Is your 2008-2010 HUMMER H3 struggling with erratic shifting, getting stuck in gear, or throwing transmission codes? As a technician with over two decades of experience, I’ve seen these symptoms countless times, and the culprit is often a failing Transmission Control Module (TCM). A faulty TCM can make your rugged H3 feel unpredictable and unreliable, both on and off the road. This isn’t just an annoyance; it’s a critical failure that compromises performance and safety. Stop guessing and replace the brain of your transmission with a dependable, VIN-programmed solution.
This is a direct-fit T42 Transmission Control Module for your HUMMER H3, part number 24235753. We take the guesswork and dealership hassle out of the equation. Before we ship it, we program the module to your vehicle’s specific VIN, ensuring it communicates flawlessly with your engine and transmission right out of the box. This restores the precise, smooth shifting and reliable performance you expect from your vehicle’s 4L60E-series automatic transmission.
A Technician’s Notebook: The Limp Mode H3
A customer brought in his 2009 H3, frustrated because it was stuck in what he called ‘crawler gear’—what we know as limp mode (stuck in 3rd gear). He couldn’t go over 40 MPH, and the check engine light was on. His scanner showed a P0700 (Transmission Control System Malfunction). After checking the basics like fluid level and connectors, we pinpointed the TCM. Instead of a costly and time-consuming trip to the dealer, he opted for one of our pre-programmed modules. Less than an hour after it arrived, he had it installed himself, cleared the codes, and his H3 was shifting perfectly again. It’s a textbook fix for a very common GM issue.
Is Your HUMMER H3 Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Often, it starts with subtle electrical gremlins. If you’re experiencing any of the following, your TCM is the likely cause:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Vehicle is stuck in limp mode (usually 2nd or 3rd gear) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750-series solenoid codes, or communication errors.
- ✔ A sudden drop in fuel economy or the transmission seems to be overheating.
- ✔ Complete loss of communication with the transmission.
Your 30-Minute Installation Guide
Replacing the 2008-2010 HUMMER H3 TCM is a straightforward job that most DIYers can handle in their own driveway. No special tools are needed.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On the 2008-2010 HUMMER H3, the TCM is typically located in the engine bay, on the right-hand (passenger) side rear of the compartment.
- Disconnect and Remove: Carefully unclip the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in place and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any lingering fault codes from the ECU. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24235753 and other interchangeable numbers. It is guaranteed to fit the following models and configurations:
- HUMMER H3 2008-2010: Transmission; (RH rear engine compartment)
- Chevrolet Colorado 2008-2012: Transmission; (RH rear engine compartment)
- GMC Canyon 2008-2012: Transmission; (RH rear engine compartment)
- Chevrolet & GMC Full-Size Trucks/SUVs (2007-2013): Silverado, Sierra, Tahoe, Yukon, Suburban, Avalanche; (next to battery)
- Chevrolet & GMC Full-Size Vans (2006-2014): Express, Savana; (RH engine compartment)
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please verify your part number or contact us with your VIN to ensure compatibility.
Frequently Asked Questions
Do I need to take my vehicle to the dealership for programming?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you the time and expense of a dealer visit.
What is the warranty on this part?
This Transmission Control Module is backed by a one-year warranty, giving you peace of mind and confidence in your repair.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of returning it.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal failure or solenoid driver faults), you should ensure other issues like wiring or solenoids have been checked. In my experience, a faulty TCM is the cause in over 80% of these cases on GM vehicles.
How do I provide my VIN for programming?
You can enter your vehicle’s 17-digit VIN during the checkout process. This ensures we program the module with the correct software for your specific vehicle configuration.