Is Your Buick LaCrosse Shifting Erratically?
If you’re dealing with harsh shifts, delayed gear engagement, or a check engine light on your 2006-2009 Buick LaCrosse, you might be worried about a major transmission failure. Before you budget for a costly rebuild, consider the real culprit: a faulty Transmission Control Module (TCM). In my 20+ years of diagnostics, I’ve seen countless GM vehicles where the TCM, the electronic brain of the transmission, was the sole cause of these frustrating and concerning symptoms. This isn’t a mechanical problem; it’s an electronic one that has a straightforward fix.
This OEM-quality T42 TCM, part number 24235732, is the definitive solution. It arrives at your door fully pre-programmed to your LaCrosse’s specific Vehicle Identification Number (VIN). This means no expensive trips to the dealership for programmingโit’s a true plug-and-play repair you can perform right in your driveway, restoring the smooth, reliable performance you expect from your Buick.
Real-World Scenario: The LaCrosse That Saved Thousands
A customer’s 2008 LaCrosse came into my shop last month with the transmission stuck in 3rd gear (limp mode) and a P0700 code. Another shop had quoted them over $3,000 for a transmission rebuild. After a quick scan and data check, I suspected the TCM. We swapped in a VIN-programmed module, and in under an hour, the car was shifting perfectly through all gears. The problem wasn’t the transmission; it was the computer telling it what to do. This simple replacement saved the customer thousands of dollars and a lot of unnecessary stress.
Symptoms of a Failing LaCrosse TCM
A bad TCM can manifest in several ways. If you’re experiencing any of the following, this module is your likely solution:
- โ Sudden, harsh, or banging shifts between gears.
- โ The vehicle feels stuck in one gear and won’t upshift or downshift.
- โ Check Engine Light or Transmission Warning Light is illuminated.
- โ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- โ Poor acceleration and a noticeable drop in fuel economy.
- โ Delayed engagement when shifting from Park to Drive or Reverse.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new 2006-2009 LaCrosse Transmission Module is a simple process. For your specific vehicle, the TCM is typically located under the lower air cleaner housing, making it accessible with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system’s memory.
- Locate the Module: Remove the air cleaner assembly to access the TCM mounted below it.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. While not always necessary, using a basic scan tool to clear any stored codes is good practice.
Guaranteed Compatibility and Reliability
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. It is built to meet or exceed original equipment standards for a long service life.
- Part Number: 24235732
- Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24252114, 24255280, 24256960, 24235753, 24240449, YNXS
Don’t let a faulty TCM sideline your vehicle. Order this pre-programmed 2006-2009 LaCrosse Transmission Module today and restore your car’s shifting performance with confidence.