Restore Your Buick’s Signature Smoothness
If your 2006-2011 Buick Lucerne is suffering from erratic shifting, delayed gear engagement, or has suddenly gone into ‘limp mode,’ the culprit is often a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the T42 TCM is responsible for every gear change. Over years of heat cycles and vibration, the internal components can degrade, leading to the frustrating and sometimes unsafe driving conditions you’re experiencing. I’ve seen this exact failure countless times in my shop; a customer comes in thinking they need a whole new transmission, but a simple TCM replacement gets them back on the road for a fraction of the cost.
This isn’t just a replacement part; it’s a permanent fix. We supply this high-quality T42 module, part number 24234503, pre-programmed to your vehicle’s specific VIN. This crucial step ensures that the module communicates flawlessly with your car’s engine computer and other systems right out of the box. You get to skip the expensive trip to the dealership for programming, saving you both time and money. By installing our VIN-programmed 2006-2011 Lucerne TCM, you are restoring the precise, reliable performance your car was designed to deliver.
A Technician’s Notebook: The Misleading Solenoid Code
A customer brought in a 2008 Buick Lucerne with a check engine light and a transmission that was banging into gear. The scan tool showed a DTC P0752 for a stuck-on shift solenoid. A less experienced tech might have immediately recommended dropping the transmission pan to replace the solenoid—a messy, time-consuming job. But from experience with these T42 modules, I knew better. The TCM is what sends the signal to that solenoid. We checked the wiring and found it was perfect. On a hunch, we swapped in a known-good programmed TCM. The harsh shifting vanished, and the code never returned. The original TCM was the real problem, not the solenoid. This module saved the customer hundreds in unnecessary labor and parts.
Is Your Lucerne Showing These Transmission Problems?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs attention. A new 2006-2011 Lucerne TCM is often the solution for these common issues.
- ✔ Harsh, jerky, or unpredictable gear shifts.
- ✔ The vehicle feels stuck in one gear (often 2nd or 3rd) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0752, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ The transmission seems to hesitate or delay when shifting from Park to Drive or Reverse.
A Straightforward Guide to TCM Installation
Replacing the TCM on your Buick Lucerne is a job most DIY enthusiasts can handle in their own garage in under 30 minutes. The module is conveniently located in the engine bay.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the Module: On the Lucerne, you’ll typically find the TCM in the left-hand (driver’s side) of the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harnesses from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely plug the wiring harnesses back into the correct ports. Double-check that they click into place.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic OBD2 scanner, use it to clear any stored fault codes. Take the car for a test drive to confirm that shifting is smooth and correct.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24234503 and is interchangeable with many other service numbers. It is guaranteed to fit the following models, including but not limited to:
- Buick Lucerne: 2006-2007 (4.6L), 2008-2011
- Buick Allure / LaCrosse: 2006-2009
- Cadillac DTS: 2006-2011
- Chevrolet Impala / Monte Carlo: 2006-2011
- Chevrolet Silverado / GMC Sierra Trucks: 2007-2013 (check location notes)
- Chevrolet Tahoe / GMC Yukon / Suburban: 2007-2009
- Pontiac Grand Prix / G6: 2006-2010
- …and many other GM vehicles from 2006-2014. Please verify your part number or consult the detailed fitment list.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This module comes fully pre-programmed to your vehicle’s VIN. Just provide your VIN at checkout, and we handle the rest. It arrives ready for plug-and-play installation, saving you hundreds in dealership fees.
Is there a core charge for my old part?
Absolutely not. We do not require you to send your old, faulty module back. You can keep it or dispose of it at your convenience, making the process hassle-free.
What tools are required for installation?
Basic hand tools are all you need. Typically, a simple socket set to remove the mounting bolts and a flathead screwdriver to help release the connector clips are sufficient for the entire job.
Will this fix a P0700 trouble code?
A P0700 code is a generic fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like an internal short triggering solenoid codes), you should always diagnose the specific codes the TCM has stored to confirm the failure point. In many cases, replacing a faulty TCM will clear the P0700 and related codes.
What is the warranty on this part?
This Transmission Control Module is backed by our comprehensive one-year warranty, giving you peace of mind and confidence in your repair.