Is Your Buick Lucerne Experiencing Transmission Problems?
If your 2006-2011 Buick Lucerne is suffering from harsh shifting, delayed gear engagement, or has suddenly entered limp mode, 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 shift with precision. When it begins to fail, it can cause a cascade of frustrating and potentially damaging issues, from poor fuel economy to a complete inability to shift gears. Don’t let a faulty module sideline your vehicle. This direct-fit GM T42 TCM, service number 24234503, is the definitive solution to restore your transmission’s performance and reliability.
From the Diagnostic Bay
We recently had a 2008 Buick Lucerne come into the shop with classic symptoms of a bad shift solenoid. The driver reported erratic 2-3 shifts and a P0752 code (Shift Solenoid ‘A’ Stuck On). The owner had already replaced the solenoid with no change. Our diagnostics led us straight to the TCM. After installing one of our VIN-programmed modules, the shifting returned to its smooth, factory-new feel, and the trouble code was gone for good. It’s a common scenario where the module itself is the root cause, not the components it controls.
Signs Your Transmission Control Module is Failing
A failing TCM can manifest in several ways. If you’re experiencing any of the following symptoms, it’s time to consider a replacement. Ignoring these signs can lead to more severe transmission damage down the line.
- ✔ Erratic Shifting: Your Lucerne may shift harshly, slam into gear, or hesitate before shifting.
- ✔ Stuck in Gear: The vehicle may get stuck in a single gear (often 2nd or 3rd), a condition known as “limp mode,” to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes associated with a bad TCM include P0700, which indicates a general transmission fault, as well as specific solenoid codes like P0750, P0751, etc.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup caused by a faulty module can lead to a noticeable drop in MPG.
- ✔ No Communication: In some cases, a scan tool may be unable to communicate with the TCM, indicating a complete failure of the unit.
The Plug-and-Play Solution: Your 2006-2011 Lucerne TCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The biggest hurdle when replacing a modern electronic module is the need for expensive dealership programming. We eliminate that step entirely. By providing us with your vehicle’s VIN during checkout, we program the module with the latest GM software specific to your Buick Lucerne. This ensures that once installed, it communicates flawlessly with your vehicle’s Engine Control Module (ECM) and other systems, restoring optimal shift points, torque converter strategy, and overall transmission function right out of the box.
Built to strict OEM standards, this T42 module is a reliable replacement for a wide range of original part numbers, including 24252114, 24230461, 24234274, and more. It is engineered to provide lasting performance and comes with a one-year warranty for your peace of mind.
Frequently Asked Questions
What is VIN programming and why is it necessary?
VIN programming loads your vehicle’s specific software and calibration files onto the TCM. This is critical for ensuring the transmission shifts correctly based on your Lucerne’s engine, tire size, and other factory specifications. Our service means you can skip a costly trip to the dealership for programming.
Is this a difficult part to install myself?
For the Buick Lucerne, the TCM is located in the engine compartment on the driver’s side, making it relatively accessible. With basic hand tools, the installation typically takes under 30 minutes. Simply disconnect the battery, unplug the old module’s electrical connectors, unbolt it, and install the new one in its place.
Do I need to return my old TCM (core charge)?
No, there is no core charge for this part. You can keep your old module without any additional fees or hassle, simplifying the repair process for you.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause of a P0700, it’s essential to scan for other, more specific codes (like solenoid or sensor codes) to confirm the diagnosis. In many cases, replacing a faulty TCM will clear the P0700 and related codes.
Is this compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a wide array of 2006-2014 GM vehicles equipped with 4-speed automatic transmissions like the 4L60E and 4L65E. While this listing is for the Buick Lucerne, it also fits models like the Chevy Impala, GMC Sierra, Cadillac DTS, and more. Always verify the part number for your specific application.