If your 2006-2011 Buick Lucerne is suffering from erratic shifting, getting stuck in gear, or has a persistent check engine light, you’re likely dealing with a failing Transmission Control Module (TCM). As a technician with over 20 years of experience, I’ve seen countless GM vehicles sidelined by these exact issues. The TCM is the brain of your automatic transmission, and when it fails, it can make your car feel unreliable and unsafe. This T42 TCM, part number 24240449, is the definitive solution, arriving pre-programmed to your car’s VIN for a true plug-and-play repair.
Case Study: The “Phantom” Shifting Problem
A customer brought in a 2008 Buick Lucerne with a complaint that stumped two other shops. The car would occasionally slam into gear on the 1-2 shift, but only when warm. Other times, it would delay shifting out of 3rd. There were no consistent solenoid codes, just a general P0700 (Transmission Control System Malfunction). After checking wiring and fluid, we focused on the TCM. These modules can develop internal micro-fractures from heat cycles, causing intermittent failures that don’t always throw a specific code. We installed a VIN-programmed TCM, and the problem was solved instantly. The customer was relieved to have their smooth, predictable luxury ride back without a costly transmission rebuild.
Is Your Buick Lucerne Showing These Transmission Issues?
- ✔️ Harsh, banging, or delayed gear shifts.
- ✔️ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear) to protect the transmission.
- ✔️ Check Engine Light is on with codes like P0700, P0750, or other transmission-related DTCs.
- ✔️ Poor acceleration and decreased fuel economy.
- ✔️ The transmission seems to slip between gears or fails to engage from Park.
- ✔️ Complete loss of communication with the transmission module.
The Permanent Fix for Your 2006-2011 Lucerne TCM
Don’t let a faulty module dictate your driving experience. This replacement TCM is engineered to meet or exceed original GM specifications. The most critical benefit is our in-house VIN programming. When you order, we flash the module with the latest GM software specific to your vehicle. This eliminates the need for an expensive trip to the dealership for programming, saving you time and money. It’s built for reliability, ensuring precise control over shift points and torque converter lockup, which restores performance and protects your transmission from further wear.
Your Straightforward 30-Minute Installation Guide
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- ✔ Locate the Module: On the Buick Lucerne, the TCM is typically found in the engine compartment, mounted on the left-hand (driver’s) side. It’s often near the strut tower or under the air cleaner housing.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the bolts or nuts holding the old module in place.
- ✔ Install the New TCM: Mount your new, pre-programmed module in the same location and secure it with the original hardware. Reconnect the electrical connectors firmly until they click.
- ✔ Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Start the car and enjoy smooth shifting!
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24240449 and other interchangeable numbers. While this page is focused on the 2006-2011 Lucerne TCM, this module also fits a wide range of GM cars, trucks, and SUVs. Please see the comprehensive list below to confirm compatibility with your specific vehicle.
This part will fit these makes and models with these options
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
LUCERNE 08-11 Transmission; (LH engine compartment)
ALLURE 06-09 Transmission; (lower air cleaner housing)
AVALANCHE 1500 07-08 Transmission; (next to battery)
CANYON 08-12 Transmission; (RH rear engine compartment)
COBALT 06-10 Transmission; (LH strut tower)
COLORADO 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-09 Transmission; (LH engine compartment)
EXPRESS VANS 06-14 Transmission; (RH engine compartment)
G5 07-10 Transmission; (LH strut tower)
G6 06-10 Transmission; (LH strut tower)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HHR 06-11 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
MALIBU 06-10 Transmission; (LH frame rail)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
SAVANA VANS 06-14 Transmission; (RH engine compartment)
SIERRA PICKUPS 07-13 Transmission; (next to battery)
SILVERADO PICKUPS 07-13 Transmission; (next to battery)
TAHOE 07-09 Transmission; (next to battery)
TRAILBLAZER 06-09 Transmission; (LH engine compartment)
YUKON 07-09 Transmission; (next to battery)
And more…