Restore Your Buick’s Performance with a Pre-Programmed Transmission Control Module
If your 2006-2011 Buick Lucerne is suffering from frustrating and unpredictable transmission behavior, you’re not alone. Symptoms like harsh gear changes, getting stuck in one gear, or a persistent check engine light can make driving a stressful experience. The culprit is often a failing Transmission Control Module (TCM). This replacement T42 TCM, part number 24239224, is the definitive solution, arriving expertly programmed to your vehicle’s specific VIN for a true plug-and-play repair that restores the smooth, reliable performance you expect from your Buick.
A Technician’s Notebook: The Intermittent Shifting Mystery
I once had a 2008 Buick Lucerne in my bay with a complaint that stumped two other shops. The owner described occasional, violent shifts from first to second gear, but only after the car was fully warmed up. There were no consistent trouble codes, just a generic P0700 (Transmission Control System Malfunction) stored in history. After checking fluid levels and solenoids, which all tested fine, I focused on the TCM. On these GM platforms, heat soak in the engine bay can cause failing electronic components inside the TCM to act up intermittently. We installed a VIN-programmed 2006-2011 Lucerne TCM, and the problem vanished instantly. It’s a classic case where the mechanical parts are fine, but the brain directing them is failing.
Is Your Buick Lucerne Showing These Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution your vehicle needs.
- ✔ Sudden, harsh, or delayed gear shifting.
- ✔ The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758 (solenoid circuit faults), or communication errors.
- ✔ A noticeable decrease in fuel economy.
- ✔ The transmission seems to slip out of gear or fails to engage properly from Park.
A Straightforward Guide to Installation
Replacing the TCM on your Lucerne is a job most DIY enthusiasts can handle in their own garage in under 30 minutes. No specialized tools are required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic component replacement.
- Locate the Module: On the 2006-2011 Buick Lucerne, the TCM is conveniently located in the left-hand (driver’s side) of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and securely fasten the bolts. Reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any old fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for the 2006-2011 Lucerne TCM and is also compatible with a wide range of other General Motors vehicles. It is interchangeable with part numbers including 24252114, 24234503, 24230461, 24234274, 24239224, 24256960, and more. Below is a partial list of confirmed applications:
- Buick Lucerne: 2006-2011
- Buick Allure / LaCrosse: 2006-2009
- Cadillac DTS: 2006-2011
- Chevrolet Impala / Monte Carlo: 2006-2011
- Chevrolet Silverado / GMC Sierra: 2007-2013 (various configurations)
- Chevrolet Tahoe / GMC Yukon: 2007-2009 (various configurations)
- Pontiac G6 / Grand Prix: 2006-2010
Note: This is not an exhaustive list. Please verify your part number or contact us with your VIN to ensure perfect fitment.
Do I need to take my car to the dealer for programming?
Do I need to take my car to the dealer for programming?
No. This transmission control module comes fully programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you the time and expense of a dealership visit.
Is a core charge required?
No, there is no core charge. You can keep your old part without any obligation to return it, making the process simple and hassle-free.
What tools are needed for installation?
You’ll only need basic hand tools, typically a socket set to remove the mounting bolts and potentially a small flathead screwdriver to help release the electrical connector clips. No special electronic equipment is necessary.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal failure or solenoid driver faults), it’s important to ensure other transmission components are in good working order. In the vast majority of cases I’ve seen, replacing a faulty TCM clears the P0700 code and any related specific codes.