Get Your H3 Back in Action with a Dependable Transmission Brain
Is your 2008-2010 Hummer H3 suffering from erratic shifting, getting stuck in gear, or flashing transmission warning lights? A failing Transmission Control Module (TCM) is often the culprit, crippling your truck’s legendary capability. Don’t let a faulty computer sideline your H3. This professionally programmed T42 TCM is the definitive, plug-and-play solution to restore your transmission’s performance and get you back on the road with confidence. By installing our expertly configured Hummer H3 transmission control module, you’re not just replacing a part—you’re restoring the reliability and rugged performance you expect.
Common Symptoms & Your Solution
A bad TCM can cause a cascade of frustrating and potentially damaging issues. If you’re experiencing any of the following, this module is your answer:
- Harsh, delayed, or unpredictable gear shifts
- The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear)
- Check Engine Light or transmission warning lights are on
- Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults
- Complete failure to shift up or down
- Noticeably poor fuel economy and transmission overheating
This module directly replaces OEM service numbers including 24242391, 24234503, and 24252114, providing a reliable fix that communicates flawlessly with your H3’s powertrain.
Key Features & Tangible Benefits
- ✔ VIN-Programmed for Your H3: We program this module to your vehicle’s specific VIN before shipping. This ensures perfect compatibility and function right out of the box, eliminating the need for an expensive trip to the dealership for programming.
- ✔ Restores Smooth Shifting: By precisely managing shift points, torque converter lockup, and line pressure, this TCM brings back the crisp, predictable shifting your transmission was designed for.
- ✔ Eliminates Fault Codes: A correctly programmed and functioning module resolves the root cause of many common transmission-related DTCs, allowing you to clear those persistent dashboard lights.
- ✔ Built for Durability: Constructed to meet or exceed strict OEM standards, this module is designed to withstand the demanding conditions your Hummer was built to handle.
- ✔ This unit is backed by our one-year replacement warranty.: Drive with peace of mind knowing your purchase is protected against defects.
Expert Insight: The Power of Pre-Programming
In modern vehicles like the Hummer H3, the TCM isn’t just a simple switch; it’s a sophisticated computer that’s integrated with the engine controller, ABS, and other systems. Simply installing a generic, non-programmed module will not work and can even cause further issues. Our VIN-specific programming loads the exact software and calibration files your truck left the factory with, ensuring all systems communicate correctly from the moment you plug it in. This is the secret to a successful, hassle-free repair that saves you hundreds in dealership labor and diagnostic fees.
Frequently Asked Questions
What does this Hummer H3 transmission control module do?
The TCM acts as the brain for your automatic transmission. It receives data from various sensors on the vehicle and uses that information to control exactly when and how the transmission shifts gears, ensuring optimal performance, fuel efficiency, and durability.
Is installation difficult?
No, installation is quite straightforward for someone with basic mechanical skills. The TCM is located in the engine compartment (RH rear side on the H3). The process involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in reverse order. It typically takes less than 30 minutes.
Do I need to take my truck to the dealer after installation?
Absolutely not. The primary benefit of our service is that this module arrives pre-programmed to your Hummer’s VIN. This allows you to skip the expensive and time-consuming programming procedure required at a dealership, making it a true plug-and-play solution.
Will this fix my ‘limp mode’ problem?
In the vast majority of cases, yes. “Limp mode” is a protective measure triggered by the vehicle’s computer when it detects a serious transmission fault. A failing TCM is one of the most common causes. Replacing it with this properly functioning unit should restore full transmission operation.
Is there a core charge for my old part?
No, there is no core charge required for this part. You can keep or dispose of your old module without the hassle of returning it.