Is Your Buick Allure Shifting Erratically?
A faulty Transmission Control Module (TCM) can turn a smooth ride into a frustrating and unpredictable experience. If your 2006-2009 Buick Allure is suffering from harsh shifts, getting stuck in gear, or displaying a check engine light with transmission-related codes, the TCM is the most likely culprit. This module acts as the brain of your automatic transmission, controlling everything from gear changes to torque converter lockup. When it fails, the entire system’s performance is compromised. Restore the precision and reliability of your vehicle with our pre-programmed T42 Transmission Control Module, engineered to be a direct-fit solution.
From the Diagnostic Bay
We recently had a 2008 Buick LaCrosse (which shares the same platform as the Allure) come into the shop with classic signs of a failing transmission. The owner was convinced he needed a complete, costly rebuild. The car would slam into gear and was stuck in ‘limp mode.’ Our first step was to scan for codes, which revealed several solenoid circuit faults (P0750 series). Instead of condemning the transmission itself, we identified the common point of failure: the TCM. After installing this exact VIN-programmed T42 module, the car shifted flawlessly. A simple, 30-minute replacement saved the customer thousands of dollars and resolved all the alarming symptoms.
Symptoms of a Failing Allure Transmission Control Module
- ✔️ Harsh or Delayed Shifting: Experiencing sudden jerks, clunks, or significant delays when the transmission changes gears.
- ✔️ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- ✔️ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔️ Diagnostic Trouble Codes (DTCs): Common codes like P0700 (Transmission Control System Malfunction) or various solenoid codes are present.
- ✔️ Poor Fuel Economy: Inefficient shifting and incorrect torque converter lockup can lead to a noticeable drop in MPG.
- ✔️ No Communication: A scan tool may be unable to communicate with the TCM, indicating a complete module failure.
The Premier Solution: A Pre-Programmed T42 TCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. Each module is meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the module has the latest GM software updates and is perfectly calibrated for your Allure’s engine, transmission, and tire size. This eliminates the need for an expensive trip to the dealership for programming, making the installation a true plug-and-play process. Built to meet or exceed original equipment standards, this module provides a dependable and long-lasting fix for your transmission problems.
Key Features & Benefits
- ✔️ VIN Programmed for Your Allure: Arrives ready for installation with no additional programming required. Just plug it in and go.
- ✔️ Restores Original Performance: Cures common shifting issues, eliminates error codes, and brings back the smooth operation you expect.
- ✔️ OEM-Quality Construction: Engineered for durability and reliability, ensuring it can handle the demands of daily driving.
- ✔️ Broad Compatibility: This T42 TCM is a direct replacement for multiple part numbers, including 24252114, 24234503, 24238856, and more, fitting a wide range of GM vehicles.
- ✔️ No Core Charge: Keep your old part without the hassle or expense of returning a core.
Frequently Asked Questions
What does this Transmission Control Module do?
The TCM is a computer that processes data from various sensors on your engine and transmission to control when and how the automatic transmission shifts gears. It ensures smooth, efficient operation and optimal fuel economy.
Why is VIN programming so important?
VIN programming loads your vehicle’s specific software and calibrations onto the module. Without it, the TCM won’t know how to operate your specific transmission correctly, leading to continued shifting problems or the vehicle not starting at all. Our pre-programming saves you a costly and time-consuming trip to the dealership.
Is this part difficult to install myself?
For most DIYers with basic tools, installation is straightforward and typically takes less than 30 minutes. The module is usually located in the engine bay (for the Allure, it’s often under the air cleaner housing). Simply disconnect the battery, unplug the old module, install the new one, and reconnect the battery.
Will this fix my P0700 error code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal short circuits causing solenoid codes), you should always diagnose any other codes that appear alongside P0700. In many cases, replacing a faulty TCM will clear all related codes.
What happens if I don’t replace a failing TCM?
Continuing to drive with a faulty TCM can lead to more severe and expensive damage. Poor shifting can cause excessive wear on internal transmission components like clutches and bands, potentially leading to a complete transmission failure that requires a full rebuild or replacement.