Restore Your Buick’s Smooth Shifting Performance
If your 2006-2009 Buick LaCrosse is suffering from harsh shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is often the culprit. As a technician with over two decades of experience, I’ve seen countless GM vehicles, including the LaCrosse, sidelined by these exact issues. The TCM is the brain of your automatic transmission, and when it fails, it can cause unpredictable and unsafe driving conditions. This isn’t just an annoyance; it’s a critical component for your vehicle’s reliability. This direct-fit T42 TCM, part number 24243901, is the definitive solution to get your car driving like new again.
We take the guesswork and high dealership costs out of the equation. Each module is expertly programmed to your vehicle’s specific VIN before it ships. This means no expensive trips to the dealer for programming—it’s a true plug-and-play fix. By installing this module, you are addressing the root cause of many common transmission problems, ensuring precise gear changes, proper torque converter lockup, and restored communication between your engine and transmission. Don’t let a faulty module dictate your driving experience. A replacement 2006-2009 LaCrosse Transmission Module is the reliable path to a smooth ride and peace of mind.
Case Study: A Tricky Diagnosis
I remember a 2008 LaCrosse that came into my shop. The owner was frustrated because the car would intermittently refuse to shift out of 2nd gear, especially after it warmed up. Another shop had already replaced a shift solenoid, but the problem persisted. After hooking up my scan tool, I saw a generic P0700 code but also intermittent communication loss with the TCM. Instead of throwing more parts at it, we tested the module’s circuits and confirmed the TCM itself was failing internally. We installed one of these VIN-programmed units, and the problem was solved permanently. It’s a classic example of how a faulty 2006-2009 LaCrosse Transmission Module can mimic other transmission issues.
Is Your Buick LaCrosse Showing These Telltale Signs?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode,” often in 2nd or 3rd gear.
- ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, or other solenoid-specific codes.
- ✔ Inability to upshift or downshift, leading to poor acceleration and fuel economy.
- ✔ The transmission seems to slip between gears or feels like it’s in neutral.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
For the Buick LaCrosse, this is a job most DIYers can handle in their driveway. The module is typically located under the air cleaner housing, making it easily accessible. You’ll be back on the road in under an hour.
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your LaCrosse, remove the air cleaner assembly to access the TCM mounted below it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount the new, VIN-programmed TCM in place of the old one and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Reassemble and Finalize: Reinstall the air cleaner housing. Reconnect the battery terminal. Start the vehicle and use a basic OBD2 scan tool to clear any stored fault codes from the computer’s memory.
Verified Fitment for Your General Motors Vehicle
While this is a direct solution for the 2006-2009 LaCrosse Transmission Module, this T42 unit is also compatible with a wide range of other GM vehicles, making it a versatile and reliable part for professional mechanics and multi-car owners. This module interchanges with part numbers 24252114, 24234503, 24230461, and others. Please verify your specific model in the list below.
Do I need to take this module to a dealer for programming?
Do I need to take this module to a dealer for programming?
No. The main benefit of our service is that we program the module to your car’s VIN before shipping. This makes it a true plug-and-play installation, saving you hundreds in 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 in the engine bay, situated directly underneath the lower air cleaner housing. You will need to remove the airbox to access it.
Will this fix a P0700 trouble code?
A P0700 code is a generic fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. While a faulty TCM can cause this code, it’s often accompanied by more specific codes. Replacing a failing TCM is a very common and effective way to resolve a P0700 and its related codes.
Is there a core charge for this part?
No, we do not require a core charge. You can keep your old part, so you don’t have to worry about the hassle and expense of shipping it back.