Restore Your Buick’s Drivability and Performance
If your 2006-2009 Buick Allure is suffering from erratic shifting, getting stuck in gear, or throwing transmission-related check engine lights, a failing Transmission Control Module (TCM) is the most likely culprit. As a seasoned technician, I’ve seen countless GM vehicles with these exact issues, and the fix is often simpler than you think. This T42 Transmission Control Module, part number 24238856, is the definitive solution to restore the smooth, reliable performance your car was built for. It arrives expertly programmed to your vehicle’s specific VIN, making it a true plug-and-play repair that eliminates the need for a costly trip to the dealership.
A Technician’s Notebook
I recently had a 2008 Buick Allure in the bay with a classic case of TCM failure. The owner was frustrated with harsh, unpredictable 1-2 shifts and the car occasionally defaulting to ‘limp mode’ (stuck in 3rd gear). A quick scan revealed a P0700 (Transmission Control System Malfunction) code. Instead of spending hours chasing down potential solenoid issues, my experience pointed directly to the T42 module. We ordered this VIN-programmed unit, and the installation took less than 20 minutes. After clearing the codes, the car shifted perfectly. This part saved my customer hundreds in diagnostic time and dealership programming fees.
Is Your Buick Allure Showing These Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, slamming, or delayed 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, P0753, or other solenoid-specific codes are present.
- ✔ Poor fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the transmission module.
The Brains Behind Your Transmission: A Reliable Fix for your 2006-2009 Allure TCM
The TCM is the electronic brain of your automatic transmission. It processes data from various sensors to control shift solenoids, manage hydraulic pressure, and ensure the torque converter locks up at the right time. When it fails, the entire system’s harmony is disrupted. Our replacement 2006-2009 Allure TCM is built to strict OEM specifications to precisely manage these functions, ensuring long-term reliability and restoring the original driving feel of your vehicle. The critical benefit is our VIN programming service—we flash the module with the latest GM software for your exact vehicle before it ships, so it’s ready for immediate installation right out of the box.
A Straightforward Guide to Installation
For the DIY enthusiast or professional mechanic, replacing the TCM on a Buick Allure is a very manageable job that typically takes under 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On the 2006-2009 Buick Allure, the TCM is conveniently located inside the lower air cleaner housing. You will need to remove the air cleaner assembly to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount the new, pre-programmed TCM in place, re-secure the bolts, and firmly plug in the electrical connectors until they click.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery terminal. Start the vehicle and use a scan tool to clear any stored fault codes. No further programming is required.
Verified Vehicle Compatibility
This module is a direct-fit replacement for the 2006-2009 Buick Allure. It is also compatible with a wide range of other General Motors vehicles that use the T42 TCM, including models from Chevrolet, GMC, Pontiac, Saturn, and more. It interchanges with part numbers 24252114, 24234503, 24238856, and others listed in the product data.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean for my repair?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM-certified software onto the module before we ship it. This ensures it communicates perfectly with your car’s other computers (like the ECM) for optimal performance, eliminating the need for expensive dealer-only programming tools.
Do I need any special tools for this installation?
No special tools are required. Basic hand tools like a socket set and screwdriver to remove the air cleaner housing are all you should need. A standard OBD2 scan tool is helpful for reading and clearing codes, but not required for the physical installation.
Will this part fix a P0700 code on my Buick Allure?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal failure), it’s important to verify there aren’t external wiring or solenoid issues. However, in my experience, a faulty TCM is the most common reason for a P0700 code accompanied by shifting problems.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of sending it back, simplifying the repair process for you.