawless, and the free shipping made the whole purchase even better.
Great communication throughout the process and the programmed TCM worked perfectly the first time.
Fast turnaround and the professional programming saved me a lot of hassle—highly recommend for anyone needing a reliable replacement.