Is your 2006-2011 Buick Lucerne suffering from jarring shifts, delayed gear engagement, or a frustrating check engine light? These are classic signs of a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make your comfortable sedan feel unpredictable and unsafe. This T42 TCM, corresponding to part number 24255280, is the definitive solution to restore the smooth, reliable performance you expect from your Buick.
Over my 20 years in diagnostics, I’ve seen countless vehicle owners worry about needing a full transmission rebuild when the real culprit was a simple electronic module. The T42 TCM is notorious for causing intermittent issues that can be a nightmare to diagnose. Our solution takes the guesswork out of the repair. We pre-program each module to your car’s specific Vehicle Identification Number (VIN), ensuring it communicates flawlessly with your vehicle’s systems right out of the box. This means no expensive trips to the dealership for programming—a savings of both time and money.
A Technician’s Notebook
I remember a 2008 Lucerne with the 4.6L V8 that rolled into the shop. The customer was convinced his transmission was shot. It would slam into gear from a stop and sometimes refuse to shift past 3rd gear on the highway. He was quoted over $3,000 for a transmission rebuild elsewhere. After hooking up my scan tool, I saw a generic P0700 code and a few solenoid circuit faults. Experience told me to check the TCM first. The module’s internal circuits were failing under heat, causing erratic signals. We installed one of our VIN-programmed T42 modules, and in less than an hour, the car was shifting like it just left the factory. A potential multi-thousand-dollar repair turned into a simple, affordable fix. That’s the power of accurate diagnostics and a quality part.
Is Your Buick Lucerne Showing These Transmission Issues?
- âś” Harsh, abrupt, or erratic gear changes that disrupt your drive.
- âś” The vehicle is stuck in “limp mode,” often locked in 2nd or 3rd gear.
- âś” Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- âś” Delayed engagement when shifting from Park to Drive or Reverse.
- âś” Poor acceleration and a noticeable drop in fuel economy.
- âś” Complete failure to shift, leaving you stranded.
DIY Installation: Get Your Lucerne Shifting Smoothly in Minutes
- âś” Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- âś” Locate the Module: On the 2006-2011 Buick Lucerne, the TCM is typically found in the left-hand (driver’s side) of the engine compartment.
- âś” Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- âś” Install the New Module: Mount your new, pre-programmed TCM in the same location and securely fasten it. Reconnect the electrical harnesses, ensuring they click into place.
- âś” Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD-II scan tool to clear any stored fault codes from the vehicle’s memory. Start the car and enjoy a smooth ride!
Verified Vehicle Compatibility
This module is a direct-fit replacement for the following vehicles, ensuring a perfect match for your repair needs.
- Buick Lucerne: 2006-2007 (with 4.6L V8 Engine, located in LH engine compartment)
- Buick Lucerne: 2008-2011 (All Engines, located in LH engine compartment)
This T42 TCM also interchanges with part numbers 24252114, 24234503, 24230461, 24234274, 24235340, and many others across a wide range of GM vehicles, confirming its OEM-level design and function.
Frequently Asked Questions
Do I need to take this part to a dealership for programming?
Absolutely not. We handle all the programming for you. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for immediate installation, saving you hundreds of dollars in dealer fees.
Where is the TCM located on my 2006-2011 Buick Lucerne?
You will find the Transmission Control Module in the engine bay, on the left-hand (driver’s) side.
Will this fix a P0700 transmission fault code?
Yes, a faulty TCM is one of the most common causes of a P0700 code. This code indicates a general fault has been requested by the TCM. Replacing a failing module with our programmed unit is a very effective way to resolve this issue.
Is there a core charge for my old part?
No, we do not require a core return. You can keep your old part or dispose of it without the hassle of shipping it back, making your repair process simpler.
What kind of warranty is included?
We stand behind our products with a comprehensive one-year warranty, giving you peace of mind with your purchase.