End Your Transmission Headaches for Good
If you’re dealing with a 2006-2009 Buick Allure that shifts harshly, hesitates, or has a mind of its own, you’re not alone. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a failing Transmission Control Module (TCM). The T42 module, the electronic brain of your automatic transmission, is a common failure point. When it goes bad, it can cause a cascade of frustrating and potentially damaging problems, from poor fuel economy to getting stuck in limp mode. This isn’t just an annoyance; it’s a reliability issue that needs a dependable fix.
This is the definitive solution: a high-quality T42 TCM, part number 24230461, that comes fully programmed to your vehicle’s specific VIN. This means no expensive trips to the dealership for programming. You get a part that is ready for installation right out of the box, restoring the precise, smooth shifting your Allure had from the factory.
Case Study: The Ghost in the Transmission
A customer brought in a 2008 Buick LaCrosse (which uses the same T42 system as the Allure) with a maddeningly intermittent problem. It would slam into gear one day and drive perfectly the next. They had already replaced two shift solenoids based on generic codes, but the issue persisted. After hooking up my pro-level scan tool and monitoring live data during a test drive, I saw the TCM intermittently lose communication and command erratic line pressure. The internal electronics were failing under heat stress. We installed one of our VIN-programmed TCMs, and the problem was solved permanently. This is why a quality, correctly programmed 2006-2009 Allure Transmission Module is critical—it addresses the root cause, not just the symptoms.
Is Your Buick Allure Showing These Telltale Signs?
- ✔ Harsh, erratic, or delayed gear shifts that make driving unpleasant.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Your Check Engine Light or Transmission Warning Light is on.
- ✔ You have Diagnostic Trouble Codes (DTCs) stored, such as the general P0700 or solenoid-specific codes like P0751, P0752, P0756, etc.
- ✔ A sudden drop in fuel efficiency or the transmission seems to be overheating.
- ✔ Complete loss of communication with the TCM, preventing shifting altogether.
Your Straightforward 30-Minute Installation Guide
Installing your new 2006-2009 Allure Transmission Module is a job most DIYers can handle with basic tools. For the 2006-2009 Allure, the TCM is conveniently located under the lower air cleaner housing, making it easily accessible.
- 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, which is situated directly beneath the air cleaner box in the engine bay. You may need to remove the air cleaner assembly to gain access.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Press the release tabs firmly. 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. Reconnect the electrical connectors, ensuring they click securely into position. Reinstall the air cleaner assembly.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a scan tool to clear any old fault codes from the vehicle’s memory. Start the car and enjoy smooth shifting!
Verified Fitment for Your General Motors Vehicle
While this is the correct part for your Buick Allure, this T42 TCM is also compatible with a wide range of other GM vehicles. Please verify your specific model and year below. Part Number 24230461 is interchangeable with: 24252114, 24234503, 24234274, 24235340, and more.
This part will fit these makes and models with these options
ALLURE 06-09 Transmission; (lower air cleaner housing)
AVALANCHE 1500 07-08 Transmission; (next to battery)
CANYON 08-12 Transmission; (RH rear engine compartment)
COBALT 06-10 Transmission; (LH strut tower)
COLORADO 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
ENVOY 08-09 Transmission; (LH engine compartment)
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
G5 07-10 Transmission; (LH strut tower)
G6 06-10 Transmission; (LH strut tower)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HHR 06-11 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
ION 06-07 Transmission; (behind LH strut tower)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
LUCERNE 08-11 Transmission; (LH engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
MONTANA 06-09 Transmission; (LH strut tower)
PURSUIT 06 Transmission; (LH strut tower)
RAINIER 06-07 Transmission
RENDEZVOUS 06-07 Transmission; (air cleaner box)
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SIERRA 1500 PICKUP 08-13 Transmission; (next to battery), w/o hybrid option
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 08-13 Transmission; (next to battery), w/o hybrid option
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SSR 05-06 Transmission; (front LH frame)
SUBURBAN 1500 07-08 Transmission; (next to battery)
TAHOE 07-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
TERRAZA 06-07 Transmission; (LH strut tower)
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
TRAILBLAZER 08-09 Transmission; (LH engine compartment)
TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
UPLANDER 06-09 Transmission; (LH strut tower)
VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
VUE 09 Transmission; 2.4L, (LH front engine compartment)
VUE 10 Transmission
YUKON 07-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
YUKON XL 1500 07-08 Transmission; (next to battery)
Frequently Asked Questions
What does “VIN Programmed” mean for me?
It means we load your car’s specific 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, eliminating the need for a dealership to program it. It’s a true plug-and-play solution.
Will this fix my transmission error code P0700?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause. Replacing it with this pre-programmed module is a very common and effective way to clear the P0700 and related specific codes (like for solenoids) for good.
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 assembly are all you should need. The entire process typically takes less than 30 minutes.
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 shipping it back, saving you time and money.