Restore Smooth, Reliable Shifting to Your Buick Allure
If your 2006-2009 Buick Allure is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, the problem often points directly to a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the TCM is responsible for every gear change, torque converter lockup, and diagnostic check. When it fails, it can make your car unpredictable and unsafe to drive. This T42 series TCM, part number 24240449, is the definitive, hassle-free solution to get your vehicle back to factory-spec performance.
Over my two decades of hands-on diagnostics, I’ve seen hundreds of GM vehicles with these exact symptoms. A faulty TCM can mimic more severe mechanical issues, leading to expensive and unnecessary repairs. This module is pre-programmed to your vehicle’s specific VIN, eliminating the need for a costly trip to the dealership for flashing. It arrives ready for a direct, plug-and-play installation, making it a perfect fix for both professional mechanics and savvy DIY enthusiasts.
From the Diagnostic Bay: The Intermittent Allure
A customer brought in a 2008 Buick Allure with a frustrating problem: it would shift perfectly for days, then suddenly start banging into gear and throw a P0700 code. They’d already replaced a shift solenoid with no luck. After connecting my scan tool, I noticed the live data from the TCM would occasionally drop out, indicating an internal electronic fault. Instead of a costly transmission teardown, we installed this exact VIN-programmed TCM. The problem was solved instantly, saving the customer over a thousand dollars in diagnostic time and unnecessary parts. This is a classic case where the right part is the only fix.
Is Your Buick Exhibiting These Shifting Problems?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s highly likely your 2006-2009 Allure TCM is the culprit:
- ✔ Harsh, delayed, or erratic gear shifts that feel like the transmission is slamming into gear.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (e.g., P0751, P0756).
- ✔ Poor acceleration and a noticeable drop in fuel economy.
- ✔ Complete loss of communication with the TCM, preventing shifting altogether.
A Straightforward Guide to TCM Replacement
Replacing the TCM on your Buick Allure is a job most people can handle in their own garage in under 30 minutes. No specialized tools are required. For the 2006-2009 Allure, the module is conveniently located under the lower air cleaner housing.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Access the Module: Remove the air cleaner assembly to gain clear access to the TCM mounted below it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery terminal. Start the vehicle and use a basic OBD2 scanner to clear any stored fault codes. Take the car for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
While this listing is for the 2006-2009 Allure TCM, this module is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E and 4L65E. It is interchangeable with part numbers 24252114, 24234503, 24240449, and more. Common compatible models include:
- Buick Allure (2006-2009) – Found under the lower air cleaner housing.
- Buick LaCrosse / Lucerne
- Chevrolet Impala / Monte Carlo / HHR / Cobalt
- Chevrolet Silverado / Tahoe / Suburban (often next to the battery)
- GMC Sierra / Yukon / Savana Van
- Pontiac G6 / Grand Prix
- Saturn Vue / Aura
- And many more from 2006-2014.
Frequently Asked Questions
Why is VIN programming so important?
VIN programming ensures the TCM has the correct software and shift strategies for your specific vehicle’s engine, transmission, and tire size. This prevents compatibility issues, error codes, and poor performance. Our service saves you a trip to the dealer and guarantees it works right out of the box.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of sending it back, simplifying your repair process.
Will this fix a P0700 trouble code?
Yes, in many cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the fault, replacing it will resolve the code and the underlying issue.
What tools do I need for installation?
For a Buick Allure, you will typically only need a basic socket set to remove the air cleaner assembly and the TCM mounting bolts, and a wrench to disconnect the battery. No special electronic tools are required.
How do I provide my VIN?
You can enter your vehicle’s 17-digit VIN during the checkout process. We cannot ship the module until we have this information to perform the programming.
What if this doesn’t fix my problem?
While this module fixes the most common shifting issues, your problem could also be related to wiring, solenoids, or internal transmission components. Our pre-programmed module helps by confidently ruling out the TCM, allowing you or your mechanic to diagnose other potential issues more effectively.