Restore Your Minivan’s Drivability with a Reliable Transmission Solution
If your 2006-2007 Buick Terraza is suffering from jerky shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is often the culprit. As a mechanic with over two decades of experience, I’ve seen how a faulty TCM can turn a dependable family vehicle into a source of constant worry. This isn’t just an inconvenience; it’s a safety concern. This direct-replacement T42 TCM, part number 24243921, is the definitive solution to restore your transmission’s performance and your peace of mind.
The core of the problem with these modules is often internal circuit board failure from heat cycles and vibration. This leads to the frustrating, intermittent issues that are so hard to pin down. Our solution is a high-quality module that comes fully pre-programmed to your Terraza’s specific Vehicle Identification Number (VIN). This means you can skip the expensive dealership visit for programming. It arrives at your door ready for a straightforward, plug-and-play installation, making it a perfect project for a DIY enthusiast or a time-saving part for a professional repair shop.
A Technician’s Notebook
I recently worked on a 2007 Terraza that had the classic symptoms: the customer reported it would randomly refuse to shift out of 2nd gear, especially after driving for 20 minutes. They had no check engine light at first, making it a tricky diagnosis. After a test drive, I finally got it to act up and pulled a P0700 (Transmission Control System Malfunction) code. Instead of spending hours testing individual solenoids, experience pointed straight to the TCM. We installed one of our VIN-programmed modules, and the fix was immediate. The van shifted perfectly on the first test drive, saving the customer hundreds in diagnostic time and dealership programming fees.
Is Your Terraza Showing These Transmission Warning Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s time to inspect your module. Ignoring these signs can lead to more significant transmission damage down the road.
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-series solenoid codes, or communication errors.
- ✔ The transmission refuses to upshift or downshift properly.
- ✔ A noticeable drop in fuel economy.
- ✔ Complete loss of communication with the module, preventing the vehicle from starting or shifting out of Park.
DIY-Friendly Installation Guide for Your Terraza
Replacing the 2006-2007 Terraza TCM is a manageable job that you can complete in your own driveway in under 30 minutes. On this specific model, the module is conveniently located.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the Buick Terraza, the TCM is typically found mounted to the driver’s side (LH) strut tower in the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. Then, unbolt the module from its mounting bracket. Keep the hardware in a safe place.
- Install the New Module: Mount the new, pre-programmed TCM onto the bracket and securely tighten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the vehicle and test drive to confirm smooth shifting.
Verified Fitment for Your Vehicle
This module is a guaranteed fit for the following vehicles, but this listing is specifically for the 2006-2007 Terraza TCM. It is also a direct replacement for numerous other GM models, ensuring broad compatibility. It interchanges with part numbers including 24252114, 24234503, 24240400, and more.
- Buick Terraza: 2006-2007 (Transmission; LH strut tower)
- Chevrolet Cobalt: 2006-2010 (Transmission; LH strut tower)
- Chevrolet HHR: 2006-2011 (Transmission; LH engine compartment)
- Chevrolet Uplander: 2006-2009 (Transmission; LH strut tower)
- Pontiac G5/G6: 2006-2010 (Transmission; LH strut tower)
- Saturn Ion: 2006-2007 (Transmission; behind LH strut tower)
- And many other GM vehicles from 2006-2014.
Frequently Asked Questions
Does this module really not require any programming?
That’s correct. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation, with no need for a trip to the dealer or a special scan tool.
Where is the TCM located on my 2006 Buick Terraza?
On the 2006-2007 Terraza, the Transmission Control Module is located in the engine bay, mounted on the driver’s side (LH) strut tower.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep or recycle your old module without any hassle.
What tools are required for the installation?
You’ll only need basic hand tools, such as a socket set and ratchet to remove the mounting bolts and a wrench to disconnect the battery terminal. No specialized equipment is necessary.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a failing TCM is a very common cause, you should ensure other transmission issues have been ruled out. In the vast majority of cases, replacing the faulty module will resolve this code and the underlying issue.