Description
2008 GMC Sierra 4.8L TCM Transmission Control Module – Programmed Plug & Play
This Transmission Control Module (TCM / TCU) is a genuine OEM replacement for all 2008 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
Adam Murray –
I was really impressed with how quickly this TCM arrived, especially with free shipping included. The plug-and-play feature made installation straightforward, and my 2008 GMC Sierra shifted smoothly right away. The quality feels solid, and the whole process saved me a lot of time compared to having it repaired locally. Highly recommend for anyone needing a reliable transmission control module.
Neil Bailey –
I was really impressed with how easy the installation was on this 2008 GMC Sierra TCM. The plug-and-play setup meant I didn’t have to worry about programming it myself, which saved me a lot of time and hassle. Shipping was surprisingly quick and didn’t cost an arm and a leg either. Whenever I had a question, their support team responded promptly and clearly, which made the whole process stress-free. Since swapping this unit in, my transmission shifts smoothly, and I’m confident it was a quality replacement. Overall, a great experience from start to finish.
Diego Ramirez –
I was really impressed with how straightforward the installation was on this TCM module. It arrived quickly and fit perfectly with no extra programming needed, which saved me a ton of time. My 2008 GMC Sierra runs smoother now, and the shifting issues I was having are completely resolved. The product quality feels solid, and the support team was helpful when I had a couple of questions before ordering.
Eric Ward –
Fast shipping and the plug-and-play setup made replacing my 2008 GMC Sierra TCM a breeze. The transmission shifts perfectly now!
Hunter Clark –
Installed the TCM in my 2008 Sierra with zero hassle—worked perfectly right out of the box and shipped faster than expected. Highly recommend!
This plug-and-play module saved me a trip to the dealer and got my truck shifting smoothly again immediately. Great product!
Super impressed with how quick and simple the installation was. The programmed module fits perfectly and my truck runs like new.
Fast delivery and the TCM was ready to go right away—no programming needed. It fixed my transmission issues without any stress.
Had doubts at first, but this transmission control module was exactly as described and made my Sierra drive flawlessly again. Very satisfied!