Restore Flawless Shifting to Your Buick LaCrosse
If you’re dealing with the frustration of a Buick LaCrosse that slams into gear, refuses to shift, or is stuck in limp mode, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As an automotive diagnostician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfectly good vehicle. This isn’t just an annoyance; it’s a critical component failure that impacts your car’s performance, fuel economy, and safety. This OEM-quality T42 TCM, part number 24256960, is the definitive, hassle-free solution, pre-programmed specifically to your vehicle’s VIN for a true plug-and-play repair.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 LaCrosse with classic symptoms: harsh 1-2 shifts and intermittent ‘Transmission Hot’ warnings, even on cool days. They’d already replaced two shift solenoids at another shop with no success. After hooking up my scan tool, I saw erratic data from the TCM and a history of solenoid circuit codes. Instead of throwing more parts at it, we identified the root cause—internal failure within the original TCM. In my shop, I’ve seen this hundreds of times on these GM platforms. A new, properly programmed TCM resolved all the issues in under an hour, saving the customer from a potential transmission rebuild. This highlights why starting with the ‘brain’ is often the most effective repair strategy.
Is Your LaCrosse Exhibiting These Telltale Signs?
A failing TCM doesn’t heal itself; the symptoms only get worse. If you’re noticing any of the following, it’s time for a replacement. A new 2006-2009 LaCrosse TCM is the most common fix for these issues.
- ✔ Hard, jerky, or delayed gear shifts that disrupt your drive.
- ✔ The vehicle is stuck in a single gear (often 2nd or 3rd), known as “limp mode.”
- ✔ Your check engine light or transmission warning light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- ✔ A sudden, complete loss of shifting ability, leaving you stranded.
- ✔ Poor acceleration and a noticeable drop in fuel efficiency.
Your 30-Minute Path to a Smooth Ride
One of the best features of this module is its straightforward installation, which most DIYers can complete with basic hand tools. For the 2006-2009 Buick LaCrosse, the TCM is conveniently located under the lower air cleaner housing.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Access the Module: Remove the air cleaner housing to expose the old TCM. It will have several electrical connectors attached.
- Swap the Part: Carefully unplug the wiring harnesses from the old module. Unbolt it from its mounting bracket and set it aside. Bolt the new module in its place.
- Connect and Secure: Firmly re-attach the wiring harnesses to your new TCM. You should hear a ‘click’ as they lock into place. Reinstall the air cleaner housing.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Why Our Programmed 2006-2009 LaCrosse TCM is the Superior Choice
This isn’t just another part; it’s a complete solution. We handle the complex part for you. By programming the module to your specific VIN before it ships, we eliminate the need for expensive dealership visits or specialized programming tools. It arrives ready to install, loaded with the latest GM software updates to ensure optimal shift patterns and torque converter lockup. Built to meet or exceed OEM specifications and backed by a one-year warranty, it’s a repair you can count on.
Verified Vehicle Compatibility
While this is the perfect solution for the 2006-2009 LaCrosse TCM, this versatile T42 module is also the correct fit for a wide array of other General Motors vehicles. It is interchangeable with part numbers 24252114, 24234503, 24242391, and more. Key compatible models include:
- ✔ Buick Allure (2006-2009) & Lucerne (2006-2011)
- ✔ Chevrolet Impala (2006-2011), Cobalt (2006-2010), HHR (2006-2011)
- ✔ Pontiac G6 (2006-2010) & Grand Prix (2006-2008)
- ✔ Saturn Aura (2007-2009) & Vue (2007-2010)
- ✔ And many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to send my VIN number?
Yes. To ensure a true plug-and-play experience, we must program the module to your vehicle’s specific 17-digit VIN. Please provide it during checkout.
Is this a difficult part to install myself?
Not at all. For most DIY enthusiasts with basic tools, this is a job that takes less than 30 minutes. The location under the air cleaner on the LaCrosse is easily accessible.
Will this fix my P0700 check engine light code?
A P0700 code is a general transmission fault request from the TCM. In a vast majority of cases where the TCM itself has failed, replacing it with this programmed module will resolve the root cause of the P0700 and related codes.
Do I need to return my old part (core charge)?
No. We do not require you to return your old, faulty module. There is no core charge, saving you time and the hassle of return shipping.
What if I still have problems after installation?
While this module fixes the most common transmission electronic issues, it’s important to ensure your transmission’s mechanical components are in good health. Our module comes with a one-year warranty and our expert support team is here to help diagnose any further issues.