Is Your Buick Lucerne Shifting Erratically?
If your 2006-2011 Buick Lucerne is suffering from harsh shifts, delayed gear engagement, or has the dreaded check engine light illuminated with transmission codes, you’re likely dealing with a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it begins to fail, it can cause a cascade of frustrating and potentially damaging issues, from poor fuel economy to being stuck in ‘limp mode’. Don’t let a faulty module sideline your vehicle. This direct-fit T42 TCM is the definitive solution to restore your transmission’s performance and reliability.
From the Diagnostic Bay
We recently had a 2008 Lucerne come into the shop with classic symptoms: banging into gear and a P0700 code. The owner had already spent a small fortune replacing shift solenoids based on a generic code reader’s suggestion, but the problem persisted. After a quick diagnostic, we identified the root cause: the original TCM was failing intermittently, sending erratic signals to the very solenoids he had just replaced. We installed one of our VIN-programmed T42 modules, cleared the codes, and the car shifted like it just rolled off the factory floor. It’s a common story—save yourself the time and money by addressing the actual problem first with a reliable, pre-programmed TCM.
The Ultimate Solution: A VIN-Programmed 2006-2011 Lucerne TCM
This isn’t just any replacement part. Each module is meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures seamless communication between the TCM and your Lucerne’s other electronic systems, like the Engine Control Module (ECM). By loading the latest GM software updates, this process corrects common factory flaws and optimizes shift points and hydraulic pressure for your specific vehicle configuration. The result is a true plug-and-play installation that requires no expensive trips to the dealership for additional programming.
Symptoms of a Failing Buick Lucerne TCM
- ✔️ Harsh or slamming gear changes, especially from 1st to 2nd gear.
- ✔️ The vehicle gets stuck in a single gear (limp mode) to prevent further damage.
- ✔️ Check Engine Light or Transmission Warning Light is on.
- ✔️ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are stored.
- ✔️ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔️ Inconsistent or no upshifting or downshifting.
- ✔️ A noticeable decrease in fuel efficiency.
- ✔️ Complete loss of communication with the transmission module.
Installation and Compatibility
Replacing the TCM on a 2006-2011 Buick Lucerne is a straightforward job for a DIY mechanic. The module is typically located in the engine compartment, on the driver’s side (LH engine compartment), making it easily accessible. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Once the new module is connected and the battery is reconnected, the vehicle is ready to go. We recommend using a scan tool to clear any old codes from the system’s memory after installation.
This T42 TCM, part number 24234274, is also a direct replacement for a wide range of other GM vehicles and interchanges with numerous part numbers, including: 24252114, 24234503, 24230461, 24235340, 24235754, 24238856, 24239224, 24240400, 24256960, and YNXS. It is designed to work with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E found in many popular models.
Frequently Asked Questions
What does ‘VIN-Programmed’ actually mean?
VIN programming means we load your vehicle’s unique 17-digit Vehicle Identification Number into the module before shipping. This process installs the exact software and calibration files from GM that your car was designed to use, ensuring perfect compatibility with its engine, tire size, and other systems. It eliminates the need for a dealership visit for programming.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a very manageable job. The TCM on the Buick Lucerne is located in the engine bay and is typically held on with a few bolts. The main steps are disconnecting the battery, unplugging the old module, and swapping in the new one. The entire process often takes less than 30 minutes.
Will this fix my specific transmission error code?
This module is a common solution for a range of transmission codes, especially the general fault code P0700, and various solenoid performance codes (e.g., P0751, P0756). If your diagnostics point to an electrical or module failure rather than a mechanical one, this part is very likely the correct fix.
Do I need to send my old module back?
No, there is no core charge for this part. You can keep your old module, recycle it, or dispose of it as you see fit, offering a hassle-free purchasing experience.
What happens if I install a TCM that isn’t programmed to my VIN?
An unprogrammed or incorrectly programmed TCM can cause a host of problems. It may not communicate properly with the vehicle’s network, leading to incorrect shifting, poor performance, inaccurate speedometer readings, and persistent check engine lights. In many cases, the vehicle may not even start. Our VIN programming service prevents all of these issues.