Is your 2008, 2009, or 2010 HUMMER H3 suffering from transmission problems like harsh shifting, getting stuck in gear, or an illuminated check engine light? These are common indicators of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your H3’s automatic transmission, responsible for managing shift points, fluid pressure, and overall performance. When it fails, it can cripple your vehicle’s drivability and reliability. This OEM-quality T42 TCM, part number 24234503, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a seamless, plug-and-play installation.
From the Diagnostic Bay
We once had a 2009 GMC Canyon (which shares its platform and T42 TCM with the H3) come into the shop with a persistent P0752 code for Shift Solenoid ‘A’ Stuck On. The owner had already spent money replacing the solenoid pack inside the transmission, but the erratic shifting and check engine light returned within a day. After confirming the wiring harness was intact, we pinpointed the issue to the TCM itself. The internal driver circuit for that specific solenoid was failing intermittently. Installing a VIN-programmed T42 module not only solved the problem instantly but also saved the customer from a costly and unnecessary transmission rebuild. This highlights how crucial it is to correctly diagnose the electronic controller before condemning internal mechanical parts.
Symptoms of a Failing HUMMER H3 TCM
A faulty transmission control module can manifest in various ways, often being mistaken for an internal transmission failure. Before considering expensive mechanical repairs, check if your H3 is exhibiting any of these classic TCM failure symptoms:
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable and unpredictable.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear to prevent further damage.
- ✔ Your dashboard displays a Check Engine Light or a specific transmission warning indicator.
- ✔ Diagnostic scans reveal transmission-related Diagnostic Trouble Codes (DTCs), such as P0700, P0750, P0755, or other solenoid-specific codes.
- ✔ A noticeable decrease in fuel economy as the transmission fails to operate in the optimal gear.
- ✔ Complete failure to shift, either up or down, or a refusal to engage a gear from Park.
The Importance of a Pre-Programmed 2008-2010 HUMMER H3 TCM
Replacing a modern electronic module isn’t just a matter of swapping parts. The TCM must be programmed with the correct software and calibration files that match your vehicle’s specific VIN. This ensures all systems communicate correctly for optimal performance and fuel efficiency. Our service eliminates the need for an expensive trip to the dealership for programming. We flash the module with the latest GM-certified software using your VIN before it ships. This makes the installation process straightforward: simply remove the old module and install the new one. It’s a direct-fit solution designed to restore your vehicle’s original performance without any additional steps or specialized tools.
This module is a direct replacement for a wide range of service numbers, including 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, and many others, ensuring broad compatibility across the GM family of vehicles that use the T42 controller with 4-speed automatic transmissions like the 4L60E and 4L65E.
Frequently Asked Questions
What does a VIN-programmed TCM mean for my HUMMER H3?
VIN programming means we load the module with the specific software and calibration files from GM that match your vehicle’s unique Vehicle Identification Number. This ensures perfect compatibility with your engine, transmission, and other electronic systems, making the part truly plug-and-play without needing a dealer visit.
Is this a difficult part to install?
No, the installation is very straightforward for someone with basic mechanical skills. On the 2008-2010 HUMMER H3, the TCM is located in the right-hand rear of the engine compartment. The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. The entire job typically takes less than 30 minutes.
Will this module fix transmission error codes like P0700?
Yes. A P0700 code is a general fault code indicating the TCM has detected a problem. If the root cause of the code is a faulty TCM, replacing it with our pre-programmed unit will resolve the issue. It also commonly fixes more specific solenoid circuit codes (e.g., P0750-P0758) that are caused by failing drivers within the module itself.
Do I need to send my old part back? Is there a core charge?
No, there is no core charge for this part. You can keep your old module, which saves you the time, hassle, and expense of packaging and shipping a core back to us.
Is this compatible with other GM vehicles?
Absolutely. While this listing is focused on the HUMMER H3, this T42 TCM is compatible with a vast range of 2006-2014 GM vehicles, including the Chevrolet Silverado, Tahoe, Impala; GMC Sierra, Yukon; Cadillac DTS, and many others equipped with 4-speed automatic transmissions. Please verify your part number to ensure an exact match.