Restore Peak Transmission Performance to Your 2006 Trailblazer EXT
Is your 2006 Chevrolet Trailblazer EXT experiencing unpredictable and frustrating transmission issues? If you’re dealing with harsh, erratic shifting, getting stuck in limp mode, or seeing persistent check engine lights, a failing Transmission Control Module (TCM) is the most likely culprit. This vital component is the brain of your automatic transmission, and when it fails, it can disrupt your entire driving experience. Replace it with our expertly VIN-programmed GM T42 TCM, part number 24238856, for a permanent, plug-and-play solution.
This module is engineered to OEM specifications, ensuring it communicates flawlessly with your vehicle’s powertrain. It precisely manages shift solenoids, torque converter lockup, and line pressure, restoring the smooth, responsive shifting you expect from your GM vehicle. By providing us with your VIN during checkout, we program the module with the latest factory software specific to your Trailblazer EXT, eliminating the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We recently had a 2006 Trailblazer EXT come into the shop with the classic ‘stuck in 3rd gear’ complaint. The owner was frustrated, and the scan tool was showing a generic P0700 transmission fault code along with several solenoid circuit errors. A less experienced technician might start replacing solenoids inside the transmission pan, a costly and time-consuming job. However, we know that on these GM platforms, multiple solenoid codes often point to a single electronic failure point: the TCM itself. We installed one of our pre-programmed T42 modules, cleared the codes, and the vehicle shifted perfectly on the test drive. It’s a textbook repair that saved the customer hundreds in unnecessary labor and parts.
Symptoms of a Failing 2006 Trailblazer EXT TCM
- ✔️ Harsh or slamming gear changes, both upshifting and downshifting.
- ✔️ The vehicle gets stuck in a single gear (limp mode) to protect the transmission.
- ✔️ An illuminated Check Engine Light or Transmission Warning Light on your dash.
- ✔️ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔️ Delayed engagement when shifting from Park into Drive or Reverse.
- ✔️ Poor fuel economy and a feeling of sluggish performance.
- ✔️ Complete loss of communication with the transmission, preventing it from shifting at all.
The Plug-and-Play Advantage: VIN Programming
The single biggest benefit of our T42 TCM is the pre-installation VIN programming. Modern vehicles require modules to be coded specifically to the car they are installed in. Skipping this step will result in a no-start condition or continued transmission faults. Our service handles this for you. Your new 2006 Trailblazer EXT TCM will arrive at your door ready for immediate installation, loaded with the correct GM software for optimal performance and longevity.
Simple Installation for DIY Repair
This module is typically located in the engine compartment on the LH side, making it accessible for a straightforward replacement. The process generally takes less than 30 minutes. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. We recommend using a basic scan tool to clear any stored DTCs after installation is complete. Best of all, there is no core charge, so you don’t have to worry about the hassle and expense of sending your old part back.
This module is a direct replacement for a wide range of GM part numbers, including: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24239224, 24239926, 24240400, 24241806, 24243901, 24256960, and many more. It’s the definitive solution for your transmission woes.
Frequently Asked Questions
What is VIN programming and why is it required?
VIN programming is the process of loading your vehicle’s unique 17-digit Vehicle Identification Number and corresponding factory software onto the module. This ensures the TCM can communicate correctly with the Engine Control Module (ECM) and other systems in your Trailblazer EXT. Without it, the vehicle will not function properly.
Can I install this TCM myself?
Yes, this is a common DIY repair. The module is located in an accessible spot in the engine bay. Basic hand tools are all that’s required. The key is to disconnect the battery before you begin and to ensure the electrical connectors are seated firmly upon reinstallation.
Will this fix my P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause of a P0700 and related solenoid codes, you should always confirm the diagnosis. If the module itself is the source of the electrical fault, this replacement part is the correct fix.
Is there a warranty included with this part?
Absolutely. This transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your repair. We stand behind the quality and reliability of our electronic components.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep your old module, dispose of it, or save it without any obligation or extra fees.