End Your Buick’s Shifting Nightmares for Good
If you’re dealing with a 2006-2009 Buick Allure that shifts harshly, gets stuck in gear, or has thrown a transmission-related check engine light, you know how frustrating it can be. As a technician with over two decades of experience, I’ve seen countless drivers worry about a complete transmission failure when the real culprit is a faulty Transmission Control Module (TCM). The TCM is the brain of your automatic transmission, and when it fails, it causes chaos. This isn’t just an inconvenience; it’s a safety concern and can lead to more expensive damage if ignored.
This T42 Transmission Control Module is the definitive solution. We take the guesswork and extra cost out of the repair by programming it directly to your vehicle’s VIN before it ships. This means it arrives ready for a true plug-and-play installation, restoring the crisp, predictable shifting you expect from your Buick without a mandatory trip to the dealership for expensive programming.
A Technician’s Notebook
I recently had a 2008 Buick LaCrosse (which uses the same T42 module as the Allure) come into the shop. The customer was experiencing intermittent ‘no-shift’ conditions and a P0700 code that would come and go. They had already replaced two shift solenoids with no luck. After a quick diagnostic, I suspected the TCM was failing internally, likely due to heat cycles and vibration causing hairline cracks in the circuit board. Instead of another expensive guess, we ordered a VIN-programmed module. The installation took less than 30 minutes, and the problem was solved instantly. The customer saved hundreds on diagnostic labor and avoided a costly dealership visit.
Is Your Allure Exhibiting These Transmission Issues?
A failing TCM will give you clear warning signs. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement. Addressing it now with the correct 2006-2009 Allure TCM can prevent further damage to your transmission’s mechanical components.
- ✔ Harsh, banging shifts or erratic gear changes.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light is on with Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction), P0750, or other solenoid-specific codes.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Failure to upshift or downshift, leading to poor acceleration and fuel economy.
- ✔ Complete loss of communication with the module.
Simple Installation for Your Buick Allure
One of the best features of this module is its straightforward installation. For the 2006-2009 Buick Allure, you’ll find the TCM located under the lower air cleaner housing, making it accessible for any DIY enthusiast or professional mechanic.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On your Allure, remove the air cleaner assembly to access the TCM mounted below it.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs, as old plastic can be brittle. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the electrical harnesses. You should hear a click as they lock.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery. While the module is pre-programmed, it’s good practice to use a scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your General Motors Vehicle
This T42 TCM, part number 24256960, is a direct replacement for a wide range of GM vehicles. Please confirm your model and the specified location below. This module is interchangeable with part numbers: 24252114, 24234503, 24230461, 24234274, 24235340, and more.
This part will fit these makes and models with these options:
ALLURE 06-09 Transmission; (lower air cleaner housing)
AURA 07-09 Transmission; (LH frame rail front)
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 06-09 Transmission; (LH engine compartment)
EXPRESS VANS 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)
… and many other GM models.
Frequently Asked Questions
Does this 2006-2009 Allure TCM require any additional programming?
No. This module is fully programmed to your vehicle’s specific VIN before shipping. It is ready for installation right out of the box, with no need for a trip to the dealer.
Is there a core charge for my old part?
No, we do not require a core return. You can keep your old module, which saves you the time and hassle of shipping it back.
What kind of warranty is included?
This transmission control module comes with a one-year replacement warranty, giving you peace of mind and confidence in your repair.
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 fault, replacing it with our programmed unit will resolve the code and the underlying issue.
Where is the TCM located on my 2007 Buick Allure?
For the 2006-2009 Buick Allure, the transmission control module is located underneath the lower portion of the air cleaner housing in the engine bay.