If your 2006-2009 Buick Allure is suffering from harsh shifting, getting stuck in gear, or throwing transmission-related trouble codes, you’re likely dealing with a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise reliable vehicle. This T42 series module, part number 24239926, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
This isn’t just a replacement part; it’s a restoration of your vehicle’s core performance. The TCM is the brain of your automatic transmission, controlling everything from shift points and line pressure to torque converter clutch engagement. When it fails, the symptoms can range from annoying to dangerous. Our module is built to strict OEM specifications, ensuring it communicates flawlessly with your vehicle’s Powertrain Control Module (PCM) and other systems, eliminating the guesswork and the need for an expensive trip to the dealership for programming.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Buick Allure with classic symptoms: it would intermittently refuse to shift out of 2nd gear, and the check engine light was on with a P0700 (Transmission Control System Malfunction) code. They had already replaced two shift solenoids with no change. After confirming the wiring harness had good continuity, my attention turned to the TCM. Heat soak and vibrations from its location under the air cleaner housing had caused internal circuit failure. Installing one of our VIN-programmed T42 modules not only fixed the shifting issue instantly but also cleared the P0700 code for good. This is a common failure point I’ve diagnosed hundreds of times on these GM platforms.
Is Your Buick Exhibiting These Telltale Signs?
A failing TCM often gives clear warnings. If you’re experiencing any of the following, it’s time to consider a replacement:
- âś” Harsh, slamming shifts or delayed gear engagement.
- âś” Vehicle is stuck in a single gear (often called “limp mode”).
- âś” Check Engine Light is illuminated with codes like P0700, P0750, or other solenoid-specific DTCs.
- âś” Complete loss of upshifting or downshifting capabilities.
- âś” A noticeable drop in fuel economy.
- âś” No communication with the TCM when using a diagnostic scan tool.
A Straightforward Guide to Installation
For the DIY mechanic, this is a very manageable job that typically takes less than 30 minutes. On the 2006-2009 Buick Allure, the TCM is located under the lower air cleaner housing.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Access the Module: Remove the air cleaner assembly to gain clear access to the TCM.
- Disconnect and Remove: Carefully unclip 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 connectors. You should hear a click as they lock in.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery. Start the vehicle and allow it to run for a few minutes. If you have a basic scan tool, it’s good practice to clear any stored codes.
Verified Compatibility for Your Vehicle
This module is a direct-fit replacement for your 2006-2009 Allure Transmission Module and is also compatible with a wide range of other GM vehicles. It interchanges with part numbers 24252114, 24234503, 24239926, and more. Please see the detailed list below:
- Buick Allure (2006-2009): Located in the lower air cleaner housing.
- Buick LaCrosse (2006-2009): Located in the lower air cleaner housing.
- Chevrolet Impala (2006-2011): Located in the lower air cleaner housing.
- Pontiac Grand Prix (2006-2008): Located in the lower air cleaner housing.
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please verify your part number or contact us with your VIN.
Frequently Asked Questions
Does this module really not require dealer programming?
That’s correct. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation, saving you time and the typical $150+ dealership programming fee.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of returning it.
Will this fix a P0700 trouble code?
In many cases, yes. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the failure, replacing it with our pre-programmed unit will resolve the code.
What tools do I need for installation on my Buick Allure?
You’ll only need basic hand tools: a socket set to remove the air cleaner housing and unbolt the module, and a flathead screwdriver or trim tool to help release the electrical connector clips. No special diagnostic equipment is required.