Restore Smooth Shifting to Your Buick Terraza
If your 2006-2007 Buick Terraza is suffering from harsh shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. As a mechanic with over two decades of experience, I’ve seen countless GM vehicles, including family minivans like the Terraza, sidelined by these exact issues. The original T42 TCMs are prone to failure from heat and vibration, leading to frustrating and unpredictable driving behavior. This replacement module, part number 24234503, is the definitive solution to restore your vehicle’s reliability and performance.
This isn’t just a part; it’s a complete, ready-to-install fix. We pre-program the module to your Terraza’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures seamless communication with your vehicle’s Powertrain Control Module (PCM) and other onboard systems, eliminating the need for an expensive and time-consuming trip to the dealership for programming. You get a part that works perfectly right out of the box.
Case Study: A Terraza’s Shifting Nightmare
A customer brought in their ’07 Terraza, explaining that a local shop had quoted them over $3,000 for a transmission rebuild. The van was shifting violently between 1st and 2nd gear and would sometimes refuse to shift at all, triggering a P0700 code. After a quick scan and checking the live data, I suspected the TCM. Instead of a costly rebuild, we installed one of our VIN-programmed modules. The entire job took less than an hour in the bay. The result? The van shifted like new, all codes were cleared, and the customer saved thousands. It’s a classic example of how diagnosing the electronics first can prevent unnecessary mechanical repairs.
Is Your Terraza Exhibiting These Transmission Issues?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, delayed, or erratic gear changes.
- ✔ Vehicle is stuck in “limp mode” (typically 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid errors), or other transmission-related faults.
- ✔ A sudden drop in fuel economy.
- ✔ The transmission feels like it’s slipping or failing to engage gears properly.
A Straightforward Guide to Installation
Replacing the 2006-2007 Terraza TCM is a job most DIYers can handle with basic tools. For your specific vehicle, the module is conveniently located on the driver’s side, attached to the strut tower. Follow these steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the onboard systems.
- Locate the TCM: Open the hood and find the module on the left-hand (driver’s side) strut tower. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harnesses. They have locking tabs that may need to be gently pried up. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic OBD2 scanner, it’s good practice to clear any stored fault codes. Take the vehicle for a test drive to confirm that shifting is smooth and normal.
Verified Fitment for Your GM Vehicle
While this page is dedicated to the 2006-2007 Terraza TCM, this T42 module is compatible with a wide array of General Motors vehicles. It is a direct replacement for part numbers 24234503, 24242391, 24252114, and others listed in the interchange data. Please verify your vehicle in the list below or contact us with your VIN to ensure perfect compatibility.
- Buick: Terraza (06-07), Allure, LaCrosse, Lucerne, Rainier, Rendezvous
- Chevrolet: Avalanche, Cobalt, Colorado, Express, HHR, Impala, Malibu, Monte Carlo, Silverado, SSR, Suburban, Tahoe
- GMC: Canyon, Envoy, Savana, Sierra, Yukon
- Pontiac: G5, G6, Grand Prix, Pursuit
- Saturn: Aura, Ion, Vue
- Cadillac: DTS
- Hummer: H3
- Saab: 9-7X
What does ‘VIN Programmed’ actually mean?
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures the TCM works perfectly with your Terraza’s specific engine, transmission, and options, eliminating the need for dealership 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 a small flathead screwdriver to help with the connector tabs are typically all you need. The entire process usually takes less than 30 minutes.
Will this fix a P0700 trouble code?
Yes, in most cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the failure, replacing it with this pre-programmed unit will resolve the underlying issue and allow the code to be cleared.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or recycle it locally without the hassle of shipping it back to us, saving you time and money.