Restore Flawless Shifting to Your Buick Lucerne
Is your 2006-2011 Buick Lucerne suffering from harsh shifting, getting stuck in gear, or throwing transmission codes? Don’t let a faulty Transmission Control Module (TCM) ruin your driving experience. As a technician with over two decades of experience, I’ve seen firsthand how a failing TCM can mimic more severe transmission problems, leading to costly and unnecessary repairs. This T42 TCM, part number 24243921, is the reliable, cost-effective solution to restore your vehicle’s performance and peace of mind.
This isn’t just a replacement part; it’s a complete fix. We pre-program each module to your vehicle’s specific VIN, ensuring it arrives ready for a true plug-and-play installation. This step eliminates the need for expensive dealership visits for programming, saving you time and money. It’s designed to be the definitive solution for the common issues that plague these GM transmissions, getting you back on the road quickly and confidently.
From the Diagnostic Bay
I remember a 2008 Lucerne that came into the shop stuck in ‘limp mode’ (3rd gear only) with a P0752 (Shift Solenoid ‘A’ Stuck On) code. The owner had already replaced the solenoid with no change. After a quick check of the wiring, we suspected the TCM. The internal drivers that control the solenoids are a common failure point. We installed one of our VIN-programmed T42 modules, cleared the codes, and the car shifted perfectly. It’s a classic case where the root cause was the controller, not the component it was flagging.
Is Your Buick Exhibiting These Transmission Faults?
A failing TCM can cause a host of frustrating symptoms. If you’re experiencing any of the following, this module is the likely solution for your 2006-2011 Lucerne TCM issues:
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle is stuck in a single gear (limp mode).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Poor fuel economy and a feeling of lost power.
- ✔ Failure to upshift or downshift correctly.
Your Step-by-Step Installation Guide
Installing your new TCM is a straightforward job that most DIYers can handle in under 30 minutes with basic tools. For the Buick Lucerne, the TCM is typically located in the left-hand (driver’s side) engine compartment.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and to help reset the system.
- Locate the Old Module: Find the TCM in the LH engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new VIN-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring the clips click into place.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and check for any warning lights. While not always necessary, using a basic scan tool to clear any stored historical codes is good practice.
Verified Vehicle Compatibility
This T42 TCM (part 24243921) is a direct replacement for a wide range of General Motors vehicles. While this page focuses on the 2006-2011 Lucerne TCM, it is also compatible with the following models. Please verify your specific model and location notes.
- Buick Lucerne: 2006-2011 (LH engine compartment)
- Buick Allure / LaCrosse: 2006-2009 (lower air cleaner housing)
- Cadillac DTS: 2006-2011 (RH front engine compartment)
- Chevrolet Cobalt / HHR / Impala / Monte Carlo: Various years, check fitment list.
- Chevrolet Silverado / Tahoe / Suburban: Various years, typically next to the battery.
- GMC Sierra / Yukon / Savana: Various years, check fitment list.
- Pontiac G5 / G6 / Grand Prix: Various years, typically on the LH strut tower.
- …and many more GM, Saturn, Saab, and Hummer models. This module interchanges with part numbers including 24252114, 24234503, 24243901, and more.
Does this TCM require programming at a dealership?
Does this TCM require programming at a dealership?
No, it does not. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for a plug-and-play installation, saving you the time and expense of a dealer visit.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part without any hassle or need to ship it back to us.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the main engine computer (ECM). While this module often resolves the underlying issue causing the P0700 (like a solenoid circuit fault), it’s important to diagnose any other specific codes that are present alongside it.
How difficult is the installation?
For a Buick Lucerne, the installation is very straightforward. It typically takes less than 30 minutes with basic hand tools, as the module is easily accessible in the engine bay.