Restore Peak Performance to Your Buick’s Transmission
If your 2006-2009 Buick Allure is suffering from harsh shifting, delayed gear engagement, or has suddenly gone into a frustrating ‘limp mode,’ the root cause is often a failing Transmission Control Module (TCM). As an automotive diagnostician with over two decades of experience, I’ve seen firsthand how a faulty TCM can make a perfectly good car feel unreliable and unsafe. This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s performance and fuel economy. This T42 series TCM, part number 24230461, is the definitive solution, engineered to restore the crisp, predictable shifting you expect from your vehicle.
Case Study: A Tricky Diagnosis
A customer brought in their ’08 Buick LaCrosse (which uses the same TCM as the Allure) with a classic complaint: intermittent, violent shifts and a persistent P0700 code. They’d been to two other shops that couldn’t pinpoint the issue, suggesting a full transmission rebuild costing thousands. After hooking up my scan tool and monitoring live data, I saw erratic solenoid commands originating from the TCM. The internal electronics were breaking down under heat. We installed one of our pre-programmed T42 modules, and in less than an hour of work, the car drove like new. This part saved the customer a massive headache and over $2,500.
The Power of Pre-Programmed, Plug-and-Play Simplicity
The single biggest hurdle in replacing modern electronics is the need for expensive dealership programming. We eliminate that step entirely. Before this module ships, we program it to your vehicle’s specific VIN, loading the latest GM software updates. This ensures it communicates flawlessly with your engine computer and other systems right out of the box. For the DIY mechanic, this means you can perform a professional-level repair in your own driveway with basic hand tools. For the professional technician, it means a faster, more profitable job without relying on a dealer’s schedule. This 2006-2009 Allure TCM is your direct path to resolving common transmission issues for good.
Is Your Buick Allure Showing These Red Flags?
- ✔ Harsh, slamming, or erratic gear shifts.
- ✔ The vehicle is stuck in one gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750, or other solenoid-related faults.
- ✔ Failure to upshift or downshift properly.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Intermittent loss of communication with the TCM.
Your 30-Minute Path to a Smooth Ride
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the onboard systems.
- ✔ Locate the Module: On the Buick Allure, the TCM is typically found bolted to the lower air cleaner housing in the engine compartment. It’s a silver box with electrical connectors.
- ✔ Disconnect and Remove: Carefully unplug the electrical harnesses. Then, unbolt the module from its mounting bracket.
- ✔ Install the New TCM: Mount your new, VIN-programmed 2006-2009 Allure TCM in place and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- ✔ Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the car and enjoy a smooth test drive!
Verified Fitment for Your General Motors Vehicle
While this is the correct module for your Buick Allure, it also serves as 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:
Fits: Allure (06-09), LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07), Terraza (06-07), Uplander (06-09), DTS (06-11), Avalanche (07-08), Cobalt (06-10), Colorado (08-12), Express/Savana Vans (06-14), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Silverado/Sierra (07-13), SSR (05-06), Suburban (07-08), Tahoe/Yukon (07-09), Trailblazer/Envoy (06-09), Canyon (08-12), Hummer H3 (08-10), G5/G6 (06-10), Grand Prix (06-08), Montana (06-09), Pursuit (06), Aura (07-09), Ion (06-07), Vue (07-10), Saab 9-7X (06-09), and more. Please confirm your specific model and options.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This module comes fully programmed to your vehicle’s VIN number. It is a true plug-and-play solution, saving you time and the high cost of dealership programming.
Where is the TCM located on my 2007 Buick Allure?
On the 2006-2009 Buick Allure, the Transmission Control Module is typically mounted directly to the lower air cleaner housing in the engine bay, making it easily accessible for replacement.
Will this fix a P0700 transmission fault code?
A P0700 code is a general fault request from the TCM to the main engine computer. In many cases where the TCM itself has failed, replacing it with this programmed unit will resolve the root cause of the P0700 and related transmission codes.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module, eliminating the hassle and expense of shipping a core back.
What kind of warranty is included?
This module is backed by a one-year warranty, giving you peace of mind and confidence in your repair.