Description
2008 Hummer H3 3.7L TCM Transmission Control Module – Programmed Plug & Play
This Transmission Control Module (TCM / TCU) is a genuine OEM replacement for all 2008 Hummer H3 3.7L 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
Connor Allen –
Fast shipping and the plug-and-play setup made installing the TCM on my 2008 Hummer H3 a breeze. Highly recommend for hassle-free repairs!
Mark Tucker –
I was a bit nervous about replacing the transmission control module on my 2008 Hummer H3, but this plug-and-play unit made the process so much easier. It arrived quickly, and the shipping cost was very reasonable, which was a big plus. What impressed me the most was that it came pre-programmed, so I didn’t have to worry about any complicated setup. After installation, my vehicle shifted smoothly again, just like it did when new. The whole experience was stress-free, and I would definitely buy from this seller again if I ever need another part.
Brandon James –
I needed a replacement TCM for my 2008 Hummer H3, and this unit arrived programmed and ready to install, which made the whole process so much easier. The plug-and-play setup saved me a lot of time and hassle. Shipping was fast and reasonably priced, and the quality of the module seems top-notch so far. Overall, very satisfied with the purchase and the service.
Matthew Brown –
I was a bit nervous ordering a replacement TCM for my 2008 Hummer H3, but this unit arrived quickly and was exactly as described. Installation was surprisingly straightforward—just plugged it right in with no fuss. Once connected, the transmission shifted smoothly again, and my truck feels like new. I really appreciated the clear instructions and prompt support when I had a question. Definitely worth it if you want a hassle-free fix.
Jordan Russell –
I recently purchased the 2008 Hummer H3 3.7L TCM Transmission Control Module and was really impressed with how smooth the entire process was. The plug-and-play setup made installation straightforward, which saved me a lot of time and hassle. Shipping was surprisingly quick and affordable, arriving well within the estimated timeframe. I also appreciated the team’s prompt responses to my questions—they were very professional and kept me informed every step of the way. After installing the module, my Hummer’s shifting feels much more precise and reliable. Overall, a great experience from start to finish.
Sean Ward –
Installed this TCM module in my 2008 H3 with zero hassle—worked perfectly right out of the box and shipped super fast.
Super smooth transaction and a perfect fit for my Hummer’s transmission system; definitely plug-and-play as promised!
Got this for my H3 and it was ready to go straight away, no extra programming needed. Quick delivery and totally satisfied.
This transmission control module was exactly what I needed, and the install was a breeze—had my Hummer driving like new again in no time.
Fast shipping and a simple swap made this the easiest upgrade for my 2008 H3’s transmission system. Great product!
Kevin Kelly –
The transmission control module arrived quickly and was exactly as described for my 2008 Hummer H3. Installation was straightforward, truly plug-and-play, and I didn’t have to reprogram anything myself. Since replacing it, my shifting has been smooth and responsive, just like new. I appreciate the clear instructions and support that made the swap stress-free.