Restore Flawless Shifting to Your Buick Allure
Is your 2006-2009 Buick Allure suffering from jerky shifting, getting stuck in gear, or throwing transmission codes? Don’t let a faulty Transmission Control Module (TCM) ruin your driving experience. As a technician with over two decades of experience, I’ve seen how a failing TCM can mimic more severe transmission problems, leading to costly and unnecessary repairs. This high-quality T42 TCM, part number 24240400, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play fix.
This module is the brain of your automatic transmission, precisely managing shift points, torque converter clutch engagement, and line pressure. When it fails, the symptoms can be alarming. Our replacement restores the crisp, predictable performance you expect from your vehicle, eliminating the guesswork and getting you back on the road with confidence. Stop throwing parts at the problem and get the correct, pre-configured component designed for your car.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Buick Allure with a classic complaint: intermittent harsh 1-2 shifts and a P0700 code. They had already replaced two shift solenoids based on a generic code reader’s suggestion, with no improvement. After a quick data stream analysis, I noticed erratic line pressure commands from the TCM. Instead of tearing into the transmission, we swapped in a VIN-programmed T42 module. The problem vanished instantly. This is a perfect example of how a faulty module can send you on a wild goose chase. This pre-programmed 2006-2009 Allure TCM saves hours of diagnostic time and prevents unnecessary mechanical work.
Is Your Buick Showing These Symptoms?
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700, P0750, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift.
- ✔ Poor fuel economy and a feeling of sluggishness.
- ✔ Intermittent loss of communication with the module.
A Straightforward Guide to Installation
Replacing the 2006-2009 Allure TCM is a job most DIYers can handle in their own driveway in under 30 minutes. The module is conveniently located for easy access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the TCM: On the Buick Allure, you’ll typically find the TCM situated under the lower air cleaner housing. You may need to remove the airbox for access.
- 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, VIN-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into place.
- Final Steps: Reinstall the air cleaner housing and any other components you removed. Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a scan tool to clear any old stored fault codes.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct replacement for part number 24240400 and interchanges with several other GM service numbers. While this page is focused on the 2006-2009 Allure TCM, it also fits a wide range of GM vehicles. Please verify your specific model below:
- ALLURE 06-09 Transmission; (lower air cleaner housing)
- LACROSSE 06-09 Transmission; (lower air cleaner housing)
- IMPALA 06-11 Transmission; (lower air cleaner housing)
- MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
- GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
- COBALT 06-10 Transmission; (LH strut tower)
- G5 07-10 Transmission; (LH strut tower)
- PURSUIT 06 Transmission; (LH strut tower)
- HHR 06-11 Transmission; (LH engine compartment)
- ION 06-07 Transmission; (behind LH strut tower)
- G6 06-10 Transmission; (LH strut tower)
… and many other GM cars, trucks, and SUVs. Please use our vehicle selector tool to confirm an exact match.
Frequently Asked Questions
Frequently Asked Questions
Do I need to take my car to the dealer for programming?
No. This module comes fully programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you a trip to the dealership and their programming fees.
What tools do I need for installation?
Basic hand tools are all that’s required. Typically, a socket set to remove the mounting bolts and possibly a screwdriver or trim tool to help with the airbox removal is sufficient.
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.
What kind of warranty is included?
This part is backed by our one-year, hassle-free warranty, giving you peace of mind with your purchase.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the ECM to turn on the check engine light. If the underlying cause is a faulty TCM, then yes, replacing it with this unit will resolve the code and the related specific transmission faults.