Restore Your Vehicle’s Shifting Performance
If your 2006-2009 Buick Allure is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light with transmission codes, a failing Transmission Control Module (TCM) is the most likely cause. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and monitoring system health. When it fails, it can cause a cascade of frustrating and potentially damaging issues. This genuine OEM-quality T42 TCM, part number 24256960, is the definitive solution to restore your vehicle’s factory performance and reliability.
The Plug-and-Play Solution: Pre-Programmed for Your Allure
Forget expensive dealership visits and complex programming procedures. We take the guesswork out of the repair by pre-programming this module to your vehicle’s specific Vehicle Identification Number (VIN) before shipping. This ensures that the unit arrives ready for a direct, plug-and-play installation. It will have the latest GM software updates, ensuring optimal communication between your engine and transmission for improved fuel efficiency and flawless shifting logic right out of the box. This is the most efficient way to get your car back on the road without the need for specialized scan tools or costly labor.
From the Diagnostic Bay
We recently had a customer with a 2008 Chevy Impala (which uses this same T42 module) who had spent hundreds of dollars replacing shift solenoids, thinking they were the problem. The harsh 1-2 shift and P0700 code kept returning. After a quick diagnostic, we identified the root cause: a failing TCM that was sending incorrect signals to the new solenoids. By installing a VIN-programmed 2006-2009 Allure TCM (compatible with his Impala), we solved the issue in under an hour. This highlights the importance of correctly diagnosing the electronic controller before replacing internal transmission components.
Common Symptoms of a Failing GM T42 TCM
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle stuck in “limp mode,” often in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are stored.
- ✔ Failure to upshift or downshift properly.
- ✔ Decreased fuel economy and potential transmission overheating.
- ✔ Complete loss of communication with the transmission.
Broad Compatibility Across the GM Family
While this is a perfect fit for your Buick Allure, this versatile T42 module is the heart of many popular GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is a direct replacement for a wide array of models including the Chevrolet Silverado, Tahoe, Impala, Cobalt; GMC Sierra, Yukon; Cadillac DTS; Pontiac G6, and many more. This module interchanges with numerous part numbers, including 24252114, 24234503, and 24242391, making it a reliable choice for a vast range of repairs.
Installation is straightforward for a DIY mechanic or professional technician. The module is typically located in the engine bay—often near the battery, on a strut tower, or under the air cleaner box. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one. Reconnect everything, and you’re ready to go. With no core charge, you can keep or dispose of your old part without any hassle.
Frequently Asked Questions
What is VIN programming and why is it required?
VIN programming loads your vehicle’s specific software and calibrations onto the TCM. This is crucial for ensuring the transmission shifts correctly based on your car’s engine, tire size, and other factory parameters. Our pre-programming service makes this a plug-and-play part, saving you a trip to the dealership.
Can I install this 2006-2009 Allure TCM myself?
Yes, this is a common DIY repair. The module is located in the engine compartment and is typically held in place by a few bolts with accessible electrical connectors. The most important steps are disconnecting the battery beforehand and ensuring the connectors are seated securely on the new module. The entire process often takes less than 30 minutes.
Will this fix transmission codes like P0700?
Yes. A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the problem is the TCM itself. Replacing a faulty module with this pre-programmed unit will resolve the root cause of P0700 and related solenoid codes.
Do I need to return my old part? Is there a core charge?
No, there is absolutely no core charge for this part. You are not required to send your old, faulty module back to us, which simplifies the repair process for you.
Is this compatible with other GM vehicles?
Absolutely. This T42 TCM is used in a wide range of GM cars, trucks, and SUVs from roughly 2006 to 2014, including models like the Chevy Silverado, GMC Yukon, Pontiac G6, and Saturn Vue. Please check the fitment list on this page to confirm compatibility with your specific vehicle.