Restore Flawless Shifting in Your Buick LaCrosse
Is your 2006-2009 Buick LaCrosse suffering from erratic shifting, getting stuck in gear, or displaying a check engine light? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and ensuring smooth, efficient operation. When it fails, it can make your vehicle unreliable and frustrating to drive. This genuine GM T42 TCM, part number 24235732, is the definitive solution to restore your vehicle’s performance and peace of mind.
From the Diagnostic Bay
We had a 2008 Buick LaCrosse come in with a classic complaint: harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The owner had already spent a small fortune at another shop replacing shift solenoids, but the problem persisted. A quick scan showed a P0700 code, which is a general transmission fault request. Digging deeper, we found intermittent communication errors with the TCM. Instead of throwing more parts at it, we installed a VIN-programmed T42 module. The car immediately shifted like it just rolled off the assembly line. It’s a common scenario: the issue isn’t the mechanical parts inside the transmission, but the electronic controller telling them what to do. This module saves you from costly and unnecessary mechanical repairs by addressing the root cause directly.
Is Your Transmission Control Module Failing?
A faulty TCM can manifest in various ways, often mimicking mechanical transmission failure. Before considering a costly transmission rebuild, check for these common electronic symptoms. A failing module is often the culprit behind these frustrating issues.
- ✔ Erratic and Harsh Shifting: Experiencing sudden, jerky gear changes or a noticeable slam when the transmission shifts.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (usually 2nd or 3rd) to protect the transmission from further damage.
- ✔ Delayed Engagement: A long pause after shifting from Park to Drive or Reverse before the gear engages.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Scan tools may show codes like P0700, P0750, or other solenoid-related faults, even if the solenoids are fine.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup caused by the faulty module can lead to a significant drop in MPG.
The Plug-and-Play Solution: Your 2006-2009 LaCrosse Transmission Module
The biggest hurdle in replacing modern electronic modules is the need for expensive dealership programming. We eliminate that step entirely. Each 2006-2009 LaCrosse Transmission Module is expertly programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that the module arrives with the latest GM software updates and is perfectly calibrated for your vehicle’s specific configuration. The result is a simple, plug-and-play installation that you can perform in your own garage in under an hour. No dealer visits, no special tools, no extra costs.
This T42 TCM is a direct-fit replacement, interchangeable with a wide range of part numbers including 24242391, 24234503, and 24252114. It’s the ideal component for a wide array of GM vehicles from 2006-2014 equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E, making it a versatile and reliable choice for your repair.
Frequently Asked Questions
What does “VIN Programmed” mean?
It means we load your vehicle’s specific VIN into the module before shipping. This ensures the TCM has the correct software and settings for your exact model, engine, and transmission combination, allowing it to work perfectly right out of the box without any need for dealership programming.
Where is the TCM located on my 2006-2009 Buick LaCrosse?
On the 2006-2009 Buick LaCrosse, the Transmission Control Module is typically found attached to the lower air cleaner housing in the engine bay. Always confirm the location before beginning the installation.
Do I need special tools for installation?
No special tools are required. Basic hand tools like a socket set are usually sufficient. The most important step is to disconnect the vehicle’s battery before you begin to ensure the system resets properly. After installation, you can use a standard OBD2 scanner to clear any stored fault codes.
Is there a core charge for my old part?
No, there is no core charge required for this module. You can keep your old part, eliminating the hassle and expense of shipping it back.
Will this fix a P0700 trouble code?
A P0700 code is a general code indicating the TCM has detected a fault. While this module often resolves the underlying cause of a P0700, it’s crucial to diagnose any other accompanying codes (like solenoid or sensor codes) to confirm the TCM is the source of the problem.