Experiencing Erratic Shifting in Your Buick Lucerne?
If your 2006-2011 Buick Lucerne is suffering from harsh gear changes, delayed engagement, or is stuck in limp mode, you’re not just dealing with an annoyanceโyou’re facing a critical component failure. These are classic signs that the Transmission Control Module (TCM), the electronic brain of your automatic transmission, is failing. Ignoring these symptoms can lead to poor fuel economy, excessive transmission wear, and eventually, a complete breakdown. This is a problem I’ve diagnosed hundreds of times in my shop, and the solution is often simpler than you think.
The Definitive Fix for Common GM Transmission Problems
This T42 Transmission Control Module is the direct-fit, reliable solution for your vehicle. It’s not just a replacement part; it’s a complete fix that arrives pre-programmed to your Lucerne’s specific Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership for programming. We handle the complex part, so you can get back on the road fast with confidence.
A Real-World Scenario from My Shop
“Just last month, a 2008 Lucerne with the 4.6L V8 was towed in. The owner was frustratedโthe car would barely move, stuck in what felt like third gear, and the check engine light was glaring. A quick scan showed a P0700 (Transmission Control System Malfunction) code. Instead of a costly transmission rebuild, we started with the most common culprit: the TCM. After installing one of our VIN-programmed modulesโa 20-minute jobโthe car shifted as smoothly as it did the day it left the factory. The customer saved thousands and drove away with a permanent fix.”
Is Your Buick Lucerne Showing These Symptoms?
- โ๏ธ Harsh, slamming shifts or erratic gear hunting.
- โ๏ธ Vehicle is stuck in one gear (limp mode) and won’t shift up or down.
- โ๏ธ Check Engine Light or Transmission Warning Light is on.
- โ๏ธ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- โ๏ธ A sudden drop in fuel efficiency or signs of the transmission overheating.
- โ๏ธ Complete loss of communication with the transmission module.
Plug-and-Play Installation: No Dealer Visit Required
This 2006-2011 Lucerne TCM is designed for a straightforward installation. For the Buick Lucerne, you’ll find it located in the left-hand (driver’s side) engine compartment. The entire process typically takes less than 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: Find the old TCM in the LH engine compartment. It will have several electrical connectors attached.
- Swap the Part: Carefully unplug the wiring harnesses and unbolt the old module. Mount the new module in its place and securely reconnect the harnesses.
- Final Steps: Reconnect the battery terminal. While our programming resolves most codes, it’s good practice to use a basic OBD2 scanner to clear any stored DTCs after installation.
Frequently Asked Questions
Q: What does VIN programming do for me?
A: VIN programming ensures the module has the correct software and calibrations specifically for your Lucerne’s engine, transmission, and options. This makes it a true plug-and-play part, eliminating the need for dealer-level tools and extra costs.
Q: Is this part compatible with other GM vehicles?
A: Yes, this T42 TCM is compatible with a wide range of GM vehicles using 4-speed automatic transmissions like the 4L60E and 4L65E, including models like the Impala, Tahoe, and Silverado. Always verify the part number for your specific application.
Q: Do I need to send my old part back?
A: No, there is no core charge for this module. You can keep or dispose of your old part without any hassle or extra fees.
Q: What if I still have issues after installation?
A: Our modules are backed by a one-year warranty and expert support. While this part resolves the vast majority of electronic transmission faults, we’re here to help diagnose any other potential issues.
Guaranteed Compatibility & Interchange Information
This module directly replaces OEM part number 24235754 and is interchangeable with a variety of other service numbers, including: 24252114, 24234503, 24230461, 24234274, 24235340, 24238856, 24239224, 24240400, and more. Restore your vehicle’s performance and reliability today.