Restore Peak Performance to Your Buick’s Transmission
Are you experiencing frustrating and unpredictable shifting in your 2006-2009 Buick LaCrosse? Issues like harsh gear changes, getting stuck in limp mode, or an illuminated check engine light can point directly to a failing Transmission Control Module (TCM). This critical component is the brain of your automatic transmission, and when it malfunctions, it can disrupt your entire driving experience. This genuine quality GM T42 Transmission Control Module, service number 24256960, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a seamless, plug-and-play installation.
From the Diagnostic Bay
We recently had a 2008 Buick LaCrosse come into the shop with classic symptoms of a bad TCM. The owner reported erratic shifting, especially when cold, and the transmission would occasionally refuse to shift out of 2nd gear. A scan revealed a P0700 (Transmission Control System Malfunction) code. Instead of a costly and time-consuming transmission rebuild, we identified the T42 module as the culprit. After installing one of our VIN-programmed units, the car shifted flawlessly on the test drive. The customer was back on the road in under an hour, avoiding a massive repair bill and dealership headaches.
Is Your Buick LaCrosse Showing These Symptoms?
- ✔ Harsh, erratic, or delayed gear shifting that makes driving uncomfortable.
- ✔ The vehicle is stuck in a single gear, often referred to as “limp mode.”
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are present.
- ✔ A noticeable decrease in fuel economy due to inefficient transmission operation.
- ✔ Complete failure to shift gears or engage the transmission from park.
Why Choose Our 2006-2009 LaCrosse Transmission Module?
This isn’t just a replacement part; it’s a comprehensive solution designed for long-term reliability. The most significant benefit is our professional VIN programming service. We flash the module with the latest GM software updates specific to your LaCrosse before it ships. This crucial step ensures the TCM communicates perfectly with your vehicle’s engine computer and other systems, eliminating the need for an expensive trip to the dealership for programming. It’s a true plug-and-play fix that restores the smooth, precise shifting you expect from your Buick.
Key Features & Benefits
- VIN-Programmed for Your Vehicle: Simply provide your VIN at checkout, and we handle the rest. The module arrives ready for immediate installation, ensuring optimal performance and resolving common electronic faults.
- Restore Smooth Operation: By precisely controlling shift points, line pressure, and torque converter lockup, this module eliminates hard shifts and gear hunting, improving both performance and fuel efficiency.
- Built to OEM Standards: Manufactured to meet or exceed original equipment specifications for durability and function. It’s backed by a one-year warranty for your peace of mind.
- Broad Compatibility: This T42 module is a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24230461, 24234274, and 24256960, among others.
- No Core Charge: Keep your old part without any additional fees or the hassle of returning a core.
Straightforward Installation
For the 2006-2009 Buick LaCrosse, the TCM is typically located in the lower air cleaner housing, making it accessible for a DIY mechanic. The process generally takes less than 30 minutes. Always disconnect the vehicle’s battery before starting the installation to allow the onboard systems to reset. Once the new module is installed and the battery is reconnected, use a standard OBD2 scan tool to clear any lingering diagnostic codes. Your transmission’s performance will be immediately restored.
Frequently Asked Questions
What does a Transmission Control Module do?
The TCM is a computer that processes data from various sensors on your vehicle’s engine and transmission. It uses this information to control shift solenoids, regulate fluid pressure, and manage torque converter lockup to ensure smooth, efficient gear changes.
Do I need to take my car to a dealer after installing this part?
No. Because we pre-program the module to your vehicle’s VIN, you do not need to visit a dealership or repair shop for additional programming. This is a plug-and-play solution.
Is this LaCrosse Transmission Module difficult to install?
For someone with basic mechanical skills, the installation is straightforward. It involves locating the module (under the air cleaner box on a LaCrosse), disconnecting the battery, swapping the electrical connectors, and securing the new module. The entire process typically takes under 30 minutes.
How can I be sure the TCM is the problem, not the transmission itself?
While a professional diagnosis is best, TCM failure often presents with electronic symptoms like specific trouble codes (P0700), erratic behavior that comes and goes, or getting stuck in one gear. Mechanical transmission failures often involve slipping, grinding noises, or a complete loss of movement.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) at the time of purchase. This allows us to load the correct software and calibrations for your specific Buick LaCrosse, ensuring perfect compatibility.