Is Your Hummer H3 Shifting Erratically or Stuck in Limp Mode?
A faulty transmission control module can sideline your 2008-2010 Hummer H3, turning a capable and rugged SUV into an unreliable vehicle. If you’re experiencing harsh gear changes, delayed engagement, or a frustrating check engine light, you’re not just losing performance—you’re losing the confidence to take your H3 wherever you want to go. This VIN-programmed T42 Transmission Control Module is the definitive solution to restore the crisp, dependable shifting your vehicle was built for.
Common H3 Shifting Problems & Your Solution
Don’t let a failing TCM dictate your drive. This module is the direct fix for a wide range of symptoms that indicate your original unit has failed. By replacing it, you can permanently resolve issues like:
- Abrupt, harsh, or unpredictable shifting between gears
- The vehicle being stuck in a single gear (limp mode)
- Transmission-related Check Engine Light or warning messages
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults
- A noticeable decrease in fuel economy due to inefficient shifting
- Complete failure to shift up or down
This isn’t just a replacement part; it’s a restoration of your H3’s core performance. As the brain of your automatic transmission, our 2008-2010 Hummer H3 Transmission Control Module ensures every command is executed flawlessly.
Features & Benefits
- ✔ Plug-and-Play Installation: This module arrives pre-programmed to your H3’s specific Vehicle Identification Number (VIN). No expensive trips to the dealership for programming are required. Simply install it, and you’re ready to go.
- ✔ Restored Drivability: By managing shift points, torque converter lockup, and line pressure with precision, this TCM eliminates jerky shifting and restores a smooth, factory-new feel to your transmission.
- ✔ Built for H3 Durability: Engineered to meet strict OEM specifications, this module is built to withstand the demanding conditions your Hummer was made for, from daily driving to challenging terrain.
- ✔ Clear stubborn Codes: Specifically designed to resolve persistent transmission-related DTCs that won’t clear with a standard scan tool, providing a lasting fix for your vehicle’s electronic issues.
- ✔ One-Year Protection: This unit is backed by our one-year replacement warranty, giving you confidence in your repair.
An Expert’s Take on Transmission Health
“For a vehicle like the Hummer H3, the transmission isn’t just about getting from A to B—it’s about capability. Whether you’re navigating a steep trail or merging onto a busy highway, you need to trust that your gearbox will respond instantly and correctly. A failing TCM compromises that trust. Installing a properly programmed 2008-2010 Hummer H3 Transmission Control Module is one of the most critical repairs you can make. It doesn’t just fix a symptom; it restores the vehicle’s fundamental reliability and ensures the 4L60E transmission operates exactly as GM engineers intended.”
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for a plug-and-play installation, saving you time and money.
Where is the TCM located on a 2008-2010 Hummer H3?
On the Hummer H3 from 2008 to 2010, the transmission control module is typically found in the engine compartment on the right-hand (passenger) side, near the rear of the engine bay.
Will this fix a P0700 trouble code?
Yes. The P0700 code is a general fault code indicating the TCM has detected a problem. A failing module is a very common cause, and replacing it with this pre-programmed unit is often the definitive solution to clear this and other related codes.
Is this a difficult part to install myself?
For someone with basic mechanical skills, the installation is straightforward and usually takes less than 30 minutes. It involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in its place. We recommend using a scan tool to clear any stored codes after installation is complete.
Do I need to send my old part back?
No, there is no core charge for this 2008-2010 Hummer H3 Transmission Control Module. You can keep or dispose of your old part without any hassle or additional fees.