Restore Your Buick’s Smooth, Confident Ride
Is your 2006-2009 Buick LaCrosse suffering from jarring shifts, delayed gear engagement, or a frustrating check engine light? A faulty Transmission Control Module (TCM) is often the culprit, disrupting the comfort and reliability you expect from your vehicle. This OEM-quality T42 TCM is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN. This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix that restores your transmission’s precise, factory-fresh performance right out of the box.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, this module is designed to be the direct-fit solution you need:
- Harsh, erratic, or delayed shifting
- The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear)
- Active Check Engine or Transmission warning lights
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes
- Failure to upshift or downshift correctly
- Noticeably poor fuel economy
Installing this pre-programmed 2006-2009 Buick LaCrosse transmission control module directly addresses the electronic brain of your transmission, resolving these frustrating and potentially damaging symptoms.
Features & Tangible Benefits
- ✔ VIN Programmed for Your LaCrosse: We program the module to your car’s VIN before shipping. This ensures perfect communication with your vehicle’s systems for optimal shift patterns and performance, eliminating the need for dealership intervention.
- ✔ Restore Factory Performance: By precisely managing shift points, torque converter lockup, and line pressure, this TCM brings back the smooth, responsive feel your Buick was built for.
- ✔ Solve Annoying Warning Lights: This module is engineered to resolve the root cause of common transmission-related DTCs, helping you clear that check engine light for good.
- ✔ Built to OEM Standards: Manufactured to meet or exceed original equipment specifications, ensuring reliable operation and long-term durability for your daily drive.
- ✔ This unit is backed by our one-year replacement warranty.
From the Technician’s Bench
“We see these T42 modules frequently. A common mistake is installing a used, unprogrammed unit from a salvage yard. This almost never works because the module is still coded to the donor vehicle’s VIN and options. It can cause even more shifting problems or just not work at all. Our VIN programming service is the critical step that makes this a successful, hassle-free repair. By installing a correctly programmed 2006-2009 Buick LaCrosse transmission control module, you’re not just replacing a part; you’re restoring the specific logic your transmission needs to operate flawlessly.”
Frequently Asked Questions
What is VIN programming and why is it essential?
VIN programming loads your vehicle’s unique identification number and factory-specific software onto the module. This allows the TCM to communicate perfectly with the engine computer and other vehicle systems, ensuring correct shift points and transmission behavior. Without it, the module won’t work correctly in your car.
Do I need any special tools for installation?
Basic hand tools like a socket set and ratchet are typically all that’s needed. On the 2006-2009 LaCrosse, the TCM is located in the lower air cleaner housing, making it accessible. We recommend disconnecting the battery before starting and using a basic scan tool to clear any stored codes after installation is complete.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the underlying issue causing the P0700, it’s always wise to have the specific transmission codes read to confirm the diagnosis. This module is designed to fix the internal electronic failures that trigger these codes.
Is there a core charge for my old part?
No, there is no core charge. You can keep or dispose of your old module without the hassle of returning it, saving you time and money.
How can I be sure this 2006-2009 Buick LaCrosse transmission control module is the right part?
This module is a direct replacement for service number 24241806 and a wide range of other interchangeable part numbers listed in the product data. As long as your vehicle is a 2006-2009 Buick LaCrosse, this is the correct pre-programmed module for a seamless repair.