Restore Your Buick’s Signature Smooth Shifting
Is your 2006-2009 Buick Allure suffering from harsh, erratic shifting, or getting stuck in gear? A faulty Transmission Control Module (TCM) is one of the most common culprits I see in my shop for these symptoms. The TCM is the electronic brain of your automatic transmission, and when it fails, it can make your comfortable sedan feel unpredictable and unsafe. This T42 TCM, equivalent to GM part number 24234274, is the definitive solution, arriving pre-programmed specifically to your vehicle’s VIN for a true plug-and-play repair.
Forget about expensive diagnostic fees and programming charges at the dealership. We handle the complex part for you. By programming the module with the latest GM software updates before it ships, we ensure it communicates flawlessly with your Allure’s engine computer and other systems right out of the box. This restores precise gear changes, proper torque converter lockup, and reliable performance, getting you back on the road with confidence.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Buick Allure with a classic complaint: intermittent ‘clunky’ shifting and a check engine light that would come and go. His local shop had already replaced two shift solenoids, but the problem persisted. Scanning the vehicle, I found a P0700 (Transmission Control System Malfunction) code, which is a general flag. Digging deeper, I saw communication errors between the TCM and the ECM. After 20 years of diagnostics, I know that heat and vibration are the biggest enemies of these modules. In the Allure, the TCM is tucked under the air cleaner housing, where it can get quite hot. We installed one of our VIN-programmed T42 modules, and the problem was solved in under an hour. The customer saved hundreds compared to the dealership’s quote for a new module and programming.
Is Your Allure Exhibiting These Transmission Issues?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2006-2009 Allure TCM problems.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear) and won’t shift up or down.
- ✔ An illuminated Check Engine Light or Transmission Warning Light with codes like P0700, P0750, P0753, or other solenoid-related faults.
- ✔ A sudden drop in fuel economy as the transmission isn’t operating efficiently.
- ✔ Complete loss of communication with the scan tool or no response from the transmission.
A Straightforward Guide to Installation
For the handy DIYer, replacing the TCM on a Buick Allure is a very manageable job that typically takes less than 30 minutes. No specialized tools are required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On the 2006-2009 Buick Allure, the TCM is located directly beneath the lower air cleaner housing. You will need to remove the airbox to access it.
- Disconnect and Remove: Carefully unplug 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. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes.
Verified Fitment for Your General Motors Vehicle
While this is the correct module for the 2006-2009 Buick Allure, this versatile T42 TCM is also a direct replacement for a wide range of GM cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with part numbers 24252114, 24234503, 24230461, and more. Please verify your vehicle in the list below:
- Buick: Allure (06-09), LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
- Chevrolet: Avalanche 1500 (07-08), Cobalt (06-10), Colorado (08-12), Express Van (06-14), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Silverado Pickup (07-13), SSR (05-06), Tahoe (07-09), Trailblazer (06-09)
- GMC: Canyon (08-12), Envoy (06-09), Savana Van (06-14), Sierra Pickup (07-13), Yukon (07-09)
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06), Montana (06-09)
- Saturn: Aura (07-09), Ion (06-07), Vue (07-10)
- Cadillac: DTS (06-11)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
What does ‘VIN Programmed’ actually mean?
What does ‘VIN Programmed’ actually mean?
It means we flash the module with your vehicle’s unique 17-digit Vehicle Identification Number (VIN) before shipping. This ensures the TCM has the correct software and calibration files specifically for your Buick Allure’s configuration, making it a true plug-and-play part without requiring a trip to the dealer for expensive programming.
Will this fix my transmission limp mode?
In a vast majority of cases, yes. Limp mode is a protective measure triggered by the vehicle’s computer when it detects a critical fault. A failing TCM is a very common cause of this condition in GM vehicles. Replacing it with our correctly programmed module typically resolves the issue.
Is this a new or used part?
This is a high-quality, tested component built to meet or exceed original equipment specifications. It is not a new part from the original manufacturer, but it is guaranteed to perform reliably and is backed by our one-year warranty.
Do I need to send my old TCM back?
No, there is no core charge or need to return your old part. You can dispose of it or keep it, saving you the time and hassle of shipping it back.