Restore Peak Transmission Performance to Your Buick Lucerne
Is your 2006-2011 Buick Lucerne suffering from harsh shifting, delayed gear engagement, or an illuminated check engine light? 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, drivability suffers, and you may even get stuck in limp mode. This replacement GM T42 Transmission Control Module, part number 24243921, is the definitive solution to restore your vehicle’s smooth operation and reliability. If you’re experiencing these frustrating issues, a faulty 2006-2011 Lucerne TCM is the most likely culprit.
From the Diagnostic Bay
We had a 2008 Buick Lucerne come into the shop with a P0700 code and what the owner described as ‘violent’ shifting from 1st to 2nd gear. Another shop had quoted him for a full transmission rebuild, costing thousands. We hooked up our professional scan tool and saw erratic data from the shift solenoids. Instead of jumping to conclusions, we checked the TCM connectors for corrosion—they were clean. We knew the T42 modules were a common point of failure. We installed one of our VIN-programmed modules, cleared the codes, and the car shifted like it just rolled off the factory floor. The customer saved a fortune by correctly diagnosing the electronic component first.
Diagnosing Your 2006-2011 Lucerne TCM Failure
A failing TCM can mimic the symptoms of severe internal transmission damage, making accurate diagnosis crucial. Before condemning your transmission, look for these specific electronic failure indicators. This module is designed to directly address these problems, providing a lasting repair without the need for a costly trip to the dealership for programming.
Common Symptoms of a Faulty T42 Module
- âś” Hard, erratic, or delayed gear shifts that disrupt your drive.
- âś” Vehicle is stuck in a single gear (limp mode), usually 2nd or 3rd, with limited power.
- âś” Check Engine Light or Transmission Warning Light is on.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (e.g., P0751, P0756).
- âś” Inability to upshift or downshift correctly, leading to poor acceleration and fuel economy.
- âś” Intermittent loss of communication with the TCM, causing unpredictable behavior.
The Plug-and-Play Advantage
What sets this module apart is our professional VIN programming service. When you order, we flash the unit with your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software updates. This ensures the TCM is perfectly matched to your Lucerne’s factory settings. It arrives at your door ready for a simple, plug-and-play installation. There is no need for expensive scan tools or dealership appointments. Just swap the part, and you’re ready to go. This process resolves common software-related DTCs and guarantees optimal performance from the moment of installation.
This module is a direct replacement for a wide range of GM vehicles using the T42 controller and 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24230461, and more, making it a versatile solution for many models beyond the Lucerne.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This Transmission Control Module comes pre-programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, saving you time and the expense of a dealership visit.
Where is the TCM located on my 2006-2011 Buick Lucerne?
On the Buick Lucerne for these model years, the TCM is typically found in the engine compartment on the driver’s side (LH side). Always confirm the location for your specific vehicle before beginning the installation.
Is this a difficult part to install?
Installation is straightforward for someone with basic mechanical skills. It usually involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then reversing the process with the new one. The entire job can often be completed in under 30 minutes.
What if my part number is slightly different?
This T42 module is interchangeable with a long list of GM service numbers, including 24252114, 24234503, 24243901, and many others listed in the description. As long as your vehicle is on the compatibility list, this programmed module will function correctly as a replacement.
Is there a core charge for my old part?
No, there is no core charge required for this part. You can keep your old module without the hassle of returning it, making the replacement process even simpler.