Restore Flawless Shifting in Your Buick Terraza
Is your 2006-2007 Buick Terraza suffering from harsh 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 monitoring system health. When it fails, it can cause a cascade of frustrating and potentially damaging issues, from poor fuel economy to complete transmission shutdown. This OEM-quality T42 TCM, service number 24235754, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
From the Diagnostic Bay
We recently had a 2007 Terraza come into the shop with a complaint of intermittent ‘limp mode.’ The owner had already replaced a shift solenoid based on a generic code, but the problem persisted. The van would drive fine for days, then suddenly refuse to shift out of 3rd gear. After running a full diagnostic, we noticed erratic voltage readings from the TCM. Instead of a costly transmission rebuild, we installed a VIN-programmed T42 module. The van’s shifting behavior returned to factory-smooth, and the persistent trouble codes were gone for good. It’s a perfect example of how targeting the electronic brain can solve what seems like a major mechanical failure.
Symptoms of a Failing T42 TCM
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle gets stuck in a single gear (often called ‘limp mode’ or ‘fail-safe mode’).
- ✔ Illumination of the Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are stored.
- ✔ A noticeable decrease in fuel efficiency as the transmission operates inefficiently.
- ✔ The transmission may feel like it’s slipping between gears or failing to engage properly.
- ✔ Inability to upshift or downshift, leading to poor acceleration or high RPMs at cruising speed.
Your Programmed 2006-2007 Terraza Transmission Control Module Solution
Don’t let a faulty module sideline your vehicle. This replacement Terraza Transmission Control Module is engineered to meet and exceed original equipment standards. The most significant benefit is our professional VIN programming service. Before the part ships, we load it with the latest GM software specific to your vehicle’s VIN. This critical step ensures that the module communicates flawlessly with your engine computer (ECU) and other vehicle systems right out of the box. You can bypass the expensive and time-consuming trip to the dealership for programming, saving you hundreds of dollars and getting your van back on the road faster.
Installation and Compatibility
For the 2006-2007 Buick Terraza, the TCM is conveniently located at the LH (driver’s side) strut tower in the engine compartment, making it accessible for a straightforward installation that can typically be completed in under 30 minutes with basic hand tools. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Once the new module is connected and the battery is reconnected, the vehicle is ready to go. This module is also a direct replacement for a wide range of other GM vehicles utilizing the T42 platform and 4-speed automatic transmissions like the 4L60E and 4L65E. It interchanges with numerous part numbers, including 24242391, 24234503, and 24252114, ensuring broad compatibility.
Frequently Asked Questions
Why is VIN programming necessary for this Terraza Transmission Control Module?
VIN programming loads your vehicle’s specific software, including shift strategies and communication protocols, onto the module. Without it, the TCM won’t work correctly with your engine and other systems, leading to continued shifting problems or a no-start condition. Our pre-programming makes it a true plug-and-play part.
Is this a difficult part to install myself?
For most DIY mechanics, this is a relatively simple installation. On the Terraza, it’s located at the driver’s side strut tower. The process involves disconnecting the battery, removing a few electrical connectors, and unbolting the module. No special tools are required.
Will this module fix a P0700 diagnostic trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause that triggers a P0700, it’s essential to have the vehicle scanned for more specific codes (e.g., P0751, P0756) to confirm the TCM is the likely point of failure.
Do I need to send my old TCM back?
No, there is no core charge for this part. You can keep your old module or dispose of it, saving you the time and hassle of managing a core return.
What is the warranty on this TCM?
This transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your repair.