Restore Your Hummer’s Dominant Performance
A Hummer H3 is built for command and capability, but a failing transmission control module can bring it to a grinding halt. If you’re dealing with harsh shifting, dashboard warning lights, or a vehicle stuck in limp mode, you’ve found the definitive solution. This T42 Transmission Control Module is pre-programmed to your H3’s specific VIN, ensuring a perfect, plug-and-play fix that restores the rugged, dependable performance you expect.
Common Symptoms & Your Solution
A faulty TCM can manifest in several frustrating ways. This module is the direct solution if you’re experiencing:
- Harsh, erratic, or delayed gear shifts
- The vehicle being stuck in a single gear (limp mode)
- Check Engine Light or Transmission Warning Light illumination
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes
- A complete failure to shift up or down
- Poor fuel economy and potential transmission overheating
Installing our precisely programmed 2008-2010 Hummer H3 transmission control module is the most effective way to permanently resolve these issues and get your truck operating flawlessly again.
Features & Benefits
- ✔ Precision VIN Programming: We program this module to your vehicle’s exact VIN before shipping. This means it arrives ready for installation with the latest GM software, eliminating the need for expensive dealership programming and ensuring optimal shift patterns and performance from the moment you install it.
- ✔ Restored Drivability: By taking precise control over gear shifts, torque converter lockup, and line pressure, this TCM restores the smooth, predictable operation your H3 had from the factory.
- ✔ Built to Last: Manufactured to strict OEM standards, this module is designed for durability and resilience, ready to handle the demands of daily driving or off-road adventures.
- ✔ Clear Communication: This module is the solution for clearing persistent transmission-related DTCs and ensuring your vehicle’s onboard diagnostic systems function correctly.
- ✔ Peace of Mind Protection: This unit is backed by our one-year replacement warranty.
Expert Insight: Why VIN Programming is Non-Negotiable
The 4L60E/4L70E series transmissions in your Hummer H3 are sophisticated pieces of equipment. A generic, non-programmed module from a local parts store simply can’t account for the specific variables of your vehicle—like tire size, axle ratio, and engine parameters. This often leads to persistent shifting problems or even new error codes. Our VIN-specific programming ensures the 2008-2010 Hummer H3 transmission control module communicates flawlessly with your vehicle’s entire network, providing a reliable, long-term solution, not just a temporary patch.
Frequently Asked Questions
What does a T42 TCM do in my Hummer H3?
The Transmission Control Module (TCM) is the electronic brain of your automatic transmission. It receives data from various sensors and uses it to control shift solenoids, regulate hydraulic pressure, and manage the torque converter, ensuring smooth and efficient gear changes.
Is this a plug-and-play part?
Yes. Because we pre-program the module to your vehicle’s VIN, it is ready for immediate installation without any further programming or trips to a dealership. Simply install the part, disconnect the battery for 15 minutes to clear any adaptive memory, and you’re ready to go.
Will this fix my check engine light and transmission codes?
Absolutely. This module is designed to resolve the root electronic cause of common transmission-related Diagnostic Trouble Codes (DTCs) like P0700. Once installed, the codes can be cleared, and they should not return.
Where is the TCM located on a 2008-2010 H3?
On the 2008-2010 Hummer H3, the transmission control module is typically located in the engine compartment on the right-hand (passenger) side, towards the rear of the compartment.
Do I need to return my old part?
No. We do not require a core return for this part. You can keep or dispose of your old module without any core charges or hassle.
Why should I choose this over a used part?
A used module carries the risk of having the same internal faults as your current one and will be programmed for a different vehicle, causing compatibility issues. Our 2008-2010 Hummer H3 transmission control module is a dependable component loaded with fresh, vehicle-specific software and backed by a warranty for total confidence.