Restore Your Buick’s Signature Smoothness
If you’re experiencing jarring shifts, delayed gear engagement, or a frustrating check engine light in your 2006-2011 Buick Lucerne, the problem often points directly to a failing Transmission Control Module (TCM). As a technician with over two decades of experience under the hood, I’ve seen countless GM vehicles, including luxury sedans like the Lucerne, get sidelined by these exact issues. A faulty TCM doesn’t just make for an unpleasant drive; it can cause poor fuel economy and lead to more significant transmission damage if ignored. This is not a problem you want to put off.
This T42 Transmission Control Module is the definitive, reliable solution. It arrives at your door fully pre-programmed to your vehicle’s specific VIN. This is the critical advantage: you completely bypass the time, expense, and hassle of a dealership appointment for programming. It’s a true plug-and-play fix designed to get your car operating as it should, restoring the quiet, seamless shifting you expect from a Buick.
From the Diagnostic Bay
I remember a 2008 Lucerne that came into the shop with a classic complaint: “It shifts fine when it’s cold, but after 20 minutes of driving, it bangs into gear.” The customer was worried about a full transmission rebuild. We pulled the codes and saw a P0750 for a shift solenoid circuit, but the solenoid itself tested fine. Experience told us to look at the TCM. Heat soak was causing an internal failure in the module, leading to the intermittent command issue. Instead of a multi-thousand-dollar transmission job, we installed a VIN-programmed 2006-2011 Lucerne TCM. The car was back on the road in under an hour, shifting perfectly. The customer was relieved, and we had another successful, efficient repair.
Is Your Buick Lucerne Showing These Transmission Problems?
- ✔ Harsh, slamming, or erratic gear changes.
- ✔ The vehicle is stuck in “limp mode” and won’t shift out of 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700 (Transmission Control System Malfunction) or other solenoid-related codes.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Complete loss of communication with the TCM.
A Straightforward Guide to Installation
For the confident DIYer or professional mechanic, replacing the 2006-2011 Lucerne TCM is a simple job that requires only basic hand tools and about 30 minutes of your time. On the Lucerne, it’s conveniently located in the engine compartment for easy access.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the Module: On the 2006-2011 Lucerne, the TCM is typically found in the left-hand (driver’s side) of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New TCM: Mount the new, pre-programmed TCM onto the bracket and securely plug in the electrical connectors.
- Final Steps: Reconnect the battery terminal. While our programming resolves most issues, it’s good practice to use a scan tool to clear any lingering fault codes from the vehicle’s memory.
Verified Fitment for Your General Motors Vehicle
This module, part number 24240400, is a direct replacement for a wide range of GM cars, trucks, and SUVs. While this page focuses on the 2006-2011 Lucerne TCM, it is also compatible with the following models. Please verify your specific model and options.
- Buick: Lucerne (2006-2011), LaCrosse (2006-2009), Allure (2006-2009), Rainier (2006-07), Rendezvous (2006-07)
- Chevrolet: Silverado, Tahoe, Suburban, Avalanche (2007-2013), Impala (2006-2011), Monte Carlo (2006-07), Cobalt (2006-10), HHR (2006-11), Colorado (2008-12), Express Van (2006-14)
- GMC: Sierra, Yukon, Savana Van (2006-2014), Envoy (2006-09), Canyon (2008-12)
- Cadillac: DTS (2006-2011)
- Pontiac: G6 (2006-10), Grand Prix (2006-08), G5 (2007-10), Pursuit (2006)
- Saturn: Vue (2007-10), Aura (2007-09), Ion (2006-07)
- Hummer: H3 (2008-2010)
- Saab: 9-7X (2006-2009)
Do I need to program this module?
Do I need to program this module?
No. This is the biggest benefit of our service. The module arrives fully programmed to your car’s VIN. It is ready for immediate installation right out of the box, with no need for a trip to the dealership.
Where is the TCM located on my Buick Lucerne?
For the 2006-2011 Buick Lucerne, the Transmission Control Module is located in the engine bay, on the left-hand (driver’s) side.
Will this fix a P0700 trouble code?
A P0700 code indicates a general fault within the transmission control system. A failing TCM is a very common cause of this code. Replacing the module with our programmed unit is a highly effective solution for resolving P0700 and related transmission codes.
Do I have to send my old part back?
No, there is no core charge for this part. You can keep or dispose of your old module without any hassle or extra fees.