Is Your Buick Lucerne Shifting Erratically?
There’s nothing more frustrating than a luxury sedan that refuses to shift smoothly. If your 2006-2011 Buick Lucerne is experiencing harsh clunks between gears, getting stuck in limp mode, or throwing transmission-related check engine lights, the problem often points directly to a failing Transmission Control Module (TCM). In my 20+ years of diagnosing these systems, I’ve seen countless drivers fear a catastrophic transmission failure costing thousands, when the real culprit was this small electronic brain.
The Simple, Permanent Fix for Complex Shifting Problems
Don’t let a faulty module sideline your car. This OEM-quality T42 Transmission Control Module, corresponding to part number 24235340, is the definitive solution. The most critical feature is our pre-programming service. We flash the module with your vehicle’s specific VIN and the latest GM software updates before it even ships. This means it’s a true plug-and-play component, eliminating the need for an expensive trip to the dealership for programming. You get a reliable part that’s ready for installation right out of the box.
Expert Pro Tip: A customer’s 2008 Lucerne came in last week with a quote for a full transmission rebuild from another shop. The symptoms were classic: delayed engagement into drive and harsh 1-2 shifts. I scanned the vehicle and found a P0752 code (Shift Solenoid A Stuck On). While this can indicate an internal issue, I’ve learned to always check the module first. We inspected the TCM connectors for corrosion (they were clean) and then installed one of our pre-programmed modules. The problem vanished instantly. The original TCM’s internal driver for that solenoid had failedโa common issue. This saved the customer over two thousand dollars.
Common Symptoms of a Failing 2006-2011 Lucerne Transmission Module
A failing TCM can manifest in various ways as it loses its ability to communicate with the transmission’s sensors and solenoids. Be on the lookout for:
- โ Harsh, delayed, or unpredictable gear shifts.
- โ The vehicle being stuck in a single gear (limp mode), often 2nd or 3rd.
- โ Illuminated Check Engine Light or Transmission Warning Light.
- โ Diagnostic Trouble Codes (DTCs) such as P0700, P0750-P0758, or other solenoid-specific faults.
- โ A sudden drop in fuel economy due to inefficient shifting.
- โ Complete loss of communication with the scan tool.
Plug-and-Play Installation: No Dealer Visit Required
Replacing the TCM on your Lucerne is a straightforward job that most DIY mechanics can complete in under 30 minutes with basic hand tools. This module is engineered for a perfect fit, restoring your car’s factory performance.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electronic component replacement.
- Locate the Module: On the 2006-2011 Buick Lucerne, the TCM is typically found in the engine compartment on the driver’s side (LH), often near the strut tower or under the air cleaner housing.
- 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 Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is programmed, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU to ensure a clean slate.
Guaranteed Compatibility and Interchange Information
This module is a direct replacement for a wide range of GM vehicles and is interchangeable with numerous part numbers, ensuring you get the right component for the job. It is a verified replacement for part number 24235340 and others including: 24252114, 24234503, 24230461, 24234274, 24235754, 24238856, 24239224, 24239926, 24240400, and more. Restore the smooth, reliable performance your Buick was designed for and order with confidence today.