Restore Your Buick Terraza’s Drivability
If your 2006-2007 Buick Terraza is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is often the culprit. As a technician with over two decades of experience, I’ve seen how a faulty TCM can turn a reliable family minivan into a source of daily stress. This isn’t just an inconvenience; it’s a safety concern. This OEM-quality T42 TCM, part number 24234274, is the definitive solution to restore your vehicle’s transmission performance and your peace of mind.
A Technician’s Notebook
A customer brought in their ’07 Terraza with a complaint that was driving them crazy: sometimes it would shift perfectly, but other times it would slam into gear or refuse to shift out of 2nd. They had already replaced a solenoid with no luck. After connecting my scan tool, I saw a generic P0700 code but also intermittent communication loss with the TCM. Instead of a costly transmission teardown, we started with the brain. Installing a VIN-programmed 2006-2007 Terraza TCM resolved all the issues on the first test drive. It’s a classic example of how targeting the electronics first can save hundreds in diagnostic time and unnecessary mechanical repairs.
Is Your Terraza Exhibiting These Transmission Problems?
A failing TCM sends clear warning signs. If you’re experiencing any of the following, it’s time to consider a replacement. Ignoring these symptoms can lead to more significant and expensive transmission damage down the road.
- ✔ Harsh, jerky, or delayed gear shifts that disrupt your drive.
- ✔ The vehicle feels stuck in one gear, often called “limp mode,” as a protective measure.
- ✔ Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- ✔ A noticeable drop in fuel economy as the transmission operates inefficiently.
- ✔ The transmission seems to slip out of gear or struggles to engage when shifting from Park to Drive or Reverse.
The Direct-Fit Solution for Your 2006-2007 Terraza TCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The most significant benefit is our pre-programming service. We flash the module with your vehicle’s specific VIN and the latest GM software updates before it ships. This means you can skip the expensive trip to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, immediately restoring the precise electronic control your transmission needs for smooth shifting, proper torque converter lockup, and reliable operation.
DIY Installation: A Quick Guide for Your Terraza
Replacing the TCM on your Terraza is a straightforward job that most DIY enthusiasts can complete in under an hour with basic hand tools. For the 2006-2007 Terraza, the module is conveniently located.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On your Terraza, you will find the TCM mounted on the driver’s side strut tower in the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the mounting bolts holding the old module in place.
- Install the New TCM: Mount the new module securely with the original bolts. Reconnect the electrical harnesses, ensuring they click firmly into place.
- Final Steps: Reconnect the battery terminal. While the module is pre-programmed, it’s good practice to use a basic OBD-II scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility List
This T42 Transmission Control Module is a direct replacement for a wide range of General Motors vehicles. While this page focuses on the Buick Terraza, please confirm your model and year below. This part is interchangeable with service numbers including 24252114, 24234503, 24230461, 24235340, and others.
This part will fit these makes and models with these options:
BUICK TERRAZA 06-07 Transmission; (LH strut tower)
… and many other GM models including Chevrolet Cobalt, HHR, Impala; Pontiac G6; Saturn Vue, Ion; GMC Savana; and more from 2006-2014. Please refer to the full fitment list in the product data for complete compatibility.
Frequently Asked Questions
What is VIN programming and why is it important?
VIN programming involves loading your vehicle’s unique Vehicle Identification Number and corresponding factory software onto the module. This ensures the TCM communicates perfectly with your engine computer and other systems, controlling shift points and pressures exactly as the manufacturer intended. It eliminates the need for a separate, costly programming service at a dealership.
Do I need any special tools for this installation?
No special tools are required. A basic socket set to remove the mounting bolts and a flathead screwdriver to help release the connector clips are typically all that’s needed. The entire process is designed to be accessible for a home mechanic.
Will this fix a P0700 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 (like internal failure) that triggers a P0700, it’s always wise to scan for more specific codes (e.g., P0751, P0756) to confirm the diagnosis. In many cases, replacing a faulty TCM is the correct fix.
Is there a core charge for my old part?
No, there is no core charge or need to return your old module. You can keep it or dispose of it at your convenience, making the process simpler and hassle-free.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure perfect programming for your specific Terraza.