Restore Your Buick’s Shifting Performance
Is your 2006-2011 Buick Lucerne suffering from harsh shifting, delayed gear engagement, or getting stuck in ‘limp mode’? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and monitoring system health. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage if left unaddressed.
This genuine OEM-quality T42 Transmission Control Module, service number 24255280, is the definitive solution to these frustrating issues. Unlike generic modules that require expensive and time-consuming trips to the dealership for programming, our TCM arrives at your door pre-programmed to your vehicle’s specific VIN. This ensures a seamless, plug-and-play installation that restores the precise, smooth shifting you expect from your vehicle right out of the box.
From the Diagnostic Bay
We had a 2008 Chevy Tahoe come into the shop with the check engine light on and the transmission stuck in 3rd gear. The customer was worried about a costly transmission rebuild. We pulled the codes and saw a P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. Instead of just throwing parts at it, we checked the TCM’s power and ground, which were fine. Experience told us the internal logic of the T42 module had failed. We ordered a VIN-programmed module, installed it in under 20 minutes right next to the battery, cleared the codes, and the Tahoe was shifting perfectly on the test drive. The customer was thrilled to avoid a multi-thousand dollar repair bill with a simple, effective component replacement.
Symptoms of a Failing 2006-2011 Lucerne TCM
- ✔ Erratic and Harsh Shifting: Your vehicle may slam into gear, hesitate, or shift at the wrong times.
- ✔ Stuck in Limp Mode: The transmission may default to a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700, P0750, P0753, P0758, and other solenoid-related faults.
- ✔ No Upshift or Downshift: The transmission may refuse to shift into higher or lower gears as needed.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter operation can lead to a noticeable drop in MPG.
- ✔ Complete Communication Loss: In severe cases, the TCM may stop communicating with the Engine Control Module (ECM) and other vehicle systems entirely.
The Plug-and-Play Advantage: Pre-Programmed for Your Vehicle
The single biggest hurdle when replacing a modern electronic module is programming. This T42 TCM eliminates that problem. During checkout, you provide your vehicle’s VIN, and we flash the module with the latest GM-certified software specific to your car. This process ensures that the module communicates flawlessly with your vehicle’s existing systems, recognizes the correct transmission type (4L60E, 4L65E, 4L70E), and operates with the precise shift points and pressure settings intended by the manufacturer. This is not a one-size-fits-all solution; it’s a tailored repair that guarantees optimal performance and longevity.
Installation is Simpler Than You Think
Designed for a straightforward installation, this module can be replaced with basic hand tools in under 30 minutes. The location varies by model but is typically easy to access in the engine bay—often on the LH strut tower, next to the battery, or under the air cleaner box. 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 everything, and you’re ready to go. No core charge means you can keep your old part without the hassle of shipping it back.
Frequently Asked Questions
What does a Transmission Control Module do?
The TCM acts as the central computer for your automatic transmission. It processes data from various sensors (like vehicle speed, engine RPM, and throttle position) to determine the perfect moment to shift gears, control fluid pressure, and engage the torque converter clutch for maximum efficiency and smoothness.
Why is VIN programming so important for this part?
VIN programming loads your vehicle’s specific software and calibration files onto the module. Without it, the TCM won’t know the correct gear ratios, tire size, or shift strategies for your exact model, leading to poor performance, error codes, and potential transmission damage. Our pre-programming saves you a mandatory trip to the dealership.
Will this module fit vehicles other than the Buick Lucerne?
Yes. The T42 TCM was used across a wide range of General Motors vehicles from roughly 2006 to 2014, including popular trucks and SUVs like the Chevy Silverado, Tahoe, GMC Sierra, and Yukon, as well as cars like the Impala, Malibu, and Cadillac DTS. Please verify your part number or use our vehicle fitment tool to ensure compatibility.
Is this an easy part to install myself?
For most DIY mechanics, this is a very manageable job. It typically involves disconnecting the battery, unplugging a few electrical connectors, and removing a few bolts. The module is usually located in an accessible spot in the engine bay. No special tools are required.
Will this fix my P0700 check engine light code?
A P0700 code is a general fault code indicating the TCM has detected a problem and has requested the check engine light be turned on. If the root cause is a faulty TCM, replacing it with this programmed unit will resolve the issue and allow the code to be cleared. It often resolves related solenoid codes as well.
Is there a core charge for this part?
No, there is no core charge. You are not required to return your old, faulty module, which simplifies the repair process for you.