If your 2006 Chevrolet Trailblazer EXT is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). This isn’t just an inconvenience; it’s a critical failure that affects your vehicle’s performance, safety, and fuel economy. This T42 TCM, corresponding to part number 24235754, is the definitive solution to get your Trailblazer’s 4L60E or 4L65E transmission operating like new again.
The beauty of this module lies in our pre-programming service. We flash it to your specific Vehicle Identification Number (VIN) before it even leaves our facility. This means you can skip the expensive trip to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, immediately resolving communication errors and performance issues that plague a failing TCM. This is the same high-quality component I would confidently install in a customer’s vehicle in my own shop.
Case Study: A Tricky Diagnosis
A customer brought in a 2006 Trailblazer EXT with the 8-cylinder engine, complaining of harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). His scanner showed a P0753 code for Shift Solenoid ‘A’ Electrical. He had already replaced the solenoid twice with no luck. After a quick data stream check, I noticed the TCM was intermittently dropping communication. This is a classic sign. The internal circuitry of the original TCM was failing, sending faulty commands and false codes. We installed a VIN-programmed T42 module, cleared the codes, and the truck shifted perfectly. The problem wasn’t the solenoid; it was the brain telling it what to do. This part saved him from a potential transmission rebuild.
Is Your Trailblazer Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, a faulty module is the likely culprit:
- âś” Vehicle is stuck in “limp mode” and won’t shift out of a single gear.
- âś” Harsh, banging shifts or delayed gear engagement from a stop.
- âś” The check engine light is on with transmission-specific Diagnostic Trouble Codes (DTCs) like P0700, P0750-series solenoid codes, or U-series communication codes.
- âś” Inconsistent or no shifting, leading to poor acceleration and terrible fuel mileage.
- âś” Complete loss of communication with the transmission, making it unresponsive.
A Straightforward Guide to Your 2006 Trailblazer EXT TCM Installation
You don’t need to be a master mechanic to handle this job. For the 2006 Trailblazer EXT with the 8-cylinder engine, the TCM is conveniently located in the engine compartment. Follow these steps for a successful installation in about 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your Trailblazer, you’ll find the TCM in the left-hand (driver’s side) of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your 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 the module is pre-programmed, it’s always good practice to use a basic OBD2 scan tool to check for and clear any stored fault codes. Start the vehicle and enjoy smooth shifting!
Verified Vehicle Fitment
This T42 TCM is a direct replacement for part number 24235754 and other service numbers. It is guaranteed to fit the following configuration:
- 2006 Chevrolet TRAILBLAZER EXT (with 8 cylinder engine, located in LH engine compartment)
This module also fits a wide range of other GM vehicles from 2006-2014, including the Silverado, Tahoe, Yukon, Sierra, Impala, and more. Please verify your part number or contact us with your VIN to ensure perfect compatibility.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We program the module to your vehicle’s VIN before shipping. It is a plug-and-play solution, saving you time and money.
What tools are required for installation?
Only basic hand tools are needed, typically a socket set to remove the mounting bolts. No special diagnostic equipment is required for installation.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or recycle it at your convenience without the hassle of sending it back.
Will this fix a P0700 trouble code?
A P0700 is a generic code indicating the TCM has detected a fault. This module often resolves the underlying issue causing the P0700, such as internal circuit failure or solenoid driver faults.
What is the warranty on this part?
This transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your repair.