Description
2008 Hummer H3 5.3L TCM Transmission Control Module – Programmed Plug & Play
This Transmission Control Module (TCM / TCU) is a genuine OEM replacement for all 2008 Hummer H3 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
Liam Taylor –
The 2008 Hummer H3 TCM module arrived quickly and was exactly as described. Installation was straightforward—just plugged it in and it worked immediately without any hiccups. After swapping it out, my transmission shifted noticeably smoother, and I’m really happy with the performance boost. Customer support was also helpful when I had a couple of questions, which made the whole process stress-free.
Allan King –
I needed a replacement TCM for my 2008 Hummer H3 5.3L, and this unit arrived ready to install with the programming already done, which saved me a ton of hassle. The plug-and-play setup worked perfectly right out of the box, and my transmission shifted smoothly afterward. Shipping was super fast and reasonably priced, making the whole process stress-free. I also appreciated how they kept me informed throughout the order and shipping process.
Michael Bailey –
The plug-and-play setup was flawless, and the free shipping made the whole process hassle-free and quick.
Travis Scott –
I had been struggling with shifting issues on my 2008 Hummer H3 for a while, so I decided to try this transmission control module. Installing it was surprisingly straightforward—just plugged it in and everything worked perfectly right away. The difference in transmission response is night and day, and I’m really impressed with how smooth my drives have become since the swap. Shipping was quick, and the seller even answered some of my questions promptly before I bought it. Definitely a solid purchase that saved me from a costly repair at the shop.
Scott Brooks –
Installed this TCM module in my 2008 Hummer H3 with zero hassle—fast shipping and it worked perfectly right out of the box. Highly recommend!
Super quick delivery and the plug-and-play setup made swapping the transmission control module a breeze. My H3 runs smoother than ever!
This module fit my Hummer perfectly and was ready to go immediately—no programming needed, which saved me tons of time. Great product!
Got my 2008 H3 back on the road in no time thanks to this pre-programmed TCM. Shipping was fast and installation was straightforward.
Exactly what I needed for my Hummer’s transmission issue. Plugged it in, and everything worked flawlessly without any extra fuss.
Neil Johnson –
I recently purchased the 2008 Hummer H3 5.3L TCM Transmission Control Module, and I’m really impressed with how smooth the whole process was. The module arrived quickly and was programmed to work perfectly with my vehicle—plug-and-play made installation a breeze. What stood out most was how responsive the seller was; they answered all my questions promptly and kept me updated every step of the way. After swapping it out, my transmission shifts feel much smoother, and I couldn’t be happier with the quality of the repair. Definitely a great experience buying from this site.