Restore Peak Performance to Your Buick’s Transmission
Is your 2006-2011 Buick Lucerne suffering from erratic shifting, hesitation, or a frustrating check engine light? Before you consider a costly transmission overhaul, the problem may lie with its electronic brain: the Transmission Control Module (TCM). This critical component is responsible for managing every aspect of your automatic transmission’s behavior, from gear changes to torque converter lockup. When it fails, it can mimic the symptoms of a major mechanical breakdown, leaving you stranded in limp mode or dealing with harsh, unpredictable performance.
This genuine OEM-quality T42 Transmission Control Module, service number 24239926, is the definitive solution for restoring the smooth, reliable operation you expect from your vehicle. The most significant advantage of our module is that it arrives at your door fully pre-programmed to your vehicle’s specific VIN. This crucial step eliminates the need for expensive dealership programming, making the installation a straightforward, plug-and-play process for you or your mechanic.
From the Diagnostic Bay
We once had a 2008 Impala (which uses the same T42 module) towed in. The owner was quoted over $3,000 for a transmission rebuild at another shop due to harsh shifting and a P0752 (Shift Solenoid A Stuck On) code. Our technician, however, was suspicious. He checked the wiring and found it intact. On a hunch, he swapped in a known-good, programmed TCM. The shifting issues vanished instantly, and the code never returned. The original module had an internal failure causing the solenoid driver to malfunction. This saved the customer thousands and reinforced a key lesson: always suspect the electronics before condemning the hard parts.
Identifying a Failing Buick Lucerne Transmission Module
A failing TCM can manifest in various ways, often intermittently at first. If you’re experiencing any of the following issues, a faulty transmission module is a highly likely cause. This module is the correct fix for these common symptoms in your Buick Lucerne and a wide range of other GM vehicles.
- ✔ Harsh, slamming, or delayed gear engagement from a stop.
- ✔ Erratic or slipping shifts while driving.
- ✔ Vehicle stuck in a single gear (often called “limp mode”).
- ✔ The check engine light or transmission warning light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700, P0750, P0751, P0752, or other solenoid-specific faults.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ Inability to shift into higher or lower gears.
The Power of VIN Programming
Every vehicle’s transmission has unique characteristics and software requirements. Our VIN programming service ensures this module is loaded with the latest GM software updates specific to your Buick Lucerne. This guarantees perfect communication between the engine and transmission, optimizes shift points for both performance and fuel economy, and resolves software-related glitches that could cause persistent diagnostic codes. You simply install it, clear any old codes, and drive away.
Simple Installation, Lasting Reliability
Engineered to meet or exceed original equipment standards, this T42 TCM ensures long-lasting durability. For the 2006-2011 Buick Lucerne, the module is conveniently located in the LH (driver’s side) engine compartment, making for an accessible replacement that typically takes less than 30 minutes. This part is also a direct replacement for a vast array of other GM vehicles, including the Chevrolet Silverado, Tahoe, Impala; GMC Sierra, Yukon; Cadillac DTS, and many more equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is fully interchangeable with part numbers 24252114, 24234503, 24239926, and others listed in the fitment guide.
Frequently Asked Questions
What does a VIN-programmed TCM actually mean?
It means we load the module with the specific software and calibration files from General Motors that match your vehicle’s unique Vehicle Identification Number (VIN). This makes the module ready for installation right out of the box, without requiring any additional setup or expensive tools from a dealership.
Is this part difficult to install on my Buick Lucerne?
No, the installation is considered straightforward for a DIYer with basic tools. On the Lucerne, the TCM is located in the driver’s side of the engine compartment. The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. The entire job typically takes under 30 minutes.
Will this module fix a P0700 trouble code?
A P0700 code is a general code indicating that the TCM has detected a fault and has requested the check engine light to be turned on. While this module can fix the underlying issue that caused the P0700 (like a solenoid circuit fault), you should always have the specific transmission codes read with a proper scan tool to confirm the diagnosis.
Do I need to send my old module back? Is there a core charge?
No, there is no core charge for this part. You can keep your old module, which saves you the time, hassle, and expense of shipping it back.
How can I be sure the TCM is the problem and not the transmission itself?
While a definitive diagnosis requires a professional scan tool, TCM failure is extremely common and often presents as erratic electrical issues. If your transmission fluid is clean and at the correct level, and the shifting problems are inconsistent (sometimes fine, sometimes not), it points more strongly towards an electronic fault in the TCM rather than a mechanical failure inside the transmission.