If your 2006-2011 Buick Lucerne is suffering from jerky shifting, getting stuck in gear, or has an illuminated Check Engine Light, a failing Transmission Control Module (TCM) is the most likely culprit. As a mechanic with over two decades of diagnostic experience, I’ve seen firsthand how a faulty TCM can make a perfectly good car feel unreliable. This T42 Transmission Control Module, part number 24235753, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, communication between the engine and transmission breaks down, leading to the frustrating and sometimes dangerous symptoms you’re experiencing. Our module restores that critical communication, ensuring your Lucerne’s transmission operates with the smoothness and precision you expect. Forget about expensive dealership visits for programming—this unit is ready to install right out of the box, saving you time and money.
A Technician’s Notebook: The Intermittent Lucerne
A customer brought in an ’08 Lucerne with a complaint that stumped two other shops: intermittent, violent downshifts when coming to a stop, but no consistent trouble codes. After a long test drive, I finally caught a pending P0752 (Shift Solenoid ‘A’ Stuck On). The solenoid itself tested fine, which pointed me higher up the chain. In my experience with these GM platforms, intermittent electrical commands are a classic sign of a failing TCM. The internal circuit board develops micro-fractures from heat cycles, causing unpredictable behavior. We installed a VIN-programmed T42 module, and the problem was solved instantly. The customer was thrilled to have their smooth, predictable luxury car back.
Is Your Buick Exhibiting These Transmission Woes?
- ✔ Harsh, erratic, or delayed gear shifts that disrupt your drive.
- ✔ The vehicle is stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0752, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift, leading to poor acceleration and performance.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
- ✔ Inability to engage Drive or Reverse, or a long delay before engagement.
DIY-Friendly Installation: A 30-Minute Fix
You don’t need to be a professional mechanic to replace this module. The process is straightforward and can be completed in your driveway in under 30 minutes. For the Buick Lucerne, you’ll find it in the left-hand (driver’s side) of the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: Find the TCM in the LH engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New TCM: Mount your new, pre-programmed module in the same location, secure the bolts, and firmly reconnect the wiring harnesses until they click.
- Final Steps: Reconnect the battery terminal. While our programming handles the heavy lifting, it’s best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your General Motors Vehicle
While this is the perfect solution for your 2006-2011 Lucerne, this T42 TCM is also compatible with a wide range of GM cars, trucks, and SUVs. It is a direct replacement for multiple part numbers, including 24252114, 24234503, 24235753, and more. Please verify your vehicle in the fitment list below.
Fitment Includes: Buick Lucerne (2006-2011), Chevrolet Silverado, Tahoe, Impala, Cobalt; GMC Sierra, Yukon; Cadillac DTS; Pontiac G6; and many others. Check the detailed list for your specific model and year.
Frequently Asked Questions
What exactly does “VIN Programmed” mean for me?
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your car’s engine computer and other systems, eliminating the need for a trip to the dealer for expensive programming.
Do I need any special tools for this installation?
No special tools are required. Basic hand tools like a socket set to remove the mounting bolts and disconnect the battery are all you need. An OBD2 scanner is recommended to clear old codes, but is not always necessary.
Is there a core charge or do I need to send my old part back?
No, there is absolutely no core charge. You can keep your old part, so there’s no hassle with return shipping or waiting for a refund.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the Check Engine Light. Often, a faulty TCM is the root cause that triggers this code along with more specific transmission codes. Replacing the TCM is a very common and effective fix for a P0700 when other transmission symptoms are present.
What if I have issues after installation?
Our modules come with a one-year warranty and are backed by our expert support. If you run into any issues, please contact us. In most cases, problems are resolved by ensuring the connectors are fully seated or by clearing old, persistent trouble codes with a scan tool.