Restore Your H3’s Legendary Performance
Is your Hummer H3 shifting erratically, hesitating between gears, or stuck in limp mode? A failing Transmission Control Module (TCM) can undermine the rugged capability and confidence you expect from your vehicle. This professionally programmed T42 TCM is the definitive solution, designed to restore the crisp, decisive shifting and bulletproof reliability your H3 was built for. Shipped pre-programmed to your vehicle’s specific VIN, it eliminates the need for expensive dealership visits and gets you back on the road—or the trail—with confidence.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty TCM is the most likely culprit. This module is engineered to be the direct, permanent fix for:
- Harsh, jerky, or delayed gear shifts
- The vehicle being stuck in a single gear (limp mode)
- An illuminated Check Engine Light or Transmission Warning Light
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0755, or other solenoid-related faults
- Poor acceleration and decreased fuel economy
- Complete failure to shift gears
Installing this pre-programmed Hummer H3 transmission control module is the most effective way to resolve these problems and restore your vehicle’s transmission to its original factory performance.
Features & Benefits
- ✔ Plug & Play Installation: Arrives pre-programmed to your H3’s VIN. No additional programming or dealer trips are required—just install it and go.
- ✔ Restore Smooth Shifting: Eliminates harsh engagement and gear hunting by precisely managing shift points, line pressure, and torque converter lockup.
- ✔ Clear Stubborn Codes: Specifically designed to resolve common transmission-related DTCs and turn off the check engine light for good.
- ✔ Built for Durability: Constructed to meet and exceed strict OEM quality standards, ensuring long-lasting performance in all driving conditions.
- ✔ This unit is backed by our one-year replacement warranty.
- ✔ No Core Charge: Keep your old part without the hassle or expense of a core return, saving you time and money.
Expert Insight: Why VIN Programming is Non-Negotiable
In a modern vehicle like the Hummer H3, the TCM doesn’t just manage the transmission; it communicates constantly with the Engine Control Module (ECM) and other vehicle systems. A generic, non-programmed module can’t speak this unique language, leading to persistent performance issues. Our VIN-specific programming loads the exact software and calibrations your H3 left the factory with. This ensures every component works in perfect harmony, delivering the solid, dependable performance you demand from your Hummer H3 transmission control module.
Frequently Asked Questions
What does a TCM do on a Hummer H3?
The Transmission Control Module, or TCM, is the electronic brain of your automatic transmission. It collects data from various sensors on the engine and transmission to control shift timing, fluid pressure, and torque converter operation for optimal performance and fuel efficiency.
Is this module difficult to install?
Installation is straightforward for a DIYer with basic tools. On the 2008-2010 Hummer H3, the TCM is typically located in the engine compartment on the right-hand rear side. The process usually takes under 30 minutes. Simply disconnect the battery, unbolt the old module, disconnect the wiring harnesses, and install the new one.
Will this fix a P0700 trouble code?
Yes. A P0700 code is a general fault code indicating the TCM has detected a problem. This pre-programmed Hummer H3 transmission control module is a common and effective solution for P0700 and many other related transmission codes.
Do I need to take my H3 to a dealer after installation?
No. Because this module is pre-programmed to your vehicle’s VIN, it is ready for immediate installation and operation. You will not need to pay for any additional programming or calibration at a dealership or repair shop.
Is a core charge required for this part?
No, there is no core charge. You can keep your old module without needing to send it back, which simplifies the repair process for you.