Is your 2006-2009 Buick Allure suffering from frustrating and unpredictable transmission behavior? If you’re dealing with harsh shifts, a car that won’t shift out of gear, or a persistent check engine light, you’re not alone. In my 20+ years of diagnosing these exact issues, the Transmission Control Module (TCM) is often the culprit. This isn’t just an inconvenience; it’s a critical failure that can leave you stranded. This T42 TCM, part number 24235753, is the definitive, reliable solution to restore your vehicle’s performance and your peace of mind.
This isn’t just a replacement part; it’s a complete, ready-to-install fix. We pre-program each module to your vehicle’s specific VIN, ensuring it communicates perfectly with your car’s powertrain system right out of the box. This bypasses the costly and time-consuming trip to a dealership for programming. As the ‘brain’ of your automatic transmission, this module precisely controls shift points, line pressure, and torque converter clutch engagement, bringing back the smooth, responsive driving experience you expect from your Buick.
Is Your Buick Allure Showing These Telltale Signs?
- ✔️ Harsh, slamming, or erratic gear shifts.
- ✔️ The vehicle is stuck in a single gear, often called “limp mode” (usually 2nd or 3rd).
- ✔️ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔️ An illuminated Check Engine Light or Transmission Warning Light with codes like P0700 (Transmission Control System Malfunction) or various solenoid codes (e.g., P0750-P0758).
- ✔️ A sudden drop in fuel economy or a feeling of slipping gears.
- ✔️ Complete failure to shift up or down.
From the Diagnostic Bay: The “Simple” Fix
I remember a customer bringing in a 2008 Buick Allure, convinced the transmission was completely shot and bracing for a multi-thousand-dollar repair bill. The car was banging into gear and wouldn’t shift past 2nd. After a quick scan, we found a classic TCM communication fault. Instead of a full transmission rebuild, the fix was this exact module. In under an hour, we had the new, programmed TCM installed. The customer was back on the road for a fraction of the cost, with their car shifting like it just left the factory. It’s a powerful reminder that correct diagnosis saves thousands.
A Straightforward Guide to Installation
One of the best features of this module is its simple, DIY-friendly installation. For the 2006-2009 Allure, you can get this done in your own driveway with basic hand tools in under 30 minutes. No core charge means you don’t have to worry about sending the old part back.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On the Buick Allure, the TCM is typically found inside or attached to the lower air cleaner housing in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note their orientation. Then, unbolt the module from its mounting bracket.
- Install the New Module: Mount the new VIN-programmed TCM in place of the old one. Securely reconnect the electrical harnesses.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the previous failure. Start the car and enjoy smooth shifting!
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this page focuses on the 2006-2009 Allure Transmission Module, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
- Buick Allure (2006-2009): Transmission; (lower air cleaner housing)
- Buick LaCrosse (2006-2009): Transmission; (lower air cleaner housing)
- Chevrolet Cobalt (2006-2010): Transmission; (LH strut tower)
- Chevrolet HHR (2006-2011): Transmission; (LH engine compartment)
- Chevrolet Impala (2006-2011): Transmission; (lower air cleaner housing)
- Chevrolet Monte Carlo (2006-2007): Transmission; (lower air cleaner housing)
- Pontiac G6 (2006-2010): Transmission; (LH strut tower)
- And many more GM trucks, vans, and SUVs from 2006-2014. This module interchanges with part numbers 24252114, 24234503, 24230461, 24235753, and others.
What does ‘VIN Programmed’ actually mean for me?
What does ‘VIN Programmed’ actually mean for me?
It means we load your car’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it works perfectly with your engine and other vehicle systems without requiring any additional, expensive programming from a mechanic or dealer. It’s truly a plug-and-play solution.
Is this a difficult part to install myself?
Not at all. For a Buick Allure, the TCM is easily accessible under the air filter box. With basic tools like a socket set, the swap typically takes less than 30 minutes, making it a very popular repair for DIYers.
Will this part fix a P0700 trouble code?
Yes, in many cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the failure (which is very common), replacing it with this module will resolve the issue and allow you to clear the code.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep or dispose of your old module without any hassle or extra fees.