If your 2006-2009 Buick Allure is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light, you’re likely dealing with a failed Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can cripple an otherwise healthy vehicle. This isn’t just an annoyance; it’s a critical component failure that affects drivability and safety. This T42 Transmission Control Module, part number 24241806, is the definitive solution to restore your vehicle’s performance and peace of mind.
The biggest hurdle in replacing a TCM has always been the expensive and time-consuming trip to the dealership for programming. We eliminate that step entirely. We pre-program this module to your vehicle’s specific VIN before it ships, ensuring it’s ready for immediate installation right out of the box. This plug-and-play solution makes it a perfect job for both professional mechanics and determined DIYers looking to save hundreds of dollars.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Buick LaCrosse (which uses the same T42 module as the Allure) with a classic complaint: ‘It bangs into gear and sometimes won’t shift past 2nd.’ His local shop had already replaced two shift solenoids with no luck. I hooked up my scan tool and saw a P0700 (Transmission Control System Malfunction) and an intermittent U0101 (Lost Communication with TCM). Instead of throwing more parts at it, I checked the TCM’s power and ground—they were solid. The issue was internal to the module itself, a common failure point I’ve diagnosed on hundreds of these GM platforms. A new, VIN-programmed TCM like this one solved the problem in under an hour, restoring smooth shifting and clearing all codes for good.
Is Your Buick Allure Showing These Signs?
A failing TCM will give you clear warnings. If you’re experiencing any of the following, it’s time to consider a replacement 2006-2009 Allure Transmission Module.
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Complete loss of communication with the transmission module.
- ✔ Poor fuel economy directly related to incorrect gear selection.
A Straightforward Guide to Installation
Installing your new TCM is a simple process that typically takes less than 30 minutes. For the Buick Allure, you’ll find it 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.
- Locate the Module: Find the old TCM. On your Allure, it’s situated beneath the air cleaner box. You will need to remove the air cleaner assembly to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note their orientation. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical connectors securely.
- Reassemble and Reconnect: Reinstall the air cleaner assembly. 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 scan tool to clear any stored fault codes from the ECU.
Verified Fitment for Your Vehicle
This module, part number 24241806, is a direct replacement for a wide range of General Motors vehicles. While this page focuses on the 2006-2009 Allure Transmission Module, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
- Buick Allure (2006-2009): Located under the lower air cleaner housing.
- Buick LaCrosse (2006-2009): Found at the lower air cleaner housing.
- Chevrolet Cobalt / Pontiac G5 / Saturn Ion (2006-2010): Typically on or behind the LH strut tower.
- Chevrolet Impala / Monte Carlo (2006-2011): Positioned under the lower air cleaner housing.
- Chevrolet Silverado / GMC Sierra (2007-2013): Usually located next to the battery.
- Chevrolet Tahoe / GMC Yukon (2007-2009): Found next to the battery.
- …and many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This is the key benefit of our service. We program the module to your vehicle’s VIN before shipping, so it arrives ready for plug-and-play installation.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a very manageable job. On the Buick Allure, it involves removing the air cleaner box for access. The entire process should take less than an hour.
What if this doesn’t fix my problem?
While this module is a common fix for the symptoms listed, we always recommend proper diagnostics. If the module doesn’t resolve your issue, it may indicate a wiring or mechanical problem within the transmission. Our modules are fully tested and backed by a one-year warranty against defects.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part, so you don’t have to worry about the hassle and expense of shipping it back.