Restore Peak Transmission Performance in Your Buick LaCrosse
Is your 2006-2009 Buick LaCrosse suffering from harsh shifting, delayed gear engagement, or getting stuck in limp mode? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating precise gear changes and ensuring smooth operation. When it fails, it can lead to frustrating driving experiences, poor fuel economy, and potentially severe transmission damage if left unaddressed. This genuine quality T42 TCM, service part number 24240400, is the definitive solution to restore your vehicle’s factory performance.
Expert Pro Tip
Before installing your new TCM, disconnect the vehicle’s battery for at least 15 minutes. This helps reset the Powertrain Control Module’s adaptive learning memory, allowing it to sync cleanly with the new, pre-programmed TCM. After installation and reconnecting the battery, use a scan tool to clear any stored Diagnostic Trouble Codes (DTCs) for a fresh start.
Diagnosing a Faulty 2006-2009 LaCrosse TCM
A failing TCM can manifest in several ways, often starting as intermittent issues before becoming persistent problems. If you’re noticing any of the symptoms below, it’s highly likely your TCM is the culprit. This module is the direct answer for these common failures, eliminating the guesswork and getting your car back on the road quickly. It directly replaces part numbers like 24252114, 24234503, and 24240400, ensuring broad compatibility.
Symptoms of a Failing LaCrosse Transmission Control Module
- ✔ Erratic Shifting: Your LaCrosse may shift harshly, slam into gear, or hesitate between shifts.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes like P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (e.g., P0750-P0758) will be stored.
- ✔ Limp Mode: The vehicle may refuse to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lock-up issues caused by a bad TCM can significantly reduce your MPG.
- ✔ No Communication: In severe cases, a scan tool may be unable to communicate with the TCM, indicating a complete failure.
This module is engineered to OEM specifications to provide a reliable and long-lasting repair for your Buick LaCrosse. It also fits a wide range of other GM vehicles from 2006-2014, including the Chevrolet Impala, GMC Sierra, and Cadillac DTS, making it a proven component across the GM lineup. For your LaCrosse, this unit is located in the lower air cleaner housing, making for a straightforward installation that can typically be completed in under an hour.
The Plug-and-Play Advantage: VIN Programming Included
The single biggest challenge when replacing a modern TCM is the need for expensive and time-consuming dealership programming. We eliminate that step entirely. Simply provide your vehicle’s VIN during checkout, and our technicians will program this module with the latest GM-certified software specific to your LaCrosse. It arrives at your door ready for a true plug-and-play installation. This ensures optimal shift points, torque converter strategy, and communication with other vehicle modules right out of the box.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s specific VIN. It is a plug-and-play solution that does not require any additional programming or trips to the dealership, saving you time and money.
Where is the TCM located on my 2006-2009 Buick LaCrosse?
On the 2006-2009 Buick LaCrosse, the T42 TCM is typically located inside or attached to the lower air cleaner housing in the engine bay. Always disconnect the battery before beginning the replacement process.
Will this fix my transmission error codes like P0700?
Yes, if the TCM itself is the root cause of the code. A faulty TCM is a very common cause for codes like P0700 and related solenoid codes. Replacing it with this programmed unit will resolve those issues.
Is there a core charge for my old part?
No, we do not require a core return. You can keep your old module without any additional charges or hassle.
What kind of warranty is included with this part?
This transmission control module is backed by our standard one-year warranty, covering any defects in materials or workmanship for your peace of mind.