Is Your Buick LaCrosse Shifting Erratically?
If you’re experiencing harsh shifting, delayed gear engagement, or your 2006-2009 Buick LaCrosse is stuck in ‘limp mode,’ a failing Transmission Control Module (TCM) is the likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can cause a host of frustrating and potentially damaging issues, from poor fuel economy to a complete inability to shift gears. This replacement GM T42 TCM, service number 24255280, is the definitive solution to restore your vehicle’s performance and drivability.
Expert Pro Tip
Before installing your new TCM, always disconnect the vehicle’s battery for at least 15 minutes. This not only ensures your safety but also helps reset the vehicle’s related electronic systems. After installation, use a quality OBD-II scan tool to clear any stored Diagnostic Trouble Codes (DTCs) to ensure the new module can perform its relearn procedure correctly without interference from old fault data.
Symptoms of a Failing LaCrosse Transmission Control Module
A faulty TCM can manifest in several ways. If you notice any of the following symptoms, it’s crucial to diagnose the issue promptly to prevent further damage to your transmission’s mechanical components.
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle gets stuck in a single gear (often 2nd or 3rd), a condition known as ‘limp mode.’
- ✔ Your dashboard illuminates with the Check Engine Light or a specific transmission warning light.
- ✔ Diagnostic scans reveal transmission-related codes, such as the generic P0700 or specific solenoid codes like P0750.
- ✔ A noticeable decrease in fuel efficiency as the transmission isn’t operating in the optimal gear.
- ✔ The transmission may feel like it’s slipping, or you may experience a complete loss of upshifting or downshifting capabilities.
- ✔ Intermittent electrical problems that seem to have no other source.
The Plug-and-Play Solution: VIN-Programmed for Your Vehicle
Dealerships and repair shops often require expensive programming after a new TCM is installed. Our modules eliminate that step entirely. We pre-program this T42 TCM specifically to your vehicle’s Vehicle Identification Number (VIN) before it ships. This ensures that it arrives ready for a true plug-and-play installation. The module will have the latest GM software updates, ensuring it communicates flawlessly with your LaCrosse’s other computers, like the Engine Control Module (ECM), for optimal performance and fuel economy right out of the box.
This unit is a direct replacement for a wide range of original part numbers, including 24252114, 24234503, 24230461, and many more, making it a versatile fix for numerous GM cars, trucks, and SUVs from 2006-2014. Built to strict OEM standards, it guarantees the reliability and durability you need for daily driving. Don’t let a faulty module dictate your driving experience—take control back with a dependable, pre-programmed replacement.
Installation is straightforward for a DIY mechanic or a professional technician. On the 2006-2009 Buick LaCrosse, the TCM is typically located under the lower air cleaner housing in the engine bay. The process generally takes less than an hour and requires basic hand tools. With no core charge, you can complete the repair without the hassle of returning your old part.
Frequently Asked Questions
Do I need to get this TCM programmed by a dealer?
No. This Transmission Control Module comes pre-programmed to your vehicle’s specific VIN. This makes it a plug-and-play solution, saving you the time and expense of a dealership visit for programming.
Will this fix a P0700 trouble code?
A P0700 code is a generic trouble code indicating that the TCM has detected a fault. While this module will often resolve the root cause of the P0700, it’s essential to scan for other, more specific codes (e.g., solenoid circuit faults) to confirm the TCM is the problem. In most cases where the TCM is faulty, replacing it with this unit will clear the code after installation.
Where is the TCM located on my 2007 Buick LaCrosse?
For the 2006-2009 Buick LaCrosse, the TCM is typically found in the engine compartment, situated in the lower air cleaner housing. Always consult a vehicle-specific repair manual to confirm the exact location before beginning work.
Is this compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a vast range of 2006-2014 GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. This includes models like the Chevrolet Silverado, Tahoe, Impala; GMC Sierra, Yukon; Cadillac DTS; and many others.
What is the warranty on this part?
This module is backed by our standard one-year warranty, ensuring it is free from defects in material and workmanship under normal use and service.