Is Your Buick LaCrosse Shifting Erratically?
Are you experiencing harsh shifting, delayed gear engagement, or a check engine light that points to a transmission issue? A failing Transmission Control Module (TCM) can turn your comfortable LaCrosse into a source of constant worry. This pre-programmed T42 TCM is the definitive, hassle-free solution to restore the smooth, reliable performance you expect from your vehicle.
Common LaCrosse TCM Failure Symptoms & Your Solution
A faulty TCM can manifest in several ways, often getting worse over time. If you’re noticing any of the following, it’s a clear sign that the electronic brain of your transmission needs attention. This module is engineered to solve these exact problems:
- Abrupt, harsh, or jerky gear changes.
- The vehicle getting stuck in one gear (often called “limp mode”).
- Transmission-related warning lights illuminated on your dashboard.
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- A noticeable decrease in fuel economy due to inefficient shifting.
By installing our Programmed 2006-2009 Buick LaCrosse Transmission Control Module, you are not just replacing a part; you are providing a direct and permanent fix, calibrated specifically for your car’s unique identity.
Features & Tangible Benefits
- ✔ VIN-Programmed for Your LaCrosse: We flash this module with your vehicle’s specific VIN and the latest GM software before it ships. This means no expensive trips to the dealership for programming—it’s ready for plug-and-play installation right out of the box.
- ✔ Restored Driving Performance: Experience the return of smooth, crisp, and predictable shifting. This module ensures your transmission operates exactly as the manufacturer intended, improving both comfort and vehicle responsiveness.
- ✔ OEM-Standard Quality: Built to meet or exceed original equipment specifications, this module provides a reliable, long-term solution to common transmission electronic failures. It is a direct replacement for service numbers like 24252114, 24234503, and 24238856.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
- ✔ No Core Charge: Keep your old part without any extra fees or the hassle of returning a core.
An Expert’s Insight: Why VIN Programming is Non-Negotiable
“In modern vehicles like your Buick LaCrosse, the TCM is more than a simple controller; it’s part of a complex network that communicates with the engine computer, ABS, and other systems. Generic, non-programmed modules often cause more problems than they solve because they don’t have the specific calibration data for your car’s engine size, axle ratio, and tire size. Our VIN programming process ensures every parameter is perfectly matched, which is the key to not just fixing the problem, but restoring original performance and efficiency. It’s the difference between a temporary patch and a professional repair.”
Frequently Asked Questions
What does a TCM do in my Buick LaCrosse?
The Transmission Control Module (TCM) is the computer that controls all the functions of your automatic transmission. It reads data from various sensors to determine the perfect moment to shift gears, control hydraulic pressure, and lock the torque converter, ensuring smooth operation and optimal fuel efficiency.
Is this part difficult to install?
For the 2006-2009 LaCrosse, the TCM is typically located in the engine bay under the air cleaner housing. Installation is straightforward for a DIYer with basic tools and usually takes under an hour. Simply disconnect the battery, remove the air cleaner box, unplug the old module’s connectors, unbolt it, and install the new one in its place.
Do I need to take my car to a dealer after installation?
No. The most significant benefit of our service is that the module arrives pre-programmed to your VIN. This eliminates the need for any additional, costly programming at a dealership or repair shop. It is a true plug-and-play solution.
How do I know this is the correct part for my car?
This Programmed 2006-2009 Buick LaCrosse Transmission Control Module is guaranteed to be compatible with your vehicle. We use your VIN during the programming process to ensure a perfect match. It is a direct replacement for numerous part numbers, including 24238856.
What happens if I don’t replace a failing TCM?
Ignoring a failing TCM can lead to more severe and expensive problems. Continued erratic shifting can cause premature mechanical wear and tear on internal transmission components like clutches and bands, potentially leading to a complete transmission failure requiring a costly rebuild.
Is there a core charge for this module?
No, there is absolutely no core charge. You are not required to send your old, faulty module back to us, saving you time and money on return shipping.