Get Your Buick Allure Shifting Smoothly Again
If your 2006, 2007, 2008, or 2009 Buick Allure is suffering from harsh shifts, getting stuck in gear, or has the check engine light on with transmission codes, you’ve likely pinpointed a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make driving frustrating and unsafe. This isn’t just an inconvenience; it’s a critical failure that impacts performance and fuel economy. Over my 20+ years in the shop, I’ve seen countless GM vehicles with these exact issues, and the root cause is almost always a compromised TCM.
“A customer’s 2007 Allure came in last week with these exact symptomsโit wouldn’t shift past 2nd gear and had a P0700 code stored. The owner was worried about a costly transmission rebuild. We diagnosed the TCM, installed one of our pre-programmed units, and had him back on the road in under an hour with the transmission shifting perfectly. It’s a common, straightforward fix that saves thousands compared to a full transmission replacement.”
Diagnosing a Faulty 2006-2009 Allure Transmission Module
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s time for a replacement:
- โ Harsh, erratic, or delayed gear shifts that slam into place.
- โ Vehicle is stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- โ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- โ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0750-series solenoid codes, or communication errors.
- โ A noticeable drop in fuel efficiency.
- โ The transmission seems to slip between gears or fails to engage from Park to Drive or Reverse.
Plug-and-Play Installation: No Dealer Visit Required
The biggest benefit of this module is our expert VIN programming service. We flash the module with your vehicle’s specific VIN and the latest GM software updates before it ships. This means it arrives ready for a true plug-and-play installation, saving you the time and expense of a trip to the dealership for costly programming.
- 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: On your 2006-2009 Buick Allure, the TCM is conveniently located under the lower air cleaner housing in the engine bay.
- Remove the Old Unit: Carefully disconnect the electrical connectors. Press the release tabs firmly and pull straight out. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed module into place. Reconnect the electrical connectors, ensuring they click securely into position.
- Final Steps: Reconnect the battery terminal. While the system often resets, it’s best practice to use a standard OBD2 scan tool to clear any lingering fault codes from the vehicle’s memory. Start the car and test drive to confirm smooth shifting.
Expert Pro Tip: Inspect Your Connectors
Before plugging in your new TCM, take 30 seconds to inspect the vehicle’s wiring harness connectors. Look for any signs of green or white corrosion on the pins, or any bent or damaged pins. A poor connection can mimic the symptoms of a failed module. Use a small brush and electrical contact cleaner to ensure the connection is perfect. This simple check guarantees your new part can communicate effectively from the start.
OEM-Quality and Guaranteed Compatibility
This T42 TCM is built to meet or exceed original equipment standards for reliability and performance. It is a direct replacement for part numbers including 24235732, 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235753, 24240449, and YNXS. We back our quality with a one-year warranty, giving you peace of mind with your purchase. No core charge is required, so you can complete your repair without the hassle of sending the old part back.