Is your 2006-2007 Terraza suffering from jerky shifting, getting stuck in gear, or throwing transmission codes? These are classic signs of a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make driving stressful and even unsafe. This OEM-quality T42 TCM, part number 24256960, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Over my 20 years in automotive diagnostics, I’ve seen countless GM vehicles sidelined by TCM issues. The problem often starts intermittently, making it tricky to diagnose. But when you experience sudden harsh shifts or the dreaded ‘limp mode,’ the TCM is a primary suspect. This replacement module restores the precise electronic control your transmission needs, ensuring smooth gear changes, proper torque converter lockup, and reliable performance for years to come.
From the Diagnostic Bay: A Terraza That Wouldn’t Cooperate
A customer brought in their ’07 Terraza with a frustrating complaint: it would randomly refuse to shift out of 2nd gear, especially after driving for 20 minutes. The check engine light was on, and my scan tool pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). The owner had already replaced the solenoid with no luck. After confirming the solenoid’s wiring was intact, my experience pointed directly to the 2006-2007 Terraza TCM. The internal drivers that command the solenoids had failed. We installed one of our pre-programmed modules, cleared the codes, and the van shifted perfectly on the test drive. It’s a textbook example of how a failing module can mimic a mechanical fault.
Is Your Terraza Exhibiting These Transmission Woes?
- ✔️ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔️ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔️ Harsh, delayed, or erratic shifting between gears.
- ✔️ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔️ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔️ The transmission seems to slip or fails to engage gears properly.
DIY-Friendly Installation Guide for Your Terraza
Replacing the 2006-2007 Terraza TCM is a straightforward job you can do in your driveway in under 30 minutes. For the Terraza, the module is typically located on the LH (driver’s side) strut tower.
- 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: Find the TCM on the driver’s side strut tower in the engine bay. It’s a small metal box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the heavy lifting, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes before starting the vehicle.
Verified Vehicle Compatibility
This T42 TCM is a direct fit for the 2006-2007 Terraza. It is also compatible with a wide range of other GM vehicles. Please verify your part number (24256960) or contact our team to ensure perfect fitment for your specific model.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means we flash the module with your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software before shipping. This ensures it communicates perfectly with your vehicle’s other computers right out of the box, eliminating the need for an expensive trip to the dealership for programming.
Do I need any special tools for this installation?
No special tools are required. A basic socket set to remove the mounting bolts and disconnect the battery is all you’ll need. The entire process is designed to be simple for a DIY mechanic.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or dispose of it at your convenience without the hassle of shipping it back to us.
Will this fix a P0700 code?
A P0700 is a generic code indicating the TCM has detected a fault. While this module often resolves the root cause (like a faulty solenoid driver), it’s important to check for other codes that specify the exact problem. If the TCM itself is the source of the fault, this part is the correct fix.
What kind of warranty is included?
This module comes with a one-year warranty, giving you peace of mind and confidence in the quality and reliability of your repair.