Is Your Buick Allure Shifting Erratically or Stuck in Gear?
If you’re dealing with the frustration of a transmission that won’t shift correctly, you’re not alone. The Transmission Control Module (TCM) is the brain of your automatic transmission, and when it fails, it can cause a host of problems that make your 2006-2009 Buick Allure feel unreliable. You might be experiencing harsh, banging shifts, a delay when moving from Park to Drive, or the dreaded “limp mode” where the car won’t shift out of a single gear, leaving you stranded on the side of the road.
“A customer’s 2007 Buick Allure came in last week with these exact symptoms. The check engine light was on, and it felt like it was getting rear-ended every time it shifted from first to second gear. A quick scan showed a P0700 (Transmission Control System Malfunction) code. Instead of a costly and time-consuming transmission rebuild, the fix was simple: replacing the faulty original TCM with a reliable, pre-programmed module. The car was shifting like new in under an hour.”
Diagnose Your Failing TCM: Common Symptoms
Over my 20+ years in the shop, I’ve seen these T42 modules fail in consistent ways. Look out for these tell-tale signs in your Allure:
- ✔ Harsh, abrupt, or unpredictable gear changes.
- ✔ The vehicle feels stuck in one gear (often 2nd or 3rd) and won’t upshift or downshift.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are present.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ The transmission seems to slip or hesitate during acceleration.
Why Our 2006-2009 Allure Transmission Module is the Right Choice
This isn’t just a replacement part; it’s a complete solution. We eliminate the biggest headache of TCM replacement: the need for expensive dealership programming. Each module is professionally programmed to your vehicle’s specific VIN before it ships, ensuring it communicates perfectly with your car’s computer systems right out of the box.
- ✔ VIN Programmed for Your Allure: We load the latest GM software calibrated to your exact vehicle. This ensures optimal shift points, torque converter lockup, and fuel efficiency without any extra steps.
- ✔ OEM-Standard Reliability: Built to meet or exceed original equipment specifications for a long service life. This module restores the precise electronic control your transmission needs for smooth operation.
- ✔ One-Year Warranty: We stand behind our parts with a comprehensive one-year warranty, giving you confidence in your repair.
- ✔ Broad Interchange Compatibility: This T42 module, service part 24235340, is a direct replacement for numerous other part numbers, including 24252114, 24234503, 24230461, and more.
Plug-and-Play Installation: No Dealer Visit Required
For the Buick Allure, this is a straightforward DIY job that can be done with basic hand tools. In your vehicle, the TCM is typically located under the lower air cleaner housing.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: Find the TCM, which is situated beneath the air cleaner assembly on your Allure.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note the tab locations to avoid damage. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed module into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Expert Pro Tip: Before you even unbolt the old module, take a bright light and inspect the main electrical connector pins for any signs of green or white corrosion. Moisture intrusion is a common issue on these platforms and can mimic TCM failure. A little bit of electronic contact cleaner and a small brush can sometimes resolve intermittent issues and will ensure your new module has a perfect connection.