Restore Peak Transmission Performance to Your 2006 Trailblazer EXT
Is your 2006 Chevrolet Trailblazer EXT suffering from erratic shifting, getting stuck in gear, or displaying a check engine light with transmission-related codes? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and monitoring system health. When it fails, it can lead to frustrating drivability issues, poor fuel economy, and even potential damage to your transmission’s mechanical components.
This genuine GM T42 Transmission Control Module, part number 24256960, is the definitive solution. It arrives expertly pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN), ensuring a seamless, plug-and-play installation without the need for an expensive trip to the dealership for programming. Restore the precise, reliable performance you expect from your GM vehicle.
From the Diagnostic Bay
We had a 2006 Trailblazer EXT come into the shop with the classic P0700 (Transmission Control System Malfunction) code and a complaint of harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The owner had already spent a small fortune replacing shift solenoids based on a guess, but the problem persisted. We hooked up our professional scan tool and saw erratic data coming from the TCM. Instead of throwing more parts at it, we identified the root cause: the original module was failing internally. We installed one of our VIN-programmed T42 TCMs. After a quick battery disconnect to reset adaptations and clearing the codes, the truck shifted like it just rolled off the assembly line. It’s a perfect example of how correctly diagnosing the electronic controller saves time, money, and a lot of headaches.
Common Symptoms of a Failing 2006 Trailblazer EXT TCM
A faulty TCM can manifest in various ways. If you’re experiencing any of the following issues, your module is the likely culprit. Replacing your failing unit with our pre-programmed module is the most effective way to solve these problems for good.
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle entering ‘limp mode,’ often stuck in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-specific codes are stored.
- ✔ Inability to upshift or downshift properly.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The torque converter fails to lock or unlock correctly, causing RPM fluctuations at highway speeds.
- ✔ Complete loss of communication with the TCM, leading to a no-start or no-shift condition.
Key Features and Installation
This module is engineered to meet or exceed original equipment specifications, providing a reliable and lasting repair. We take the guesswork out of the process by handling the most critical step for you.
- ✔ Plug-and-Play Installation: Your module arrives pre-programmed with the latest GM software updates for your specific VIN. This eliminates the need for any additional programming or dealer intervention.
- ✔ Restored Performance: Resolves common DTCs and shifting issues, restoring smooth operation and optimal fuel economy.
- ✔ OEM-Standard Quality: Built to rigorous standards for durability and longevity, ensuring it can handle the demands of daily driving. Comes with a one-year warranty for your peace of mind.
- ✔ Simple Installation: For the 2006 Trailblazer EXT with an 8-cylinder engine, the TCM is typically located in the LH (driver’s side) engine compartment. The process usually 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.
- ✔ No Core Charge: Keep your old part. There’s no need to worry about returning a core, simplifying your repair process.
Guaranteed Fitment
While this part is a direct fit for the 2006 Trailblazer EXT, it is also compatible with a wide range of other GM vehicles utilizing the T42 controller and 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with service numbers including 24242391, 24234503, 24252114, and more. Trust in a part that is designed for your GM truck, van, or SUV.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before it ships. This makes the installation plug-and-play, saving you the time and expense of a dealership visit.
Where is the TCM located on my 2006 Trailblazer EXT?
On the 2006 Trailblazer EXT with the 8-cylinder engine, the Transmission Control Module is located in the engine compartment on the driver’s side (LH side).
Will this fix my P0700 and solenoid codes?
Yes, in most cases. A P0700 code simply means the TCM has detected a fault and has requested the check engine light. Faulty TCMs often trigger false solenoid codes. Replacing a bad module with this programmed unit will typically resolve these related electronic codes.
Is any special tool required for installation?
Basic hand tools are all that’s needed to unbolt the old module and install the new one. After installation, it’s recommended to use a standard OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
What is the warranty on this part?
This Transmission Control Module comes with a comprehensive one-year warranty, giving you confidence in your purchase.