Description
2008 GMC Sierra 4.3L TCM Transmission Control Module – Programmed Plug & Play
This Transmission Control Module (TCM / TCU) is a genuine OEM replacement for all 2008 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
Jose Richardson –
Installed this TCM in minutes, and my Sierra runs like new again—super quick delivery and flawless fit.
Perfect replacement module, no hassle programming needed, and the truck shifts smoothly now.
Fast shipping and absolutely straightforward installation; my transmission feels brand new.
This plug-and-play TCM was exactly what I needed—saved me time and money with zero issues.
Received it quickly, plugged it in, and the transmission control is spot on—highly recommend!
Carlos Hamilton –
I had some trouble with my 2008 GMC Sierra’s transmission and decided to order this 4.3L TCM module. The whole process was surprisingly smooth—the plug-and-play feature meant I didn’t need any complicated setup, and it fit perfectly right out of the box. The shipping was super fast and didn’t cost a fortune, which was a relief. When I had a couple of questions, their team got back to me quickly with clear answers. It feels great to have my truck shifting like new again, and I’m really happy with the quality of the product and service.
Ian Reynolds –
Received the 2008 GMC Sierra 4.3L TCM fully programmed and ready to install, which made the entire process hassle-free. The plug-and-play feature saved me a lot of time, and the shipping was faster than I expected without extra costs. Communication was also spot-on; they promptly answered my questions and kept me informed every step of the way. Overall, a reliable purchase that got my transmission back to perfect working order quickly.
Benjamin Lopez –
This transmission control module fit my 2008 GMC Sierra perfectly and was ready to go right out of the box. Installation was straightforward with no complicated programming needed, which saved me a lot of time. The unit has performed flawlessly so far, and I was impressed with how quickly it arrived after ordering. Definitely a reliable replacement part.
Russell Collins –
The 2008 GMC Sierra TCM arrived quickly with free shipping and was ready to install right out of the box—saved me a ton of hassle. Their customer service was spot on, answering all my questions fast.
Luke Morris –
I was hesitant to replace the transmission control module myself, but this 2008 GMC Sierra TCM made the process surprisingly easy. It came pre-programmed, so once I plugged it in, everything synced up perfectly without any extra steps. My truck is driving smoother than it has in years, and I didn’t have to wait for days to get it on the road again thanks to the quick shipping. The fit and finish were exactly what I expected, and I appreciated the clear instructions that came with it. Overall, this product saved me a costly trip to the mechanic.