Restore Peak Transmission Performance in Your GM Vehicle
Is your 2006-2009 Chevrolet Trailblazer, or another compatible GM vehicle, suffering from poor shifting, getting stuck in gear, or showing transmission-related error codes? A failing Transmission Control Module (TCM) is often the culprit behind these frustrating and potentially damaging issues. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating shift points, managing torque converter lockup, and ensuring smooth, efficient operation. When it fails, your driving experience and vehicle reliability are compromised. This OEM-quality T42 TCM, part number 24240449, is the definitive solution, arriving pre-programmed to your vehicle’s VIN for a seamless, plug-and-play installation.
Expert Pro Tip
Before installing your new TCM, always disconnect the vehicle’s battery for at least 15 minutes. This helps reset the vehicle’s internal computer systems and ensures it properly recognizes the new module upon startup. After installation, use a quality OBD2 scan tool to clear any stored diagnostic trouble codes (DTCs) for a clean slate.
Is Your Transmission Control Module Failing?
A faulty TCM can manifest in various ways, often mimicking mechanical transmission problems. If you’re experiencing any of the following, it’s time to inspect your TCM:
- ✔ Erratic and Harsh Shifting: Abrupt, jerky gear changes or a noticeable delay when shifting between drive and reverse.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (typically 2nd or 3rd) to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes like P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (e.g., P0750, P0753) are present.
- ✔ Poor Fuel Economy: Inefficient shifting leads to the engine operating outside its optimal RPM range, increasing fuel consumption.
- ✔ No Communication: A scan tool is unable to communicate with the transmission module, indicating a complete electronic failure.
The Definitive Solution: A VIN-Programmed Trailblazer Transmission Control Module
Replacing a faulty module shouldn’t be a complicated ordeal. Our T42 Trailblazer Transmission Control Module is engineered to eliminate the common headaches associated with this repair. By providing your vehicle’s VIN at checkout, we program the module with the latest GM software specific to your vehicle. This critical step ensures that all shift strategies and operational parameters are perfectly matched, restoring the smooth, reliable performance you expect. This process bypasses the need for an expensive trip to the dealership for programming, saving you time and money.
This module is a direct replacement for a wide array of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is compatible with numerous models, including the Chevrolet Silverado, Tahoe, Impala; GMC Sierra, Yukon; Buick LaCrosse; Cadillac DTS; and many more, making it a versatile and reliable choice for your repair needs.
Frequently Asked Questions
What does a Transmission Control Module (TCM) do?
The TCM is a computer that collects data from various sensors on the engine and transmission to control all aspects of shifting. It determines the best time to shift gears for performance and fuel efficiency, controls line pressure, and manages the torque converter clutch.
Why is VIN programming so important for this part?
VIN programming loads your vehicle’s specific software and calibrations onto the module. Without it, the TCM won’t know the correct shift points, tire size, or gear ratios, leading to poor performance, warning lights, and potential transmission damage. Our pre-programming makes installation a simple plug-and-play process.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault code indicating that the TCM has detected a problem and has requested the Check Engine Light to be turned on. While a faulty TCM itself can cause this code, it’s often accompanied by other, more specific codes. Replacing a failed TCM is a common fix for a P0700 code, especially when other symptoms are present.
How difficult is the installation?
For most DIYers with basic tools, the installation is straightforward and typically takes less than an hour. The TCM is usually located in the engine bay (e.g., next to the battery, on the strut tower, or under the air cleaner box). Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep your old module, which saves you the hassle and expense of return shipping.