Description
2012 GMC Sierra 4.8L TCM Transmission Control Module – Programmed Plug & Play
This Transmission Control Module (TCM / TCU) is a genuine OEM replacement for all 2012 GMC Sierra 4.8L 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
Caleb Brooks –
The plug-and-play setup was flawless, and the free shipping made the whole process hassle-free. I’m very happy with how quickly everything arrived!
James Perez –
This TCM fit my 2012 GMC Sierra perfectly and installed in minutes—no hassle at all! Shipping was quick, and the truck shifts smoother than ever.
Liam King –
The 2012 GMC Sierra TCM arrived quickly and was ready to install right out of the box, which saved me a lot of hassle. It fit perfectly and worked exactly as expected, fixing the transmission issues my truck had been experiencing. I appreciated the clear instructions that made the plug-and-play setup seamless. Overall, a solid, reliable part that’s definitely worth it for anyone needing a replacement module.
Travis Cox –
I was a bit nervous about replacing the TCM on my 2012 GMC Sierra, but this programmed module made the whole process so much easier than I expected. It arrived quickly and everything fit perfectly without needing any extra work or coding on my end. Once installed, my transmission shifted smoothly again like it was brand new. The quality feels solid and I really appreciate how straightforward the plug-and-play setup was. Definitely saved me a trip to the mechanic and a lot of hassle. Highly recommend for anyone needing a reliable fix!
Isaac Stewart –
The 2012 GMC Sierra 4.8L TCM module arrived quickly and was already programmed, which made the installation super straightforward. It fit perfectly and worked right out of the box, no hassle or extra coding needed. My truck shifts smoothly again, and I’m really happy with how seamless the whole process was. Definitely a reliable replacement if your transmission control starts acting up.
Brandon Lopez –
Got my 2012 GMC Sierra running smooth again in no time—installation was straightforward and it shipped super fast. Highly recommend for anyone needing a reliable TCM replacement!