If your 2006-2007 Terraza is suffering from unpredictable shifting, getting stuck in gear, or has the check engine light glaring at you, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen how a faulty TCM can make a reliable family minivan feel unsafe and unpredictable. This isn’t just an inconvenience; it’s a critical failure that compromises drivability. This T42 series TCM is the direct-fit, reliable solution you need, arriving fully programmed to your Terraza’s specific VIN for a true plug-and-play repair.
A Technician’s Notebook: The Terraza That Wouldn’t Shift
A customer brought in their ’06 Terraza a few months back with a classic complaint: “It slams into gear, and sometimes it feels like it won’t shift at all.” The van was stuck in what we call ‘limp mode,’ defaulting to 3rd gear to protect the transmission from further damage. A quick scan showed a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). While the solenoid code pointed to a specific part, my experience with these GM platforms suggested the TCM was the root cause. The internal drivers that control the solenoids often fail. Instead of a costly and time-consuming internal transmission repair, we installed one of our VIN-programmed TCMs. In under an hour, the codes were cleared, the van was shifting smoothly, and the customer was back on the road, saving hundreds compared to a dealership visit.
Is Your Terraza Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Catching it early can save you from more expensive repairs down the line. Look out for these common symptoms:
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750-series solenoid codes, or communication errors.
- ✔ A sudden, noticeable drop in fuel economy as the transmission operates inefficiently.
- ✔ The transmission seems to slip out of gear or fails to engage properly from a stop.
DIY Installation: A 30-Minute Fix
One of the best features of this module is that it’s designed for a straightforward installation. You don’t need a professional lift or specialized tools. For the 2006-2007 Terraza, the TCM is conveniently located and easy to access.
- 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 your Terraza, the TCM is found at the left-hand (driver’s side) strut tower in the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Mount the new module securely onto the bracket and reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic scan tool, use it to clear any stored fault codes. A short test drive will confirm the shifting issues are resolved.
Verified Fitment For Your Vehicle
This module, part number 24238856, is the correct replacement for your 2006-2007 Terraza. It is also a direct replacement for a wide range of other GM vehicles and interchanges with numerous part numbers, including 24252114, 24234503, 24230461, 24234274, and more, ensuring broad compatibility. While this listing is specific to the Terraza, this part also fits models like the Chevrolet Impala, GMC Savana, Buick Allure, Pontiac G6, and Saturn Vue, among others.
Frequently Asked Questions
What does “VIN Programmed” mean for me?
It means this module arrives ready for installation right out of the box. We load it with your Terraza’s specific Vehicle Identification Number (VIN) and the latest GM software. This ensures it communicates perfectly with your engine computer and other systems, eliminating the need for an expensive programming service at a dealership.
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 without any extra hassle or fees.
Will this fix a P0700 code?
In many cases, yes. The P0700 code is a general fault code indicating the TCM has detected a problem. A failing TCM is often the root cause that triggers the P0700 and other specific transmission codes. Replacing the faulty module with this new one will resolve the underlying issue.
Where is this module located on my 2007 Terraza?
For the 2006-2007 Terraza, the Transmission Control Module is located in the engine bay, mounted to the driver’s side (LH) strut tower. It’s easily accessible once you open the hood.
Is this a genuine OEM part?
This is a high-quality replacement part built to meet or exceed original equipment manufacturer (OEM) standards for fit, form, and function. It’s backed by a one-year warranty to ensure reliable, long-lasting performance.