If your 2006-2009 Buick Allure is suffering from erratic shifting, getting stuck in gear, or throwing transmission-related codes, you’re not just dealing with an annoyance—you’re facing a classic case of Transmission Control Module (TCM) failure. As a technician with over two decades of experience, I’ve seen how a faulty TCM can make a perfectly good car feel unreliable. This T42 Transmission Control Module, part number 24256960, is the definitive solution, arriving at your door pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
The TCM is the brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and monitoring system health. When it fails, the communication breaks down, leading to the frustrating symptoms you’re likely experiencing. Our module restores that critical link, ensuring your Allure’s 4-speed automatic transmission operates with the precision and smoothness it had from the factory. Forget about expensive dealership visits for programming—we handle that for you, saving you time and money.
A Technician’s Notebook
I remember a 2008 Buick Allure that came into the shop with a complaint that was driving the owner crazy. The car would shift perfectly for days, then suddenly start banging into gear and get stuck in 3rd (limp mode). The check engine light was intermittent. The customer had already replaced two shift solenoids at another shop with no success. After hooking up my scan tool and monitoring live data, I saw the TCM was intermittently dropping communication. It was a textbook thermal failure—working fine when cold, but failing as the engine bay heated up. We installed a VIN-programmed 2006-2009 Allure TCM, and the problem was solved instantly. It’s a reminder that chasing symptoms without addressing the root cause can be costly.
Is Your Buick Allure Showing These Signs?
A failing TCM often broadcasts clear warning signs. If you’re noticing any of the following, it’s a strong indicator that this module is the component you need to replace.
- ✔️ Harsh, delayed, or unpredictable gear shifts.
- ✔️ Vehicle is stuck in “limp mode” and will not shift out of 2nd or 3rd gear.
- ✔️ Check Engine Light or Transmission Warning Light is illuminated.
- ✔️ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0750, or other solenoid-related codes.
- ✔️ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔️ Complete loss of communication with the transmission, leading to a no-shift condition.
DIY Installation in Under 30 Minutes
Replacing the 2006-2009 Allure TCM is a straightforward job that most DIYers can handle with basic tools. Because it’s pre-programmed, the hardest part of the job is simply locating and swapping the module.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electronic repair.
- Locate the Module: On the 2006-2009 Buick Allure, the TCM is conveniently located under the lower air cleaner housing. You will need to remove the airbox to gain access.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. 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 harnesses. You should hear a click as they lock in.
- Final Steps: Reinstall the air cleaner housing and reconnect the battery. While the module is plug-and-play, it’s good practice to use a scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your Vehicle
This module is a direct-fit replacement for the original part in the following vehicles, ensuring seamless integration and performance. It is interchangeable with part numbers 24252114, 24234503, 24230461, and others.
- Buick Allure: 2006, 2007, 2008, 2009 (Located at lower air cleaner housing)
- Buick LaCrosse: 2006-2009 (Located at lower air cleaner housing)
- Chevrolet Impala: 2006-2011 (Located at lower air cleaner housing)
- Chevrolet Monte Carlo: 2006-2007 (Located at lower air cleaner housing)
- Pontiac Grand Prix: 2006-2008 (Located at lower air cleaner housing)
- …and many other GM models including the Tahoe, Silverado, Cobalt, G6, and more. Please verify your part number or contact us to confirm compatibility.
Frequently Asked Questions
Frequently Asked Questions
What exactly is VIN programming?
VIN programming means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your car’s other computers, like the Engine Control Module (ECM), right out of the box. It eliminates the need for an expensive trip to the dealership.
Do I need any special tools for this installation?
No special tools are required. Basic hand tools like a socket set and screwdrivers to remove the air cleaner housing are all you’ll need. A code scanner is helpful for clearing old codes but not mandatory for the module to function.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old module or dispose of it at your convenience without the hassle of sending it back to us.
Will this fix a P0700 trouble code?
Yes. The P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, replacing a faulty 2006-2009 Allure TCM is the direct fix for the issue that triggered the P0700 code in the first place.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.