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 a mechanic with over two decades of diagnostic experience, I’ve seen firsthand how a faulty TCM can mimic a catastrophic transmission failure, causing immense stress for vehicle owners. This T42 Transmission Control Module, part number 24235340, is the definitive solution to restore your vehicle’s smooth, predictable performance.
The core of the problem with these modules often lies in internal circuit board failures due to heat and vibration over time. This leads to miscommunication between the engine and transmission, resulting in the frustrating symptoms you’re experiencing. This replacement 2006-2009 Allure TCM is built to meet or exceed original equipment standards, ensuring long-term reliability. The most significant benefit is that we program it to your vehicle’s specific VIN before shipping. This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix that you or your mechanic can perform quickly.
A Technician’s Notebook
I recall a 2008 Buick Allure that came into my shop. The owner was distraught, having been quoted over $3,000 for a transmission rebuild at another shop. The car was shifting hard from 1st to 2nd and occasionally throwing a P0752 code (Shift Solenoid ‘A’ Stuck On). Instead of jumping to conclusions, we checked the basics. The fluid was clean, and the solenoids tested fine electrically. The real issue was the TCM, which was sending erratic voltage to the solenoid. We installed a VIN-programmed module just like this one, cleared the codes, and the car drove like new. The customer saved thousands and drove away with a reliable car, all thanks to a correct diagnosis and the right part.
Is Your Buick Exhibiting These Transmission Woes?
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, slamming, or delayed gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Inability to shift into higher or lower gears.
- ✔ Poor fuel economy and a feeling of sluggishness.
- ✔ Complete loss of communication with the transmission.
DIY-Friendly Installation in Under 30 Minutes
Replacing the TCM on your Buick Allure is a straightforward job that most DIYers can handle with basic tools. No complex procedures or dealership visits are required.
- Locate the Module: On the 2006-2009 Allure, the TCM is typically found attached to the lower air cleaner housing.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. 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.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. Use a basic OBD2 scanner to clear any stored fault codes.
- Test Drive: Take the vehicle for a test drive to confirm that shifting is smooth and all warning lights are off.
Verified Fitment Across the GM Family
While this part is a direct fit for your Buick Allure, this versatile T42 module is also compatible with a wide range of other General Motors vehicles. It is interchangeable with part numbers 24242391, 24252114, 24234503, and more, making it a trusted solution for many models, including:
- ✔ Buick LaCrosse, Lucerne, Rendezvous
- ✔ Chevrolet Silverado, Tahoe, Impala, Cobalt, HHR, Express Van
- ✔ GMC Sierra, Yukon, Savana Van, Envoy
- ✔ Pontiac G6, Grand Prix
- ✔ Saturn Vue, Aura, Ion
- ✔ And many more from 2006-2014.
Frequently Asked Questions
Frequently Asked Questions
Does this 2006-2009 Allure TCM require programming?
No. We pre-program the module to your car’s VIN before it ships. It arrives ready for immediate installation, saving you a trip to the dealer.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM. While a faulty TCM is a very common cause, you should confirm there are no other underlying issues. In most cases where the TCM has failed, this part will resolve the code.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without any hassle or need to return it.
What is the warranty on this part?
This transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your repair.
Where is the TCM located on my 2007 Buick Allure?
For the 2006-2009 Buick Allure, the TCM is located under the hood, mounted to the lower portion of the air cleaner housing assembly.