Is Your Buick Allure Experiencing Transmission Problems?
If you’re dealing with erratic shifting, a car that feels stuck in one gear, or a persistent check engine light, a failing Transmission Control Module (TCM) is likely the culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and ensuring overall drivetrain efficiency. When it fails, the symptoms can range from annoying to debilitating, often mimicking a catastrophic mechanical failure. This VIN-programmed T42 TCM is the definitive solution for your 2006-2009 Buick Allure, restoring the crisp, predictable performance you expect.
From the Diagnostic Bay
We had a 2008 GMC Sierra come in with classic symptoms of a bad transmission—harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The owner had already spent a small fortune at another shop that replaced two shift solenoids with no improvement. After a quick scan, we saw a P0700 code, which is a general transmission fault request. Digging deeper, we found intermittent communication errors with the TCM. Instead of throwing more hard parts at it, we installed one of our VIN-programmed T42 modules. The truck was shifting perfectly within 30 minutes. It’s a classic case where the electronic controller was the real issue, not the mechanical parts inside the transmission.
Signs You Need a New 2006-2009 Allure Transmission Module
A failing TCM can manifest in various ways, often leading to misdiagnosis. If your vehicle is showing any of the following signs, this module is the component you need to get back on the road reliably.
- ✔ Erratic and Harsh Shifting: Your vehicle may slam into gear, hesitate between shifts, or feel like it’s slipping unexpectedly.
- ✔ Stuck in Limp Mode: The transmission may refuse to shift out of 2nd or 3rd gear as a protective measure, severely limiting your vehicle’s speed.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes associated with a failing TCM include P0700, P0750, P0753, P0758, and other solenoid-related faults.
- ✔ Delayed Engagement: A noticeable delay when shifting from Park into Drive or Reverse is a strong indicator of a TCM issue.
- ✔ Poor Fuel Economy: Inefficient shifting and incorrect torque converter lockup caused by a faulty module can lead to a significant drop in MPG.
- ✔ Complete Communication Loss: In severe cases, the TCM may fail entirely, preventing the vehicle from starting or shifting out of Park.
The Plug-and-Play Advantage: VIN Programmed for Your Vehicle
This isn’t just a generic, off-the-shelf part. We pre-program each module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures seamless integration with your car’s existing systems. The module arrives loaded with the latest GM software updates, making it a true plug-and-play solution. You can avoid the expensive trip to the dealership for programming and complex setup procedures. Simply install the module, clear any old codes, and drive away.
Broad Compatibility Across the GM Lineup
While this is the perfect fit for your 2006-2009 Buick Allure, the T42 TCM was a workhorse for General Motors, used in a vast array of vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is a direct replacement for numerous part numbers, including 24252114, 24234503, 24230461, and many more. It’s found in everything from hardworking trucks like the Chevrolet Silverado and GMC Sierra to family SUVs like the Tahoe and Yukon, and sedans like the Impala and LaCrosse.
Frequently Asked Questions
What does a Transmission Control Module (TCM) do?
The TCM acts as the central computer for your automatic transmission. It collects data from various sensors (like vehicle speed, throttle position, and engine RPM) to determine the optimal time to shift gears, control hydraulic pressure, and engage the torque converter clutch for maximum efficiency and smoothness.
What does ‘VIN Programmed’ mean for me?
‘VIN Programmed’ means we flash the module with your vehicle’s specific factory software using your VIN. This ensures the TCM communicates perfectly with your engine computer and other vehicle systems right out of the box, eliminating the need for additional, costly programming at a dealership.
Is this part difficult to install?
Installation is generally straightforward for a DIYer with basic tools. The TCM is typically located in the engine bay (e.g., near the battery, on the strut tower, or under the air cleaner box). The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. The entire job often takes less than 30 minutes.
Will this module 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 P0700 itself doesn’t pinpoint the failure, it is very often triggered by an internal fault within the TCM. Replacing a faulty TCM is a common and effective way to resolve a P0700 code and the specific codes that caused it.
Do I need to send my old TCM back (core charge)?
No, there is no core charge for this part. You can keep your old module, saving you the time and hassle of packaging and shipping it back to us.