Restore Flawless Shifting to Your Buick Allure
Is your 2006-2009 Buick Allure suffering from erratic shifting, getting stuck in gear, or throwing transmission-related check engine light 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 every gear change, managing torque converter lockup, and ensuring smooth, efficient operation. When it fails, it can mimic serious internal transmission problems, leading to a frustrating and potentially unsafe driving experience. This OEM-quality T42 TCM, part number 24243901, is the definitive solution to restore your vehicle’s factory performance and reliability.
We recently had a 2008 Buick LaCrosse (which shares the same platform as the Allure) come into the shop. The owner was convinced he needed a full transmission rebuild, quoted at over $3,000 by another shop. The car was shifting harshly from 1st to 2nd and would occasionally go into ‘limp mode.’ After a quick scan, we saw a P0752 code (Shift Solenoid A Stuck On). While this can be a solenoid issue, we checked the TCM’s command signals and found they were erratic. Instead of a costly rebuild, we installed a VIN-programmed T42 module. The car shifted perfectly on the test drive, and all codes were cleared. The customer saved thousands by correctly diagnosing the electronic failure first.
The Importance of a Programmed 2006-2009 Allure Transmission Module
Modern vehicles rely on precise communication between various electronic modules. This replacement TCM is not a generic, one-size-fits-all part. It comes expertly pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module has the correct software and calibrations for your Allure’s engine, transmission (like the 4L60E or 4L65E), and tire size. This eliminates the need for an expensive trip to the dealership for programming, making the installation a true plug-and-play process. You can install it in your driveway and be back on the road with confidence, knowing your transmission is operating exactly as the manufacturer intended.
Common Symptoms of a Failing Buick Allure TCM
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The vehicle feels stuck in one gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ Failure to upshift or downshift correctly.
- ✔ A noticeable decrease in fuel economy.
- ✔ Intermittent loss of communication with the scan tool.
Simple Installation and Guaranteed Compatibility
Replacing the 2006-2009 Allure Transmission Module is a straightforward job for a DIY mechanic. On the Buick Allure, this module is typically located under the air cleaner housing. The process involves disconnecting the battery, removing the air cleaner assembly for access, unplugging the electrical connectors from the old module, unbolting it, and installing the new one in its place. Once the new module is connected and the battery is reconnected, the vehicle is ready to go. This part is a direct replacement and is interchangeable with a wide range of GM service numbers, including 24252114, 24234503, 24243901, and more, ensuring a perfect fit for your vehicle. With our one-year warranty and no core charge, you can make this essential repair with complete peace of mind.
Frequently Asked Questions
What does this T42 Transmission Control Module do?
The T42 TCM acts as the central computer for your automatic transmission. It receives data from various sensors (like vehicle speed and engine RPM) and uses it to control shift solenoids, regulate hydraulic pressure, and manage the torque converter clutch, ensuring smooth and efficient gear changes.
Is this part difficult to install on my Buick Allure?
Installation is generally straightforward and can be completed in under an hour with basic hand tools. On the 2006-2009 Allure, the TCM is located under the lower air cleaner housing. Simply disconnect the battery, access the module, swap the electrical connectors and mounting bolts, and you’re done. Since it’s pre-programmed, no further steps are needed.
Why is VIN programming so important?
VIN programming loads your vehicle’s specific factory software and calibrations onto the module. This ensures it communicates correctly with the Engine Control Module (ECM) and other vehicle systems, resulting in optimal shift patterns, fuel economy, and overall performance. A non-programmed module will not function correctly.
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 this module can resolve the underlying issue that caused the P0700 (like a faulty solenoid driver), it’s crucial to have the specific transmission codes read to confirm the diagnosis. This module often resolves codes related to shift solenoids and communication errors.
Do I need to return my old part?
No, there is no core charge for this part. You can keep your old module without any extra fees or hassle, simplifying the repair process for you.