Restore Smooth Shifting to Your 2006-2009 Buick Allure
If your Buick Allure is suffering from harsh shifts, delayed gear engagement, or is stuck in limp mode, the problem often points directly to a failing Transmission Control Module (TCM). As a seasoned technician, I’ve seen how a faulty TCM can mimic the symptoms of a major transmission failure, causing unnecessary stress and diagnostic headaches. This OEM-quality T42 Transmission Control Module, part number 24243921, is the definitive solution, engineered to restore your vehicle’s performance and reliability.
The most significant benefit of this module is that it arrives at your door fully pre-programmed to your vehicle’s specific VIN. This completely eliminates the need for a costly trip to the dealership for programming. It’s a true plug-and-play fix that saves you time and money, whether you’re a DIYer tackling a weekend project or a professional mechanic looking for an efficient, reliable part for a customer’s car.
From the Diagnostic Bay
I remember a 2008 Buick Allure that came into my shop. The owner was distraught, having been told by another shop they needed a full transmission rebuild costing thousands. The car was stuck in 3rd gear (limp mode) and had a P0700 code. I hooked up my scanner and saw erratic data from the shift solenoids. Instead of jumping to the worst-case scenario, I checked the TCM. Sure enough, it was the original unit, a known point of failure. We swapped in a VIN-programmed module like this one, cleared the codes, and the car shifted like it just rolled off the factory floor. It was a 30-minute fix that saved the customer a fortune.
Is Your Buick Exhibiting These Telltale Signs?
A failing TCM will give you clear warnings. If you’re experiencing any of the following, it’s highly likely your Allure Transmission Control Module is the culprit:
- ✔ Harsh, slamming, or erratic gear changes.
- ✔ The vehicle is stuck in a single gear (often 2nd or 3rd) and won’t shift.
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable decrease in fuel economy.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
Installing your new Allure Transmission Control Module is a simple process that typically takes less than 30 minutes with basic hand tools. For the 2006-2009 Buick Allure, the TCM 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.
- Locate the Module: Find the TCM situated beneath the air cleaner assembly. You will need to remove the air cleaner box to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical connectors.
- Final Steps: Reinstall the air cleaner assembly and reconnect the negative battery terminal. Start the vehicle and use a basic scan tool to clear any stored fault codes. No further programming is needed.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this page focuses on the Allure Transmission Control Module, please verify your model and location below. Interchangeable with part numbers: 24252114, 24234503, 24230461, 24243921, and more.
- Allure (2006-2009): Transmission; (lower air cleaner housing)
- Cobalt (2006-2010): Transmission; (LH strut tower)
- Envoy / Trailblazer (2006-2009): Transmission; (LH engine compartment)
- Express / Savana Van (2006-2014): Transmission; (RH engine compartment)
- G6 (2006-2010): Transmission; (LH strut tower)
- Impala / Monte Carlo (2006-2011): Transmission; (lower air cleaner housing)
- Lucerne (2006-2011): Transmission; (LH engine compartment)
- Silverado / Sierra 1500 (2007-2013): Transmission; (next to battery)
- Tahoe / Yukon (2007-2009): Transmission; (next to battery)
- And many more GM models…
Frequently Asked Questions
What exactly does ‘VIN Programmed’ mean for me?
It 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 engine computer and other systems right out of the box, with no dealer intervention required.
Do I need any special tools for this installation?
No special tools are required. A basic socket set to remove the air cleaner housing and the module’s mounting bolts is all you’ll typically need.
Will this part fix a P0700 diagnostic trouble code?
A P0700 is a generic code indicating the TCM has detected a fault. While this module often resolves the root cause of a P0700, it’s always wise to scan for other specific codes (e.g., P0751, P0756) to confirm the diagnosis. In our experience, a faulty TCM is the most common culprit.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or dispose of it at your convenience, making the process hassle-free.
How do I know this is the right part for my car?
You can match the part number 24243921 (or other listed interchange numbers) from your original module. You can also use our vehicle fitment tool or contact our expert support team with your VIN, and we’ll guarantee you get the correct part.