Restore Peak 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 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 cripple your vehicle’s drivability and leave you stranded. This OEM-quality T42 TCM, part number 24243901, is the definitive solution to restore your transmission’s precise, factory-like operation.
From the Diagnostic Bay
We recently had a 2006 Trailblazer EXT towed in that was stuck in ‘limp mode’—it wouldn’t shift out of 3rd gear. The owner was worried about a catastrophic transmission failure and a multi-thousand dollar repair bill. After a quick scan, we pulled a P0700 code, pointing to a general transmission fault. Further digging revealed intermittent communication with the TCM. Instead of a full transmission rebuild, we installed one of our VIN-programmed T42 modules. In under an hour, the vehicle was shifting perfectly, all codes were cleared, and the customer drove away with a reliable vehicle, saving a fortune in unnecessary repairs.
Symptoms of a Failing 2006 Trailblazer Transmission Module
A faulty TCM can manifest in various ways, often getting worse over time. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, delayed, or unpredictable gear shifts that make driving uncomfortable.
- ✔ The vehicle feels stuck in one gear (limp mode) and won’t upshift or downshift.
- ✔ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the transmission, preventing it from engaging.
The Plug-and-Play Advantage: VIN Programming Included
Don’t settle for a generic module that requires a trip to the dealership for expensive programming. We take care of the critical step for you. Before shipping, we program this module with your Trailblazer’s specific Vehicle Identification Number (VIN) and load the latest GM software updates. This ensures it communicates flawlessly with your vehicle’s other systems, like the Engine Control Module (ECM), right out of the box. This direct-fit, pre-programmed approach eliminates compatibility errors and allows for a straightforward installation, getting you back on the road faster.
Simple Installation for DIYers and Professionals
Replacing the TCM on your 2006 Trailblazer EXT is a manageable job. The module is typically located in the LH (driver’s side) engine compartment. The process is as simple as disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and installing the new one in its place. Once installed, reconnect the battery. While the module is plug-and-play, we recommend using a basic OBD2 scan tool to clear any stored diagnostic codes to complete the reset process. With no core charge, you can keep your old part without the hassle of returning it.
Frequently Asked Questions
What is VIN programming and why is it essential?
VIN programming loads your vehicle’s specific software and calibration files onto the module. This ensures the TCM works perfectly with your Trailblazer’s engine, transmission type, and other electronic systems. Without it, the module won’t function correctly, leading to persistent shifting problems.
Do I need to visit a dealership after installing this part?
No. Because this module is pre-programmed to your VIN, no further dealership programming or initialization is required. It is designed for a direct, plug-and-play installation.
Where is the TCM located on a 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 module fix specific error codes like P0700 or P0750?
Yes. If the error codes are being caused by a faulty TCM, this replacement module is the correct fix. Codes like P0700 (Transmission Control System Malfunction) and P0750 (Shift Solenoid ‘A’ Malfunction) are common indicators of internal TCM failure.
Is this compatible with other GM vehicles?
Absolutely. This T42 TCM is compatible with a wide array of 2006-2014 GM vehicles using 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E, including models like the Silverado, Tahoe, Yukon, Impala, and more. It interchanges with numerous part numbers, including 24252114, 24234503, and 24243921.