If your 2006-2009 Buick Allure is suffering from jarring shifts, getting stuck in gear, or throwing transmission codes, the problem often points directly to a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make driving frustrating and unpredictable. This T42 Transmission Control Module, corresponding to part number 24243901, is the definitive solution, arriving expertly programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Forget about expensive dealership visits and the hassle of post-installation programming. We handle the critical software calibration before it ships, ensuring that once installed, your Allure’s transmission will communicate flawlessly with the engine, restoring the smooth, responsive performance you expect. This module directly manages shift solenoid activation, torque converter clutch engagement, and line pressure, correcting the root cause of many common transmission issues.
Case Study: A Tricky Diagnosis
I had a 2008 Buick LaCrosse (which shares the same platform as the Allure) come into my bay with intermittent harsh 1-2 shifts and a P0752 code (Shift Solenoid ‘A’ Stuck On). The owner had already replaced the solenoid twice at another shop, but the problem kept returning. After checking the wiring harness for continuity, I suspected the driver circuit inside the TCM. We installed one of our VIN-programmed T42 modules, and the problem vanished instantly. It wasn’t the solenoid at all; the TCM was sending erratic signals. This is a classic failure I’ve seen hundreds of times on these GM platforms.
Is Your Buick Allure Showing These Telltale Signs?
- ✔ Harsh, banging, or delayed gear shifts.
- ✔ The vehicle is stuck in ‘limp mode,’ often in 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Failure to upshift or downshift correctly, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
A Straightforward Guide to Installation
For the Buick Allure, this is a repair most DIYers can complete in under an hour with basic hand tools. This specific 2006-2009 Allure Transmission Module is designed for easy access and replacement.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- 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 harness connectors. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the heavy lifting, it’s good practice to use a basic OBD2 scan tool to clear any lingering fault codes from the vehicle’s memory. Start the engine and enjoy restored shifting performance.
Verified Vehicle Compatibility
While this is the correct 2006-2009 Allure Transmission Module, it is also a direct-fit, VIN-programmed solution for a wide range of other GM vehicles. Please verify your model and location below:
- Buick Allure (2006-2009): Found at the lower air cleaner housing.
- Chevrolet Impala (2006-2011): Located under the lower air cleaner housing.
- Chevrolet Silverado / GMC Sierra 1500 (2007-2013): Typically located next to the battery.
- Chevrolet Tahoe / GMC Yukon (2007-2009): Found next to the battery.
- Pontiac G6 (2006-2010): Mounted on the LH strut tower.
- Saturn Vue (2007-2009): Located in the LH front engine compartment.
- …and many other models listed in the full fitment guide.
What does ‘VIN Programmed’ actually mean for me?
What does ‘VIN Programmed’ actually mean for me?
It means this module is a plug-and-play solution. We load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it works perfectly with your car’s engine and transmission right out of the box, eliminating the need for a costly trip to the dealership for programming.
Will this fix a P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the TCM itself is the source of the fault. Replacing a failing TCM with our pre-programmed unit is a very common and effective way to resolve a P0700 code and the specific codes that triggered it (like solenoid circuit faults).
Is this a difficult part to install myself?
For most individuals with basic mechanical skills, this is a very manageable job. The module is usually in an accessible location in the engine bay, requiring only simple hand tools to unbolt and unplug. Our step-by-step guide above outlines the general process.
Do I need to send my old part back?
No, there is no core charge or need to return your old module. You can dispose of or keep your original part, making the process faster and more convenient for you.
What kind of warranty is included?
We stand behind our products with a comprehensive one-year warranty, giving you peace of mind that you are installing a quality, reliable part in your vehicle.