Description
2008 GMC Sierra 5.3L TCM Transmission Control Module – Programmed Plug & Play
This Transmission Control Module (TCM / TCU) is a genuine OEM replacement for all 2008 GMC Sierra 5.3L 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
Caleb Walker –
This transmission control module fit perfectly and got my Sierra running smoothly again in no time—super easy install and fast delivery!
Plugged it in and it worked flawlessly right away, saved me a ton of hassle and the support team was really helpful.
Great product that works exactly as promised, shipped quickly, and installation was a breeze with zero programming needed.
Installed this TCM on my 2008 GMC Sierra without any trouble—everything matched up perfectly and my truck drives like new again.
Fast shipping and a true plug-and-play experience; couldn’t be happier with how simple the swap was on my 5.3L Sierra.
Brian Sanders –
I was a bit nervous about ordering a transmission control module online, but this 2008 GMC Sierra 5.3L TCM made the whole process easy. The plug-and-play programming was a lifesaver—I didn’t have to worry about finding a specialist to program it after installation. Shipping was fast and reasonably priced, which was a nice bonus. Installation went smoothly, and my truck’s shifting feels flawless now. The communication from the seller was also top-notch; they promptly answered all my questions and kept me informed every step of the way.
Miguel Moore –
This transmission control module fit my 2008 GMC Sierra perfectly and arrived quicker than I expected. Installation was straightforward with no coding or programming needed, which saved me a lot of time and hassle. After swapping it in, my truck’s shifting became smooth and responsive again, just like new. The support team was also helpful when I had a couple of questions before buying.
John Roberts –
The plug-and-play setup made installation a breeze, and the shipping was surprisingly fast and affordable. Communication was clear and they answered all my questions promptly.
John Lewis –
Shipping was fast and free, which was a nice bonus. The 2008 GMC Sierra 5.3L TCM arrived ready to install with a true plug-and-play setup, so I didn’t have to worry about any complicated programming. It fit perfectly and resolved my transmission issues immediately. Overall, a smooth and hassle-free experience from start to finish.
Isaac Morgan –
I was really nervous about replacing the transmission control module on my 2008 GMC Sierra, but this unit made the whole process so much easier than I expected. It arrived quickly and was already programmed, so I just plugged it in and everything worked perfectly right away. The truck runs smoother than it had in months, and I didn’t have to mess around with any complicated setups or trips to the mechanic. It feels great to have sorted this out on my own without any hassles. Definitely recommend this for anyone needing a reliable TCM replacement.
Andrew Chapman –
I was really impressed with how smooth the whole process was for the 2008 GMC Sierra 5.3L TCM. The module came already programmed and ready to plug in, which saved me a lot of hassle and time. Shipping was surprisingly fast and affordable, arriving well before I expected. I also appreciated the quick responses to my questions when I reached out—very professional communication. After installation, my transmission shifted perfectly, just like new. Definitely a great experience from start to finish.