Restore Your Buick’s Signature Smoothness
As a technician with over two decades of experience, I’ve seen countless drivers worry that their transmission is failing when the real culprit is a faulty Transmission Control Module (TCM). For your 2006-2011 Buick Lucerne, the TCM is the electronic brain that dictates every shift, ensuring the power from your V6 or V8 engine is delivered seamlessly. When it starts to fail, you’ll feel it immediately—harsh shifts, delayed gear engagement, or even the dreaded ‘limp mode.’ This isn’t just an annoyance; it’s a critical failure that impacts drivability, fuel economy, and safety.
This replacement T42 TCM, part number 24256960, is the definitive solution. We pre-program it to your vehicle’s specific VIN, which means it arrives ready for a true plug-and-play installation. No expensive trips to the dealership for programming are necessary. By installing this module, you’re not just replacing a part; you’re restoring the precise, factory-intended operation of your transmission, clearing persistent diagnostic trouble codes (DTCs), and preventing the potential for more severe mechanical damage down the line.
From the Diagnostic Bay: The Lucerne That Dodged a Rebuild
A customer brought in their ’08 Lucerne, convinced they needed a full transmission rebuild. The car was banging into gear and wouldn’t shift past 3rd. The quote from another shop was over $3,000. I hooked up my scan tool and immediately saw a classic P0700 code, which is a general transmission fault request, but more specifically, I found codes related to solenoid circuit failures. In my experience, these T42 modules are a common point of failure. Instead of a rebuild, we installed a VIN-programmed TCM. The total repair took less than an hour, and the car shifted like it just rolled off the showroom floor. The customer saved thousands and was back on the road the same day. It’s a perfect example of why proper diagnosis is key.
Is Your Lucerne Exhibiting These Transmission Faults?
A failing 2006-2011 Lucerne TCM often presents clear warning signs. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Harsh, erratic, or delayed shifting between gears.
- ✔ The vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The transmission feels like it’s slipping or failing to engage properly.
A Straightforward Guide to Installation
Replacing the TCM on your Buick Lucerne is a job most DIYers can handle in their own garage. For the 2006-2011 Lucerne, you’ll find the TCM located in the left-hand (driver’s side) of the engine compartment. Follow these simple steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: Open the hood and find the TCM on the driver’s side of the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the electrical wiring harnesses. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. While our programming resolves most issues, it’s good practice to use a basic scan tool to clear any stored DTCs from the vehicle’s memory.
Verified Fitment for Your General Motors Vehicle
While this is a direct-fit solution for the 2006-2011 Lucerne TCM, this versatile T42 module is also compatible with a wide range of other GM vehicles. Please verify your model and options below. This part is interchangeable with service numbers including 24242391, 24234503, 24252114, and more.
- Buick Lucerne: 2006-2007 (4.6L), 2008-2011 (All) – Located in LH engine compartment.
- Buick Allure/LaCrosse: 2006-2009 – Located in lower air cleaner housing.
- Cadillac DTS: 2006-2011 – Located in RH front engine compartment.
- Chevrolet Impala/Monte Carlo: 2006-2011 – Located in lower air cleaner housing.
- Chevrolet Trucks/SUVs (Silverado, Tahoe, etc.): Various years – Typically next to the battery.
- …and many other GM models listed in the compatibility chart.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. This ensures it is ready for immediate installation without any additional programming or dealer visits, saving you time and money.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without the hassle of returning it.
What warranty is included with this part?
This Transmission Control Module comes with a one-year warranty, covering any defects in materials or workmanship for your peace of mind.
Will this fix a P0700 trouble code?
A P0700 code is a general fault indicator sent by the TCM to the main engine computer (ECM) to turn on the Check Engine Light. While this module often resolves the underlying issue causing the P0700 (like a solenoid fault), you should scan for more specific P-codes (e.g., P0751, P0756) to confirm the TCM is the root cause.
Where is the TCM located on a 2008 Buick Lucerne?
On the 2008-2011 Buick Lucerne, the Transmission Control Module is located in the engine compartment on the driver’s side (LH side).