Is your 2006-2011 Buick Lucerne suffering from frustrating transmission problems like harsh shifting, delayed gear engagement, or getting stuck in limp mode? These are classic signs of a failing Transmission Control Module (TCM). As an automotive diagnostics expert with over two decades of experience, I’ve seen how a faulty TCM can completely ruin the driving experience of an otherwise reliable vehicle. This isn’t just an annoyance; it’s a critical component failure that can affect safety and fuel economy.
This OEM-quality T42 Transmission Control Module, corresponding to part number 24235732, is the definitive solution. We pre-program it to your vehicle’s specific VIN, ensuring it works perfectly right out of the box. This eliminates the need for expensive and time-consuming trips to the dealership for programming. It’s designed to restore the precise, smooth shifting your Lucerne was known for, managing everything from gear selection to torque converter lockup. By replacing your old module, you’re not just fixing a part; you’re restoring your car’s performance and your peace of mind.
Case Study: A Tricky Diagnosis
A customer brought in his 2008 Buick Lucerne with a complaint that stumped two other shops. The car would intermittently refuse to shift out of 2nd gear, and the check engine light was on with a generic P0700 (Transmission Control System Malfunction) code. They had already replaced two shift solenoids with no success. After a quick scan, I suspected the TCM. In my shop, I’ve seen hundreds of these T42 modules fail due to internal circuit board issues caused by heat and vibration. We installed one of our VIN-programmed modules, and the problem was solved in under an hour. The customer was thrilled to have his car back and running smoothly without throwing more money at the wrong parts.
Common Signs of a Failing Lucerne TCM
If you’re experiencing any of the following, your TCM is the likely culprit. A failing module can often be misdiagnosed as a mechanical transmission failure, leading to costly and unnecessary repairs.
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle gets stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related codes.
- ✔ A noticeable decrease in fuel efficiency as the transmission isn’t operating correctly.
- ✔ Complete loss of communication with the module, preventing diagnostics.
A Straightforward Guide to Installation
Replacing the 2006-2011 Lucerne TCM is a job most DIY mechanics can handle in their own garage. No special tools are needed, and the process typically takes less than 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic repair. This prevents electrical shorts and helps reset the vehicle’s systems.
- Locate the Module: On the Buick Lucerne, the TCM is typically found in the engine compartment on the driver’s side (LH), often near the strut tower or under the air cleaner housing.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place and securely reconnect the electrical connectors. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the heavy lifting, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the car and enjoy your smooth-shifting transmission!
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of General Motors vehicles. While this listing is focused on the Buick Lucerne, it is also compatible with many other models. Please verify your part number (24235732) or contact us with your VIN to ensure perfect fitment.
- ✔ Buick Lucerne: 2006-2007 (4.6L), 2008-2011 (All)
- ✔ Buick LaCrosse / Allure: 2006-2009
- ✔ Cadillac DTS: 2006-2011
- ✔ Chevrolet Impala: 2006-2011
- ✔ Pontiac Grand Prix: 2006-2008
- ✔ And many other GM cars, trucks, and SUVs equipped with the T42 TCM.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you time and money. Just provide your VIN at checkout.
Is this part difficult to install myself?
Not at all for most people with basic tools. The module is located in the engine bay and is easily accessible. The entire process should take less than 30 minutes.
What is the warranty on this 2006-2011 Lucerne TCM?
This part is backed by our comprehensive one-year warranty, giving you confidence in the quality and reliability of your repair.
Will this fix my P0700 trouble code?
A P0700 code indicates a general fault in the transmission control system. While a failing TCM is a very common cause, you should ensure other potential issues (like wiring or solenoids) have been ruled out. In most cases where the TCM is the root cause, this part will resolve the code.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without any hassle or need to return it.