Restore Your Buick’s Smooth Ride
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 the most likely culprit. As the electronic brain of your automatic transmission, the TCM is responsible for every gear change. When it fails, it can make your daily drive frustrating and unpredictable. This direct-fit T42 TCM, part number 24255280, is the definitive solution to restore your vehicle’s factory performance and reliability.
Over my 20 years in diagnostics, I’ve seen countless GM vehicles with these exact symptoms. Heat cycles and vibrations eventually cause internal electronic components to fail, leading to poor communication with the transmission’s solenoids. This module is built to OEM specifications to withstand these conditions and provide a lasting repair. The most significant benefit is that we pre-program it to your LaCrosse’s specific Vehicle Identification Number (VIN), making it a true plug-and-play fix that eliminates the need for an expensive trip to the dealership for programming.
A Technician’s Notebook
I recently had a 2008 Buick LaCrosse in the shop that was stuck in ‘limp mode’ (3rd gear only) and throwing a P0752 code for Shift Solenoid ‘A’ Stuck On. The owner had already replaced the solenoid twice with no change. After a quick data stream check, I noticed the command signal from the TCM was erratic. The module was sending faulty signals, not the solenoid. We installed one of our VIN-programmed T42 modules, and the car was shifting perfectly within 30 minutes. This is a classic case where chasing codes can be misleading; the root cause was the controller itself.
Is Your Buick LaCrosse Showing These Transmission Faults?
- âś” Harsh, slamming, or delayed gear shifts.
- âś” Vehicle is stuck in one gear (often called limp mode).
- âś” Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, P0751, or other solenoid-related DTCs.
- âś” Inability to upshift or downshift properly.
- âś” A sudden drop in fuel economy.
- âś” The transmission feels like it’s slipping between gears.
DIY-Friendly Installation Guide for Your LaCrosse
Replacing the 2006-2009 LaCrosse TCM is a straightforward job that most DIYers can complete in under an hour with basic tools. On this specific model, you’ll find it located under the lower air cleaner housing.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electronic work.
- Locate the Module: Access the TCM by removing the air cleaner box assembly. You will see the module mounted below it.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to gently release the locking tabs if needed. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock.
- Final Steps: Reinstall the air cleaner housing and reconnect the battery. While the module is plug-and-play, it’s good practice to use a scan tool to clear any stored fault codes from the vehicle’s memory.
Confirmed Vehicle Compatibility
This T42 Transmission Control Module is a guaranteed fit for the 2006-2009 Buick LaCrosse. It is also compatible with a wide range of other General Motors vehicles that use the 4L60E, 4L65E, and similar 4-speed automatic transmissions. Please verify your part number (24255280) or contact us with your VIN. Other compatible models include:
- Buick: Allure, Lucerne, Rainier, Rendezvous
- Chevrolet: Silverado, Tahoe, Impala, Cobalt, HHR, Express Van
- GMC: Sierra, Yukon, Savana Van, Envoy, Canyon
- Pontiac: G6, Grand Prix
- Cadillac: DTS
- Saturn: Vue, Aura, Ion
- Hummer: H3
Do I need to get this TCM programmed by a dealer?
Do I need to get this TCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for immediate installation, saving you time and money.
What is the warranty on this part?
This transmission control module comes with a one-year warranty, giving you confidence and peace of mind in your repair.
Where is the TCM located on my 2007 Buick LaCrosse?
For the 2006-2009 Buick LaCrosse, the TCM is conveniently located in the engine compartment, situated directly under the lower air cleaner housing.
Will this fix a P0700 trouble code?
A P0700 is a generic code indicating the TCM has detected a fault. Often, the root cause is the TCM itself. Replacing a faulty module with this pre-programmed unit is a very common and effective fix for a P0700 and other related transmission codes.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or recycle it at your convenience without the hassle of returning it.