Restore Peak Transmission Performance to Your Buick Allure
Is your 2006-2009 Buick Allure 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 smooth gear changes, managing torque converter lockup, and monitoring overall transmission health. When it fails, it can lead to frustrating drivability issues, poor fuel economy, and potentially catastrophic transmission damage if left unaddressed. This OEM-quality T42 TCM, part number 24243921, is the definitive solution, pre-programmed to your vehicle’s specific VIN for a true plug-and-play installation.
From the Diagnostic Bay
We recently had a 2008 Buick Allure come into the shop with the check engine light on and a complaint of violent 1-2 shifts and occasionally getting stuck in 3rd gear. The owner was worried about a complete transmission rebuild. A quick scan revealed DTC P0700 (Transmission Control System Malfunction) and several solenoid performance codes. Instead of starting a costly internal repair, we identified the root cause: a faulty TCM. We installed one of these VIN-programmed T42 modules. The installation, located under the air cleaner housing, took less than 20 minutes. After clearing the codes, the car shifted like it just rolled off the factory floor. The customer saved thousands and was back on the road the same day.
Symptoms of a Failing Allure Transmission Control Module
A failing TCM can manifest in various ways, impacting your vehicle’s performance and safety. If you’re experiencing any of the following, your TCM is the likely culprit:
- ✔ Harsh, erratic, or delayed gear shifts that disrupt your drive.
- ✔ The vehicle enters “limp mode,” often getting stuck in a single gear (like 2nd or 3rd).
- ✔ Your check engine light or transmission warning light is illuminated on the dashboard.
- ✔ Diagnostic scans show transmission-specific codes, especially P0700, P0750, or other solenoid-related faults.
- ✔ Inability to upshift or downshift properly, leading to poor acceleration and engine performance.
- ✔ A noticeable decrease in fuel efficiency as the transmission operates inefficiently.
- ✔ Complete loss of communication with the module, resulting in a no-shift condition.
Key Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We program this module to your Allure’s exact VIN before shipping. This ensures perfect communication with your vehicle’s other computers, optimal shift strategies based on the latest GM software, and a hassle-free installation without requiring a trip to the dealership for expensive programming.
- ✔ Restores Smooth Operation: By replacing your faulty unit, you restore the precise electronic control needed for seamless gear changes and proper torque converter function, improving both comfort and performance.
- ✔ Built to OEM Specifications: This module is manufactured to meet or exceed original equipment standards, guaranteeing reliable performance and long-term durability for your vehicle.
- ✔ Broad Compatibility: This T42 TCM is a direct replacement for a wide range of GM vehicles from 2006-2014 equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It interchanges with numerous part numbers including 24252114, 24234503, and 24240400.
- ✔ No Core Charge: Keep your old part without the hassle or expense of returning a core. This simplifies the repair process and saves you money.
Easy Installation Process
For the 2006-2009 Buick Allure, the TCM is conveniently located under the lower air cleaner housing. The replacement process is straightforward for a DIY mechanic or any professional technician. Simply disconnect the negative battery terminal, remove the air cleaner assembly to access the module, unplug the electrical connectors, unbolt the old TCM, and install the new one in its place. Reconnect everything, clear any stored diagnostic codes with a scan tool, and you’re ready to drive.
Frequently Asked Questions
What does a VIN-programmed TCM actually do for my car?
VIN programming loads your vehicle’s specific software and calibration files onto the module. This ensures it communicates perfectly with the Engine Control Module (ECM) and other systems, resulting in correct shift points, torque converter lockup, and pressure control for your exact vehicle configuration. It makes the part truly plug-and-play.
Is this a direct replacement for my 2007 Buick Allure’s TCM?
Yes, this T42 TCM is a direct-fit replacement for the 2006-2009 Buick Allure and many other GM models listed in the compatibility chart. It replaces original part number 24243921 and other interchangeable service numbers.
Will I need to visit a dealership after installing this part?
No. Because we pre-program the module to your VIN, no further programming or initialization is required. This saves you the time and significant expense of a dealership visit.
Can a bad TCM cause my transmission to feel like it’s slipping?
Absolutely. A faulty TCM can send incorrect signals to the transmission’s solenoids, causing pressure control issues that mimic the sensation of slipping gears. Replacing the module often resolves these symptoms if the internal mechanical components of the transmission are still in good condition.
Where is the TCM located on a 2006-2009 Buick Allure?
On the Buick Allure for these model years, the Transmission Control Module is typically found attached to or underneath the lower air cleaner housing in the engine bay, making it relatively easy to access for replacement.