If your 2006-2009 Buick Allure is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. As an automotive technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise reliable vehicle. This T42 TCM, part number 24241806, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
The TCM is the brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter clutch lockup, and monitoring sensor data. When it fails, communication breaks down, leading to the frustrating and potentially damaging symptoms you’re experiencing. Our service eliminates the biggest headache of this repair: the need for expensive dealership programming. We handle the programming for you, ensuring that once installed, your vehicle’s computer system recognizes the new module immediately, restoring smooth, predictable performance.
A Technician’s Notebook: The Case of the Limping LaCrosse
A customer brought in a 2008 Buick LaCrosse—a sister car to the Allure—stuck in ‘limp mode,’ meaning it wouldn’t shift out of 3rd gear. The dash was lit up with a Check Engine light and a transmission warning. A quick scan pulled code P0700 (Transmission Control System Malfunction) and several solenoid-specific codes. In my experience, when you see a cluster of transmission codes like that, the issue often points back to the module itself rather than multiple simultaneous solenoid failures. We confirmed the wiring was intact, pointing directly to an internal TCM failure. Instead of a costly trip to the dealer, we installed one of our VIN-programmed T42 modules. The entire job took less than an hour, the codes were cleared, and the car was shifting perfectly on the test drive. The customer saved hundreds and was back on the road the same day.
Is Your Buick Allure Showing These Transmission Issues?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s time to consider a replacement 2006-2009 Allure TCM.
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Inability to upshift or downshift properly.
- ✔ Poor fuel economy and a feeling of lost power.
- ✔ Intermittent loss of communication with the transmission module.
A Straightforward Guide to Your Allure TCM Installation
This repair is well within the reach of a DIY enthusiast. For the 2006-2009 Buick Allure, the TCM is conveniently located, making for a quick swap.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the Module: On your Buick Allure, the TCM is typically found attached to the lower air cleaner housing in the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed TCM into place. Securely plug in the electrical connectors until they click.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Start the vehicle and take it for a test drive to confirm smooth operation.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit, VIN-programmed solution for a wide range of General Motors vehicles. While this page focuses on the 2006-2009 Allure TCM, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
- Allure (2006-2009): Transmission; (lower air cleaner housing)
- LaCrosse (2006-2009): Transmission; (lower air cleaner housing)
- Impala (2006-2011): Transmission; (lower air cleaner housing)
- Monte Carlo (2006-2007): Transmission; (lower air cleaner housing)
- Grand Prix (2006-2008): Transmission; (lower air cleaner housing)
- Cobalt / G5 / Pursuit (2006-2010): Transmission; (LH strut tower)
- HHR (2006-2011): Transmission; (LH engine compartment)
- Malibu (2006-2010): Transmission; (LH frame rail)
- Silverado / Sierra 1500 (2007-2013): Transmission; (next to battery)
- Tahoe / Yukon (2007-2009): Transmission; (next to battery)
- And many more GM, Saturn, Pontiac, and Saab models. See full fitment list for details.
Frequently Asked Questions
Do I need to take my car to the dealer for programming?
No. This is the biggest benefit of our service. We program the module to your vehicle’s VIN before shipping it. This makes the installation plug-and-play, saving you the time and expense of a dealership visit.
Is this part difficult to install myself?
For most models, including the Buick Allure, this is a very straightforward installation that can be completed in under 30 minutes with basic hand tools. The module is typically easy to access in the engine bay.
What is the warranty on this TCM?
This module comes with a one-year warranty, giving you peace of mind and confidence in your repair. We stand behind the quality and reliability of our programmed electronics.
Is there a core charge for my old part?
No, there is no core charge required. You can keep your old part or dispose of it at your convenience without the hassle of returning it.