Restore Flawless Shifting to Your Buick Allure
If you’re dealing with the headaches of a faulty transmission—like harsh gear changes, a car that won’t shift, or a persistent check engine light—you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen countless drivers frustrated by these exact issues. This T42 Transmission Control Module (TCM), part number 24239224, is the definitive, reliable solution for your 2006-2009 Buick Allure. It’s not just a replacement part; it’s a direct fix that restores the smooth, predictable performance your vehicle had when it was new.
The core of the problem with many transmission failures isn’t the hard parts, but the electronics that control them. This module is the brain of your automatic transmission, managing everything from shift points to torque converter lockup. When it fails, the symptoms can be alarming. Our pre-programmed 2006-2009 Allure Transmission Module eliminates the guesswork and the expensive trip to the dealership for programming. We flash the module with your vehicle’s specific VIN and the latest GM software before it even ships, ensuring it’s ready for immediate installation right out of the box.
A Technician’s Notebook: The Misleading Solenoid Code
A customer once brought in a 2008 LaCrosse (which uses the same T42 module as the Allure) with a P0752 code, indicating a ‘Shift Solenoid A Stuck On’ condition. A less experienced mechanic might have immediately recommended a costly internal transmission repair, dropping the pan and replacing the solenoid. However, after 20 years of diagnostics, I know that the TCM is often the true culprit. We checked the solenoid’s resistance and wiring—both were fine. The issue was that the TCM itself was failing and sending erratic signals, falsely triggering the solenoid code. We installed a VIN-programmed TCM, cleared the codes, and the car shifted perfectly. The customer saved hundreds of dollars and hours of unnecessary labor by correctly identifying the root cause.
Is Your Allure Exhibiting These Transmission Woes?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your transmission control module needs replacement:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle feels stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as the general P0700 code or specific solenoid codes (e.g., P0750, P0751, P0752).
- ✔ The transmission refuses to upshift or downshift properly.
- ✔ A noticeable drop in fuel economy.
- ✔ Intermittent electrical behavior related to the transmission.
A Straightforward Guide to Installation
For the DIY enthusiast, this is a very manageable job that typically takes less than 30 minutes. The 2006-2009 Allure Transmission Module is conveniently located for easy access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On your Buick Allure, the TCM is found underneath the lower air cleaner housing. You will need to remove the air cleaner assembly to access it.
- 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.
- Reassemble and Reconnect: Reinstall the air cleaner housing and reconnect the negative battery terminal.
- Final Steps: Start the vehicle. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 TCM is a direct fit for a wide range of General Motors vehicles, ensuring OEM-level function across many platforms. While this page focuses on the Buick Allure, it is also compatible with the following models (please verify your specific model and location):
- Buick: Allure (06-09), LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
- Chevrolet: Avalanche (07-08), Cobalt (06-10), Colorado (08-12), Express Vans (06-14), HHR (06-11), Impala (06-11), Malibu (06-10), Monte Carlo (06-07), Silverado (07-13), SSR (05-06), Suburban (07-08), Tahoe (07-09)
- GMC: Canyon (08-12), Envoy (06-09), Savana Vans (06-14), Sierra (07-13), Yukon (07-09)
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06)
- Saturn: Aura (07-09), Ion (06-07), Vue (07-10)
- Cadillac: DTS (06-11)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
Frequently Asked Questions
What exactly is VIN programming and why do I need it?
VIN programming is the process where we load your vehicle’s unique Vehicle Identification Number (VIN) and the corresponding GM factory software onto the module. This ensures the TCM communicates perfectly with your car’s engine computer and other systems, controlling shift points and pressures correctly for your specific model. It makes the part truly plug-and-play, avoiding a mandatory and expensive trip to the dealership.
Is this part difficult to install myself?
Not at all for most DIYers. The module is located under the air cleaner box on the Allure, which is accessible with basic hand tools. The entire process should take less than half an hour. Our step-by-step guide above walks you through it.
Will this module fix my P0700 check engine light code?
Yes, in most cases. P0700 is a generic code indicating the TCM has detected a fault. When the failing TCM is the source of the problem, replacing it with this pre-programmed unit will resolve the underlying issue and allow the code to be cleared permanently.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old module or dispose of it without the hassle of shipping it back to us, saving you time and money.
What kind of warranty comes with this part?
We stand by the quality of our electronic components. This transmission control module comes with a one-year warranty, giving you confidence and peace of mind in your repair.