Restore Peak Transmission Performance in Your GM Vehicle
Is your Buick Allure, Chevrolet Silverado, or GMC Sierra suffering from erratic shifting, delayed gear engagement, or getting stuck in limp mode? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, it can cause a cascade of frustrating and potentially damaging issues. This replacement T42 Transmission Control Module, service part number 24235754, is the definitive solution to restore your vehicle’s drivability and reliability.
The Critical Role of a Programmed 2006-2009 Allure Transmission Module
Your vehicle’s transmission doesn’t just shift gears on its own; it relies on constant communication between the engine computer (ECU) and the TCM. The TCM analyzes data from various sensors—like vehicle speed, throttle position, and engine load—to determine the optimal moment to shift gears, engage the torque converter clutch, and adjust line pressure. A faulty module disrupts this communication, leading to the harsh shifts, poor fuel economy, and diagnostic trouble codes (DTCs) you may be experiencing. Our T42 TCM comes pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN), ensuring it has the latest GM software and communicates flawlessly with your vehicle’s systems right out of the box. This eliminates the need for expensive dealership programming and ensures optimal performance from the moment of installation.
From the Diagnostic Bay
We had a 2008 Chevy Tahoe come into the shop with a classic complaint: intermittent harsh 1-2 shifts and a P0700 code that wouldn’t stay cleared. The owner had already replaced two shift solenoids based on a generic code reading, but the problem persisted. After a quick scan, we saw erratic data from the TCM. Instead of throwing more parts at it, we installed one of our VIN-programmed T42 modules. The installation took less than 20 minutes. After clearing the codes, we took it for a test drive. The shifts were buttery smooth, and the codes never returned. It’s a perfect example of how correctly diagnosing the ‘brain’ saves time and money over chasing individual component symptoms.
Symptoms of a Failing T42 TCM
- ✔ Erratic Shifting: Experiencing harsh, jerky, or delayed gear changes that make driving uncomfortable.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔ Limp Mode: Your vehicle is stuck in a single gear (often 2nd or 3rd) to prevent further damage, severely limiting speed.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup can cause a noticeable drop in MPG.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes associated with TCM failure include P0700, P0750, P0753, P0758, and other solenoid-related faults.
- ✔ Complete Failure to Shift: The transmission may refuse to shift up or down, or fail to engage Drive or Reverse.
Plug-and-Play Installation
This module is engineered for a straightforward installation process. On most compatible models, such as the Buick LaCrosse, Cadillac DTS, or GMC Savana, the TCM is located in the engine compartment and is easily accessible. Depending on your specific vehicle, you might find it on the LH strut tower, next to the battery, or under the air cleaner box. The entire replacement can typically be completed in under 30 minutes with basic hand tools. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Once the new module is connected and the battery is reconnected, you’re ready to go. We recommend using a basic scan tool to clear any stored DTCs after installation for a clean slate.
This module is a direct replacement for a wide range of GM part numbers, including 24252114, 24234503, 24230461, 24235754, and many others, making it a versatile solution for numerous trucks, vans, and sedans. By choosing our VIN-programmed 2006-2009 Allure Transmission Module, you are not just buying a part; you are getting a complete, hassle-free solution that restores your vehicle’s intended performance and reliability.
Frequently Asked Questions
What does this T42 Transmission Control Module do?
The T42 TCM acts as the central computer for your automatic transmission. It controls shift timing, solenoid operation, torque converter clutch lockup, and line pressure to ensure smooth, efficient, and reliable operation of transmissions like the 4L60E, 4L65E, and 4L70E.
Why is VIN programming so important for a TCM?
VIN programming loads your vehicle’s specific software and calibrations onto the module. This ensures it communicates correctly with the Engine Control Unit (ECU) and other vehicle systems, accounting for your specific engine, axle ratio, and tire size. Without it, the transmission may not shift correctly, or the vehicle may not start at all.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem and has requested the Check Engine Light to be turned on. While this module often resolves the root cause of a P0700, it’s essential to scan for other transmission-specific codes (like P07xx) to confirm the TCM is the issue. This part is designed to resolve common internal TCM failures that trigger these codes.
Is this part difficult to install myself?
For most individuals with basic mechanical skills, installation is straightforward. The module is typically located in an accessible part of the engine bay. The process involves disconnecting the battery, unplugging a few connectors, and removing a few bolts. Since our modules are pre-programmed, no special tools are required for software flashing.
Do I have to return my old TCM?
No, there is no core charge for this part. You can keep your old module, which saves you the time and hassle of packaging and shipping it back.