Is Your Buick Lucerne Experiencing Transmission Problems?
If your 2006-2011 Buick Lucerne is suffering from harsh, erratic shifting, getting stuck in gear, or has an illuminated Check Engine Light, a failing Transmission Control Module (TCM) is the most likely culprit. 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 host of frustrating and potentially damaging issues. This genuine OEM-quality T42 TCM, service part number 24243901, is the definitive solution to restore your vehicle’s performance and drivability.
From the Diagnostic Bay
We recently had a 2008 Buick Lucerne come into the shop with a classic case of T42 TCM failure. The owner complained of intermittent, bone-jarring shifts from 1st to 2nd gear, but only after the car had been running for about 20 minutes. No codes were stored initially. After a long test drive, the transmission warning light finally came on with a solenoid performance code. Instead of chasing down individual solenoids inside the transmission—a costly and often incorrect repair—we identified the root cause: a faulty TCM that was failing under heat. Installing a VIN-programmed module like this one resolved all the issues in under an hour, saving the customer hundreds in unnecessary labor and parts.
Symptoms of a Failing 2006-2011 Lucerne TCM
A failing TCM can manifest in various ways. If you’re experiencing any of the following symptoms, it’s a strong indicator that your module needs replacement. Ignoring these signs can lead to more severe transmission damage over time.
- ✔️ Harsh or delayed gear engagement from Park to Drive or Reverse.
- ✔️ Abrupt, jerky, or unpredictable shifting between gears while driving.
- ✔️ The vehicle entering “limp mode,” where it gets stuck in a single gear (usually 2nd or 3rd) to prevent further damage.
- ✔️ The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔️ Diagnostic Trouble Codes (DTCs) are stored, such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (e.g., P0750, P0751).
- ✔️ A noticeable decrease in fuel economy due to inefficient shifting patterns.
- ✔️ The transmission seems to slip, where engine RPMs increase without a corresponding increase in vehicle speed.
The Plug-and-Play Solution: VIN Programming Included
What sets this module apart is our expert VIN programming service. Modern vehicles require electronic modules to be specifically coded to their unique Vehicle Identification Number (VIN). Without this programming, the part simply will not work. This T42 TCM will arrive at your door pre-programmed with the latest GM software updates for your specific Lucerne. This means:
- No Dealership Required: You can skip the expensive trip to the dealer for programming. This module is ready for installation right out of the box.
- Guaranteed Compatibility: By programming the module to your VIN, we ensure it communicates perfectly with your vehicle’s engine computer and other systems.
- Optimal Performance: The latest software updates from GM are loaded, which often resolve factory bugs and improve transmission behavior beyond the original specifications.
Simple, Straightforward Installation
Replacing the TCM on a 2006-2011 Buick Lucerne is a job that can be completed by a competent DIY mechanic in under 30 minutes. The module is conveniently located in the engine compartment on the left-hand (driver’s) side. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect the connectors and the battery terminal, and you’re ready to go. We recommend using a basic scan tool to clear any old DTCs after installation. Best of all, there is no core charge, so you don’t have to worry about the hassle of sending your old part back.
This module is also a direct replacement for a wide range of other GM vehicles utilizing the 4-speed automatic transmissions (like the 4L60E, 4L65E, and 4L70E), making it a versatile and reliable part. It interchanges with numerous part numbers, including 24252114, 24234503, 24230461, and 24243901.
Frequently Asked Questions
What does a Transmission Control Module do on a Buick Lucerne?
The TCM acts as the central computer for your automatic transmission. It receives data from various sensors (like vehicle speed, engine RPM, and throttle position) to determine the perfect moment to shift gears, control hydraulic pressure, and engage the torque converter clutch. A healthy TCM ensures smooth shifting, optimal performance, and good fuel economy.
Is this TCM difficult to install on my 2006-2011 Lucerne?
No, the installation is very straightforward. The module is located in the LH engine compartment. The process involves disconnecting the battery, unplugging two electrical connectors, removing a few mounting bolts, and then reversing the process with the new module. Most people with basic tools can complete the job in under 30 minutes.
Why is VIN programming so important for this part?
VIN programming syncs the new TCM with your car’s specific systems, including the engine control unit (ECU) and anti-theft system. Without it, the car won’t recognize the new module, and the transmission will not function correctly, if at all. Our pre-programming service makes the part truly plug-and-play, saving you a trip to the dealership.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault code indicating that the TCM has detected a problem and has requested the Check Engine Light to be turned on. While P0700 itself doesn’t pinpoint the TCM as the failure, it is very commonly seen alongside other codes that do. Replacing a faulty TCM will resolve the underlying issue, which in turn will clear the P0700 code once all codes are cleared from the system.
Do I need to send my old TCM back? Is there a core charge?
No, there is absolutely no core charge for this part. You can keep your old module or dispose of it as you see fit, eliminating the hassle and extra cost associated with core returns.