Restore Peak Performance to Your Buick’s Transmission
If your 2006-2009 Buick LaCrosse is suffering from harsh shifting, slipping gears, or has entered a frustrating ‘limp mode,’ a failing Transmission Control Module (TCM) is the most likely culprit. This critical component is the electronic brain of your automatic transmission, responsible for managing shift points, torque converter lockup, and fluid pressure. When it fails, it can cause a host of drivability issues and illuminate your check engine light. This replacement T42 TCM, part number 24235753, is the definitive solution to restore your vehicle’s smooth, reliable operation.
From the Diagnostic Bay
We recently had a 2008 LaCrosse come in with classic symptoms: delayed engagement into drive and a hard 1-2 shift that would rattle your teeth. The owner had already spent money replacing shift solenoids with no improvement. A quick scan showed a generic P0700 code and intermittent solenoid circuit faults. We knew from experience that these phantom codes often point back to the module itself. After installing one of our VIN-programmed TCMs, the car shifted like it just left the showroom. The customer was thrilled to have a simple, effective fix without wasting more time and money on incorrect diagnoses.
Diagnosing a Faulty 2006-2009 LaCrosse TCM
A failing TCM can manifest in several ways, often mistaken for internal transmission failure. Before considering a costly transmission replacement, check if your vehicle is exhibiting any of the following common symptoms. This module is the correct solution for these issues.
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (limp mode), typically 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes are present.
- ✔ Failure to upshift or downshift properly.
- ✔ A noticeable decrease in fuel economy.
- ✔ Intermittent loss of communication with the TCM on a scan tool.
The Plug-and-Play Advantage: VIN Programming Included
The biggest hurdle in replacing modern vehicle electronics is the need for expensive dealership programming. We eliminate that step entirely. Every module we ship is pre-programmed to your LaCrosse’s specific Vehicle Identification Number (VIN). This ensures that the TCM has the latest GM software and is perfectly calibrated for your vehicle’s engine, tire size, and gear ratios right out of the box. Simply install the module, and you’re ready to go. No trips to the dealer, no extra fees, just a straightforward repair.
Installation Guide
For the 2006-2009 Buick LaCrosse, the TCM is conveniently located in the engine bay, situated under the air cleaner housing. The replacement process is simple and can typically be completed in under 30 minutes with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Access the Module: Remove the air cleaner box to gain clear access to the TCM.
- Disconnect and Remove: Carefully unplug the electrical connectors and unbolt the old module from its mounting bracket.
- Install the New TCM: Mount the new module, reconnect the electrical harnesses, and reinstall the air cleaner box.
- Final Steps: Reconnect the battery. While our programming handles the calibration, it’s good practice to use a scan tool to clear any stored DTCs from the system.
Frequently Asked Questions
What does VIN programming mean for my LaCrosse?
VIN programming means we load your vehicle’s specific factory software onto the TCM before we ship it. This ensures it communicates perfectly with your car’s engine computer and other systems, just like the original part, for optimal performance and fuel efficiency without any additional setup.
Do I need a mechanic to install this TCM?
Many of our customers with basic mechanical skills install this part themselves. For the LaCrosse, it’s located under the air cleaner box. If you’re comfortable using basic hand tools and disconnecting a battery, it’s a very manageable DIY job that can be done in under an hour.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, the problem is the TCM itself. Replacing a faulty module with our pre-programmed unit is a very common and effective way to resolve a P0700 code and related transmission faults.
Is there a core charge for my old module?
No, there is no core charge. You can keep your old part, so you don’t have to worry about the cost or hassle of shipping it back to us.
How do I know this is the right part for my car?
This module is a direct replacement for part number 24235753 and other interchangeable numbers listed in the description. It is the correct fit for 2006, 2007, 2008, and 2009 Buick LaCrosse models. When you provide your VIN at checkout, we double-check compatibility and program it specifically for your vehicle.