Restore Peak Transmission Performance in Your Buick LaCrosse
Is your 2006-2009 Buick LaCrosse suffering from erratic shifting, getting stuck in gear, or displaying a check engine light? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and ensuring overall drivetrain efficiency. When it fails, it can lead to frustrating and potentially damaging driving conditions. This genuine-quality T42 TCM, service part number 24240449, is the definitive solution to restore your vehicle’s factory performance and reliability.
Expert Pro Tip
Before installing your new TCM, it’s a wise practice to disconnect the vehicle’s battery for at least 15 minutes. This not only ensures your safety but also helps clear any residual fault codes from the vehicle’s memory, allowing the new, pre-programmed module to establish clean communication with the Powertrain Control Module (PCM) and other vehicle systems from the moment you start the engine.
Symptoms of a Failing T42 TCM
- ✔ Harsh, delayed, or unpredictable gear shifts that disrupt your driving experience.
- ✔ The vehicle entering “limp mode,” often getting stuck in 2nd or 3rd gear as a protective measure.
- ✔ Illumination of the Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (e.g., P0751, P0756).
- ✔ A complete inability to shift up or down, leading to poor acceleration and decreased fuel economy.
- ✔ Intermittent electrical problems that seem to have no other source.
The Plug-and-Play Solution: A Programmed 2006-2009 LaCrosse TCM
What sets this module apart is our expert VIN programming service. Dealerships often require you to buy the part and then pay significant labor costs for programming. We eliminate that step entirely. By providing your vehicle’s VIN during checkout, you receive a module that is loaded with the latest GM software specific to your LaCrosse. This ensures it communicates flawlessly with your vehicle’s systems right out of the box, for a true plug-and-play installation. No trips to the dealer, no expensive scan tools required—just a straightforward repair.
This T42 TCM is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While it’s a perfect fit for the 2006-2009 LaCrosse, it is also compatible with numerous other models, including the Chevrolet Silverado, GMC Sierra, Pontiac G6, and Cadillac DTS, making it a versatile and reliable component for many GM owners.
Installation and Compatibility
For the Buick LaCrosse, the TCM is typically located under the lower air cleaner housing, making it accessible for a DIY repair in under an hour with basic tools. This module is a direct replacement for multiple part numbers, including 24252114, 24234503, 24240400, and 24240449. By installing our pre-programmed 2006-2009 LaCrosse TCM, you are not just replacing a part; you are restoring the precise, smooth operation your vehicle was designed to deliver.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. We pre-program the module to your vehicle’s specific VIN before shipping. This means it is ready for installation right out of the box, saving you time and money on dealership programming fees.
Where is the TCM located on my 2007 Buick LaCrosse?
On the 2006-2009 Buick LaCrosse, the Transmission Control Module is typically found attached to the lower air cleaner housing in the engine bay. Always consult a vehicle-specific repair manual to confirm the exact location.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other transmission issues. Replacing a known-bad TCM is the most frequent solution for this code.
Is this a new or used part?
This is a high-quality, OEM-standard component that has been thoroughly inspected and prepared to meet or exceed original factory specifications, ensuring long-lasting reliability and performance.
What is the warranty on this part?
This transmission control module comes with a one-year warranty, giving you peace of mind with your purchase.