If you’re dealing with the frustration of a Buick Allure that shifts erratically, gets stuck in gear, or throws transmission-related check engine lights, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen countless drivers worry that these symptoms mean a costly transmission rebuild is imminent. More often than not, the culprit is a failing Transmission Control Module (TCM)—the electronic brain that manages every shift.
This T42 TCM, part number 24235732, is the definitive solution for your 2006-2009 Buick Allure. Unlike a generic part that requires an expensive trip to the dealership for coding, this module arrives at your door fully programmed to your vehicle’s specific VIN. This ensures perfect communication with your car’s engine computer and other systems right out of the box, restoring the smooth, predictable performance you expect from your vehicle.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Buick Allure with classic symptoms: it would slam into gear from a stop and sometimes refuse to shift past 2nd gear (limp mode). They had already replaced two shift solenoids with no improvement. A quick scan showed a P0700 (Transmission Control System Malfunction) and an intermittent solenoid circuit code. Instead of chasing ghosts in the wiring, my experience pointed straight to the TCM. Heat cycles and vibrations cause internal solder joints to fail over time, leading to exactly these kinds of unpredictable electrical faults. We installed a VIN-programmed module, and the car drove off the lift shifting like new. This is the power of addressing the root cause.
Is Your Buick Exhibiting These Telltale Signs?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement:
- âś” Harsh, jerky, or delayed gear shifts.
- âś” The vehicle is stuck in a single gear, often called “limp mode.”
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750-P0758, or other solenoid-related faults.
- âś” A noticeable drop in fuel economy due to inefficient shifting.
- âś” The transmission seems to slip out of gear or fails to engage properly.
A Straightforward Guide to Installation
One of the best features of this repair is its simplicity. For the 2006-2009 Allure Transmission Module, the part is located in the engine bay, not inside the transmission. This makes it an accessible job for a confident DIYer or a quick task for a professional mechanic.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On the Buick Allure, the TCM is typically found underneath the lower air cleaner housing. You will need to remove the airbox to gain access.
- Disconnect and Remove: Carefully unclip the electrical connectors from the old TCM. 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. You should hear a click as they lock in.
- Final Steps: Reinstall the air cleaner housing and reconnect the battery. The vehicle is now ready to be started. While our programming resolves most codes, it’s good practice to clear any stored DTCs with a scan tool.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page focuses on the Buick Allure, it also fits:
- Buick: LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
- Chevrolet: Cobalt (06-10), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Silverado, Tahoe, Express Van
- GMC: Envoy (06-09), Sierra, Yukon, Savana Van
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08)
- Saturn: Aura (07-09), Ion (06-07), Vue (07-10)
- And many more. Always verify your part number or contact us with your VIN to ensure a perfect match.
Frequently Asked Questions
Is any additional programming required after installation?
No. This module is expertly programmed to your vehicle’s VIN before it ships. This makes it a true plug-and-play solution, saving you a trip to the dealership and additional programming fees.
Where is the TCM located on my 2007 Buick Allure?
On the 2006-2009 Buick Allure, the Transmission Control Module (TCM) is located in the engine compartment, situated under the lower part of the air cleaner housing.
Will this fix a P0700 trouble code?
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 essential to ensure the transmission itself and its wiring are in good condition. In many cases, replacing a faulty TCM will clear the P0700 and related specific codes.
Do I need to return my old part?
No, there is no core charge for this part. You can keep your old module or recycle it locally, making the process simple and hassle-free.
What is the warranty on this part?
This part is backed by our one-year warranty, giving you peace of mind and confidence in your repair.