Restore Peak Transmission Performance in Your Hummer H3
Is your 2008-2010 Hummer H3 suffering from erratic shifting, getting stuck in gear, or displaying transmission-related warning lights? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and monitoring system health. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage if left unaddressed. This replacement T42 TCM, part number 24235340, is the definitive solution to restore the smooth, reliable operation your vehicle was designed to deliver.
From the Diagnostic Bay
We had a 2009 Hummer H3 come into the shop with the check engine light on and the transmission stuck in what the owner called ’emergency mode’—it wouldn’t shift out of 3rd gear. The initial codes pointed towards a bad shift solenoid (P0750 series). After replacing the indicated solenoid, the problem persisted. A deeper dive with the scan tool showed intermittent communication loss with the TCM. Instead of throwing more parts at the transmission itself, we inspected the TCM. After installing one of our pre-programmed modules, all codes cleared, and the H3 shifted perfectly on the test drive. It’s a common scenario: the symptoms point to an internal transmission fault, but the root cause is often the electronic controller. This highlights the importance of correctly diagnosing the TCM before undertaking a costly internal transmission repair.
Symptoms of a Failing Hummer H3 TCM
- ✔ Harsh, delayed, or unpredictable gear shifts that make driving uncomfortable and unsafe.
- ✔ The vehicle enters “limp mode,” often getting stuck in a single gear (like 2nd or 3rd) to prevent further damage.
- ✔ Illumination of the Check Engine Light or other transmission warning indicators on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes are stored in the system.
- ✔ A noticeable drop in fuel efficiency as the transmission fails to operate in the optimal gear.
- ✔ Complete failure to shift, resulting in the vehicle being inoperable.
Why Choose Our Pre-Programmed 2008-2010 Hummer H3 TCM?
This isn’t just a replacement part; it’s a complete, plug-and-play solution. The biggest hurdle in replacing a modern TCM is the need for expensive and time-consuming programming at a dealership. We eliminate that step entirely. By providing us with your vehicle’s VIN during checkout, we program the module with the latest GM software specific to your Hummer H3. This ensures that it communicates flawlessly with your vehicle’s other systems, like the Engine Control Module (ECM), right out of the box. This 2008-2010 Hummer H3 TCM is built to meet or exceed original equipment standards, providing a dependable and long-lasting repair.
Simple Installation Process
Designed for a straightforward installation, this module can be replaced with basic hand tools. On the Hummer H3, the TCM is typically located in the engine compartment on the right-hand rear side. Always disconnect the vehicle’s battery before starting the repair to ensure safety and help reset the vehicle’s electronic systems. After swapping the module, reconnect the battery. While our programming resolves most issues, it’s always best practice to use a capable scan tool to clear any lingering fault codes from the vehicle’s memory. With no core charge, you can complete the job without the hassle of returning your old part.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles equipped with the T42 controller and 4-speed automatic transmissions like the 4L60E and 4L65E. It is an exact match for part number 24235340 and interchanges with numerous other service numbers, including: 24252114, 24234503, 24230461, 24234274, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and more. Restore your vehicle’s functionality and driving confidence by ordering your pre-programmed 2008-2010 Hummer H3 TCM today.
Frequently Asked Questions
What does “VIN Programmed” mean for my Hummer H3?
VIN programming means we load the module with the specific software and calibration files from General Motors that match your vehicle’s exact build. This ensures the TCM works perfectly with your engine, transmission, and other systems without needing a trip to the dealer for additional setup.
Can I install this TCM myself?
Yes, this part is designed for a straightforward installation. For the 2008-2010 Hummer H3, the TCM is located in the engine bay. With basic hand tools and by following safety precautions like disconnecting the battery, most DIY mechanics can complete the replacement in under an hour.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM itself can cause this code, it often appears alongside more specific codes. Replacing a defective TCM is a very common fix for a P0700 and related transmission codes.
Is there a core charge for this part?
No, we do not require a core charge for this Transmission Control Module. You can keep your old part, which simplifies the process and saves you the time and expense of return shipping.
What is the warranty on this TCM?
This Transmission Control Module comes with a one-year warranty, giving you peace of mind and protection against any defects in materials or workmanship. We stand behind the quality of our programmed electronic components.