If your 2006-2009 Buick Allure is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen how a faulty TCM can mimic a major transmission failure, leading to stress and unnecessary repair quotes. This T42 Transmission Control Module, part number 24252114, is the direct, reliable solution you need. It arrives expertly programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and ensuring a true plug-and-play installation.
The TCM is the electronic brain of your automatic transmission, responsible for managing shift points, torque converter clutch engagement, and line pressure. When it fails, communication breaks down, resulting in the frustrating and sometimes dangerous symptoms you’re experiencing. By replacing your old unit with this quality-tested module, you’re not just swapping a part; you’re restoring the precise, factory-designed performance and reliability to your vehicle’s powertrain. This is the definitive fix for a faulty 2006-2009 Allure TCM and many other compatible GM vehicles.
From the Diagnostic Bay
I remember a 2008 Buick Allure that came into my shop. The owner was convinced her transmission was shot. It was slamming into gear and wouldn’t shift past 2nd. The check engine light was on with a P0700 code. Instead of quoting a multi-thousand dollar transmission job, we scanned for deeper codes and identified a faulty solenoid driver circuit inside the TCM. We installed one of these pre-programmed modules, and in less than an hour, the car was shifting like new. It’s a common failure, and this part saves drivers a fortune by addressing the root electronic issue, not the mechanical symptoms.
Is Your Buick Exhibiting These Transmission Issues?
A failing TCM will give you clear warning signs. If you’re noticing any of the following, it’s time for a replacement:
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-specific codes are present.
- ✔ A noticeable drop in fuel economy or a burning smell from an overheating transmission.
- ✔ Complete loss of communication with the transmission module.
DIY-Friendly Installation: A 30-Minute Fix
Installing your new 2006-2009 Allure TCM is a straightforward job for any DIY enthusiast. For the Buick Allure, you’ll find it located under the lower air cleaner housing. The process is simple and requires basic hand tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic component replacement.
- Locate the Module: On your Allure, access the TCM by removing the air cleaner box assembly.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket and remove it.
- Install the New Module: Mount the new, pre-programmed TCM in place and tighten the bolts. Reconnect the electrical harnesses securely.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a scan tool to clear any stored DTCs from the system.
Verified Fitment for Your General Motors Vehicle
This T42 TCM, interchangeable with part number 24252114, is a direct-fit replacement for a wide range of GM cars, trucks, and SUVs. While this page focuses on the 2006-2009 Allure TCM, it is also compatible with the following models. Please verify your specific model and location notes.
- 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 Vans (06-14), HHR (06-11), Impala (06-11), Malibu (06-10), Monte Carlo (06-07), Silverado Pickups (07-13), SSR (05-06), Suburban 1500 (07-08), Tahoe (07-09)
- GMC: Canyon (08-12), Envoy / Envoy XL (06-09), Savana Vans (06-14), Sierra Pickups (07-13), Yukon / Yukon XL 1500 (07-09)
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06), Montana (06-09), Torrent
- 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
Does this module require additional programming at the dealership?
No. We program the module to your vehicle’s VIN before shipping it. This ensures it is ready for immediate installation without any need for expensive dealer tools or software.
What is the difference between a TCM and a PCM?
The TCM (Transmission Control Module) specifically manages the automatic transmission’s functions. The PCM (Powertrain Control Module) is a more integrated unit that often controls both the engine and transmission. Your vehicle uses a separate TCM, which is the part being sold here.
Is there a core charge for this part?
No, there is no core charge. You are not required to send your old, faulty module back to us, saving you time and return shipping costs.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other issues like bad solenoids or wiring. However, if you are also experiencing erratic shifting, replacing the TCM is the most likely solution.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure correct programming.