Restore Your Minivan’s Performance with a Reliable Transmission Solution
Is your 2006-2007 Buick Terraza struggling with erratic shifting, getting stuck in gear, or showing a check engine light? These are classic signs of a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the TCM is responsible for every gear change. When it falters, it can make driving stressful and unsafe. I’ve seen countless minivans like the Terraza come into the shop with what owners feared was a catastrophic transmission failure, only to find the root cause was this critical electronic component.
This OEM-quality T42 Transmission Control Module, part number 24243901, is the definitive solution to get your family vehicle back on the road with confidence. We take the guesswork and high dealership costs out of the equation by pre-programming the module to your vehicle’s specific VIN. This ensures it arrives ready for a direct, plug-and-play installation, restoring the smooth, predictable performance you depend on for daily driving and family trips.
A Technician’s Notebook
A customer brought in their ’07 Terraza, explaining it would intermittently refuse to shift out of 3rd gear—a classic limp mode symptom. They were worried about needing a full transmission rebuild, a quote they’d received for over $3,000. My first step was a scan, which pulled a P0752 (Shift Solenoid ‘A’ Stuck On) code. While this can point to a solenoid, my experience with these T42 modules suggested otherwise. We checked the solenoid wiring and found it was fine. The problem was the TCM itself providing faulty commands. We installed one of our VIN-programmed modules, and the problem was solved in under an hour for a fraction of the cost. The customer was relieved to avoid a massive, unnecessary repair bill.
Is Your Terraza Exhibiting These Transmission Issues?
A faulty TCM can mimic major mechanical problems. Before you consider a costly transmission replacement, check if your vehicle is showing these common symptoms. Replacing the 2006-2007 Terraza TCM is often the correct and most cost-effective fix.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in one gear (limp mode), often 2nd or 3rd.
- ✔ Active Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0752, or other solenoid-related faults.
- ✔ Failure to upshift or downshift, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
DIY Installation: A Straightforward 30-Minute Fix
You don’t need to be a professional mechanic to replace this module. With basic hand tools, you can have your Terraza running smoothly again in less than an hour. Our VIN programming makes this a true plug-and-play repair.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On the Buick Terraza and similar GM minivans (Uplander, Montana), the TCM is typically found mounted to the LH (driver’s side) strut tower in the engine bay.
- 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 your new, pre-programmed module in place of the old one and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While our module is programmed to clear most codes, it’s good practice to use a basic OBD2 scan tool to clear any remaining DTCs from the system’s memory.
Verified Fitment for Your GM Vehicle
This T42 TCM, including part number 24243901, is a direct-fit replacement for a wide range of General Motors vehicles. While this page focuses on the 2006-2007 Terraza TCM, it is also compatible with the following models. Please verify your vehicle and options below.
This part will fit these makes and models with these options:
TERRAZA 06-07 Transmission; (LH strut tower)
UPLANDER 06-09 Transmission; (LH strut tower)
MONTANA 06-09 Transmission; (LH strut tower)
ALLURE 06-09 Transmission; (lower air cleaner housing)
COBALT 06-10 Transmission; (LH strut tower)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-09 Transmission; (LH engine compartment)
G6 06-10 Transmission; (LH strut tower)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HHR 06-11 Transmission; (LH engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 06-11 Transmission; (LH engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
…and many more GM cars, trucks, and SUVs.
Frequently Asked Questions
Do I need to take my vehicle to a dealer for programming?
No. This module comes fully programmed to your vehicle’s VIN. It is a plug-and-play solution that requires no additional programming or trips to the dealership, saving you time and money.
What is a core charge?
A core charge is a deposit that is refunded when you return your old part. We do not require a core charge for this TCM, so you can keep your old part without any hassle or extra cost.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. This code is almost always accompanied by more specific transmission codes. If those specific codes point to an internal TCM failure or faulty solenoid circuit command, then yes, this module is the correct fix.
What is the warranty on this part?
We stand behind our products with a one-year warranty, ensuring you receive a reliable and durable part that is built to meet or exceed OEM standards for long-lasting performance.
Where is the TCM located on a 2007 Buick Terraza?
On the 2006-2007 Buick Terraza, the Transmission Control Module is conveniently located in the engine compartment, mounted on the driver’s side (LH) strut tower, making it easily accessible for replacement.