Restore Your Buick’s Performance with a Reliable Transmission Brain
If your 2006-2011 Buick Lucerne is suffering from harsh shifting, getting stuck in gear, or throwing transmission-related codes, the culprit is often a failing Transmission Control Module (TCM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfectly good vehicle. This T42 series module, part number 24230461, is the definitive solution, arriving at your door pre-programmed to your vehicle’s specific VIN. This eliminates the need for expensive dealership visits and gets you back on the road with confidence.
The TCM is the electronic brain of your automatic transmission. It processes data from various sensors to command precise gear changes and manage torque converter lockup for optimal fuel efficiency. When it fails, the communication breaks down, leading to the frustrating and potentially unsafe driving conditions you’re likely experiencing. This replacement module restores that critical link, ensuring your transmission operates as the factory intended.
From the Diagnostic Bay: The Case of the Hesitant Lucerne
A customer brought in an ’08 Lucerne with an intermittent but maddening problem. It would drive fine for days, then suddenly refuse to shift out of 3rd gear (limp mode), with a P0700 code on the scanner. We checked the fluid, wiring, and solenoids—all were fine. The intermittent nature pointed directly to an electronic failure. In my experience, heat cycles and vibration cause microscopic cracks in the TCM’s circuit board. We installed a VIN-programmed 2006-2011 Lucerne TCM, and the problem vanished instantly. The customer saved a potential fortune by avoiding an unnecessary transmission replacement.
Is Your Buick Exhibiting These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Watch for these early warning signs. Addressing them with a new module can prevent further damage to your transmission’s mechanical components.
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ A sudden and unexplained drop in fuel economy.
- ✔ The transmission seems to slip between gears or fails to engage from Park.
A Straightforward Guide to Installation
One of the best features of this module is its simple, DIY-friendly installation. Since we program it to your VIN before shipping, you won’t need any special programming tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On the Buick Lucerne, the TCM is typically found in the engine compartment on the driver’s side (LH side), often near the air cleaner housing or strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to release the locking tabs if necessary. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new module securely onto the bracket and plug in the electrical connectors until they click firmly into place.
- Reconnect Power: Reattach the negative battery terminal and tighten it securely.
- Final Steps: Start the vehicle. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any stored transmission codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24230461 and other interchangeable numbers. While it is a perfect fit for the 2006-2011 Lucerne TCM requirement, it also fits a wide range of other General Motors vehicles. Please verify your specific model and location below.
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 06-07 Transmission; (LH engine compartment), (8 cylinder)
ENVOY 08-09 Transmission; (LH engine compartment)
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 3500 VAN 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)
ION 06-07 Transmission; (behind LH strut tower)
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 1500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SIERRA 1500 PICKUP 08-13 Transmission; (next to battery), w/o hybrid option
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 08-13 Transmission; (next to battery), w/o hybrid option
TAHOE 07-09 Transmission; (next to battery)
YUKON 07-09 Transmission; (next to battery)
Frequently Asked Questions
Frequently Asked Questions
What does a VIN-programmed module mean for me?
It means the module arrives ready for installation with no extra steps. We load your car’s VIN and the latest GM software onto the module before we ship it, so it communicates perfectly with your vehicle right out of the box, saving you a trip to the dealer for expensive programming.
Is this a difficult part to replace myself?
For most DIY enthusiasts with basic hand tools, this is a very manageable job. It’s typically located in an accessible part of the engine bay and involves unplugging connectors and removing a few bolts. Our installation guide above covers the key steps.
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 replacement often resolves the issue (and the underlying codes that triggered the P0700), you should ensure other components like wiring and solenoids are in good condition.
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 or dispose of it responsibly without any hassle or extra fees.
Is this part covered by a warranty?
Absolutely. This module is backed by our one-year warranty, giving you peace of mind that you’re installing a quality, reliable part built to meet or exceed OEM standards.