Restore Peak Performance to Your Buick’s Transmission
Are you experiencing erratic shifting, a check engine light that won’t go away, or the dreaded “limp mode” in your 2006-2009 Buick Allure? 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 lead to frustrating drivability issues, poor fuel economy, and potentially catastrophic transmission damage if left unaddressed. This genuine GM T42 TCM, service part number 24240400, is the definitive solution to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
We recently had a 2008 Buick LaCrosse (which shares the same platform as the Allure) come into the shop with a persistent P0752 code (Shift Solenoid ‘A’ Stuck On). The owner had already spent hundreds of dollars replacing the solenoid twice at another shop, but the problem kept returning. After a quick diagnostic check, we suspected the driver circuit within the TCM itself was faulty, not the solenoid. We installed one of our VIN-programmed T42 modules, cleared the codes, and took it for a test drive. The shifting was immediately crisp and precise, and the code never returned. The customer was thrilled to have a final fix that cost less than another round of guesswork.
Is Your Allure Transmission Control Module Failing?
A failing TCM doesn’t just cause minor annoyances; it compromises your vehicle’s safety and performance. This module is the key to solving complex transmission problems that often get misdiagnosed. By replacing your faulty unit with our pre-programmed module, you are directly addressing the root cause of these issues. Recognize the warning signs before they lead to a more costly repair.
- ✔ Harsh or Delayed Shifting: Experiencing jarring shifts or a noticeable delay when the transmission engages from park to drive or reverse.
- ✔ Stuck in Gear: The vehicle may feel sluggish and refuse to shift out of a low gear (often called limp mode) to protect the transmission from 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, P0750, P0753, or other solenoid-related faults are stored in the vehicle’s computer.
- ✔ Poor Fuel Economy: Inefficient shifting and incorrect torque converter lockup can lead to a significant drop in MPG.
- ✔ No Communication: In severe cases, a scan tool may be unable to communicate with the TCM, indicating a complete module failure.
The Plug-and-Play Advantage: VIN Programming Included
Forget about expensive dealership visits and additional programming fees. Our core advantage is that every module is expertly programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the TCM is loaded with the latest GM software updates and is perfectly calibrated for your Allure’s specific engine, transmission, and tire size. The result is a true plug-and-play installation. Simply install the module, connect the harnesses, and you’re ready to drive. This process resolves common software-related DTCs and guarantees optimal performance right out of the box.
Guaranteed Fitment and Compatibility
This T42 TCM is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, ensuring a perfect match for your repair needs. Compatible service numbers include: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and more. Trust in a part built to strict OEM standards, backed by our one-year warranty for your peace of mind.
Frequently Asked Questions
What is a T42 TCM and what does it do?
The T42 Transmission Control Module (TCM) is a dedicated computer that controls all functions of your vehicle’s automatic transmission. It receives data from various sensors (like vehicle speed and engine RPM) to determine the perfect moment to shift gears, control hydraulic pressure, and engage the torque converter clutch for maximum efficiency.
Is this module truly plug-and-play?
Yes. Because we program the module to your car’s VIN before shipping, it arrives ready for installation. You do not need to take it to a dealership or mechanic for additional programming. This saves you time and money.
Where is the TCM located on my 2007 Buick Allure?
On the 2006-2009 Buick Allure (and its sister model, the LaCrosse), the TCM is typically located under the air cleaner housing in the engine bay. It’s an accessible location that makes for a straightforward replacement, often taking less than 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating that the TCM has detected a problem and has requested the Check Engine Light to be turned on. While the P0700 itself doesn’t specify the issue, it is very often triggered by an internal TCM failure. Replacing a faulty TCM will typically resolve the P0700 and any other transmission-specific codes it has stored.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep your old module, which simplifies the purchasing process and saves you the hassle and cost of return shipping.
How do I provide my VIN for programming?
Simply enter your 17-digit Vehicle Identification Number (VIN) in the designated field during the checkout process. Our technicians will use this to ensure the module is programmed correctly for your specific vehicle before it is shipped.