Description
2008 Chevrolet Avalanche 5.3L TCM Transmission Control Module – Programmed Plug & Play
This Transmission Control Module (TCM / TCU) is a genuine OEM replacement for all 2008 Chevrolet Avalanche 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
Brandon Miller –
I purchased the 2008 Chevrolet Avalanche 5.3L TCM Transmission Control Module, and I was really impressed with how straightforward the plug-and-play setup was. The unit arrived quickly with free shipping, which was a nice bonus. The quality feels solid, and the vehicle shifted smoothly right after installation without any issues. Communication with the seller was clear, and they answered all my questions promptly.
Cooper Page –
Bought the 2008 Avalanche TCM and it arrived fast with free shipping—plug-and-play setup was seamless and saved me a ton of hassle.
Noah Peterson –
This TCM was a perfect fit for my 2008 Avalanche and installed effortlessly—had it up and running in no time! Super fast shipping and no hassles at all.
Liam Rogers –
I installed the 2008 Chevy Avalanche TCM module myself, and it fit perfectly without any extra programming needed. The shipping was surprisingly quick, and the instructions were clear, making the whole process smooth. Since putting it in, my transmission shifts have been noticeably smoother, and the check engine light hasn’t come back on. Definitely a quality replacement that saved me a trip to the shop.
This transmission control module was exactly what my 2008 Avalanche needed. It came pre-programmed, so I just plugged it in and everything worked right away—no hassle at all. The responsiveness of the transmission improved immediately, and the whole installation only took about 30 minutes. Customer service was also helpful when I had a quick question about compatibility, which gave me extra confidence in the purchase.
I was a bit nervous about replacing the transmission control module on my Avalanche, but this unit made it straightforward. It arrived much faster than expected, and since it was already programmed, I simply swapped it in and
Dominic Richardson –
I was having serious issues with my 2008 Chevy Avalanche’s transmission, and after some research, I decided to try this TCM module. The plug-and-play setup made the entire replacement way easier than I expected—no confusing programming or extra trips to the shop. Shipping was really quick and free, which was a nice bonus. After installing it, my transmission shifted smoothly again, just like new. The whole process saved me a lot of time and hassle, highly recommend.