Restore Your LaCrosse’s Shifting Performance
Is your 2006-2009 Buick LaCrosse suffering from harsh shifts, delayed gear engagement, or getting stuck in limp mode? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, it can lead to frustrating driving experiences, poor fuel economy, and potentially damage other transmission components. This OEM-quality T42 TCM is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play installation.
From the Diagnostic Bay
We had a 2008 Buick LaCrosse come into the shop with a check engine light and a P0700 code. The owner was convinced he needed a full transmission rebuild, quoted at over $3,000 by another shop. After a quick scan, we noticed several solenoid circuit codes pointing to an electrical fault. Instead of tearing down the transmission, we inspected the TCM. After swapping in a VIN-programmed module, all the codes cleared, and the car shifted like it just rolled off the factory floor. It’s a powerful reminder to always check the electronics first—it can save you thousands.
Your Direct Replacement 2006-2009 LaCrosse TCM
Don’t let a faulty module sideline your vehicle. This T42 TCM, also known by service numbers like 24242391 and 24252114, is engineered to meet and exceed original equipment specifications. It directly manages shift solenoids, torque converter lockup, and line pressure, restoring the smooth, predictable performance you expect from your Buick. Because we program the unit with the latest GM software updates using your VIN, you can bypass expensive dealership programming and lengthy wait times.
Common Symptoms of a Failing TCM
- ✔ Harsh, erratic, or delayed shifting between gears.
- ✔ Vehicle is stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The transmission feels like it’s slipping or failing to engage properly.
- ✔ Complete loss of communication with the transmission module.
Installation and Fitment
For the 2006-2009 Buick LaCrosse, the TCM is conveniently located under the lower air cleaner housing, making it accessible for a straightforward replacement. The process typically takes less than an hour with basic hand tools. Simply disconnect the battery, remove the air cleaner assembly to access the old module, unbolt it, disconnect the electrical connectors, and install the new one in its place. Once reconnected, the pre-programmed module will immediately communicate with your vehicle’s systems, restoring proper function without any additional steps.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means this module is ready for installation right out of the box. We use your vehicle’s unique Vehicle Identification Number (VIN) to load the exact software and calibrations your car needs. This eliminates the need for a trip to the dealership for expensive programming, saving you time and money.
Will this fix my transmission-related check engine light codes?
Yes, if the codes (like P0700 or solenoid circuit faults) are being caused by a faulty TCM, this replacement part is designed to resolve those issues. After installation, it’s recommended to clear any stored codes with a standard OBD-II scanner.
Is this a difficult part to install myself?
For most DIY mechanics, this is a relatively simple job. On the LaCrosse, it’s located under the air cleaner box. As long as you are comfortable disconnecting the battery and using basic hand tools, you can typically complete the replacement in under an hour.
How do I know this part is compatible with my vehicle?
This T42 TCM is the correct module for 2006-2009 Buick LaCrosse models. It also interchanges with a wide range of GM part numbers, including 24252114, 24234503, and 24241806. Providing your VIN at checkout guarantees we send you a perfectly matched and programmed unit.
Is there a core charge for my old part?
No, there is no core charge required for this module. You can keep your old part without the hassle of returning it, simplifying the repair process for you.