Restore Your Terraza’s Shifting Performance
Is your 2006-2007 Buick Terraza suffering from harsh shifting, getting stuck in gear, or displaying a check engine light? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and monitoring overall transmission health. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage if left unaddressed.
This genuine GM T42 Transmission Control Module, part number 24240449, is the definitive solution to restore your vehicle’s factory performance. We take the guesswork and dealership hassle out of the equation by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN). This ensures that it arrives ready for a straightforward, plug-and-play installation, loaded with the latest software updates from General Motors for optimal function and reliability.
From the Diagnostic Bay
We had a 2007 Terraza come into the shop with the classic “stuck in 3rd gear” limp mode. The owner had already replaced two shift solenoids based on a generic code reader’s output, with no success. After a proper scan, we found DTC P0700, a general transmission fault request. The real culprit wasn’t a single solenoid but the TCM itself, which was sending erratic signals. Installing a VIN-programmed T42 module like this one resolved all the codes and had the van shifting perfectly in under an hour. It’s a reminder that sometimes the root cause is the controller, not the components it’s controlling.
Your Direct-Fit 2006-2007 Terraza Transmission Module Solution
Don’t let a faulty TCM dictate your driving experience. This module is engineered to meet and exceed original equipment specifications, providing a dependable and long-lasting repair. By precisely controlling the hydraulic pressure and electronic solenoids within transmissions like the 4L60E and 4L65E, this module eliminates common issues such as delayed engagement from park, erratic upshifts, and hard downshifts. It’s the key to bringing back the smooth, predictable operation you expect from your vehicle.
Symptoms of a Failing Buick Terraza TCM
- ✔ Erratic Shifting: Experiencing sudden, harsh, or delayed gear changes during acceleration or deceleration.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Limp Mode: Your vehicle refuses to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup issues can cause a noticeable drop in MPG.
- ✔ Communication Codes: Diagnostic trouble codes (DTCs) such as P0700, P0750, or other solenoid-related faults are present.
- ✔ No Start or Stalling: In some cases, a failing TCM can interfere with vehicle communication networks, leading to intermittent starting issues.
Simple Installation, Lasting Results
This module is designed for a hassle-free installation process. For the 2006-2007 Buick Terraza, the TCM is typically located on the LH strut tower. The process is simple: disconnect the vehicle’s battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Once the new module is connected and the battery is reconnected, the vehicle will recognize the new, VIN-programmed unit. We recommend using a scan tool to clear any stored historical codes after installation to complete the process. Best of all, there is no core charge, so you don’t have to worry about the cost or inconvenience of sending your old part back.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means this module is ready to install right out of the box. We use your vehicle’s VIN to load the exact software and calibrations it needs to communicate perfectly with your Terraza’s engine and other systems. This eliminates the need for an expensive trip to the dealership for programming.
Is this a difficult part to install myself?
For most DIY mechanics with basic tools, this is a straightforward job. The module is easily accessible on the LH strut tower in your Terraza. The entire process of swapping the module typically takes less than 30 minutes.
Will this module fit other GM vehicles?
Yes, this T42 TCM is compatible with a wide range of 2006-2014 GM vehicles equipped with 4-speed automatic transmissions. While this listing is specific to the Terraza, it also fits models like the Chevrolet Impala, GMC Sierra, Pontiac G6, and many others. It interchanges with part numbers 24252114, 24234503, and 24240449.
Do I need to return my old TCM?
No, there is no core charge or requirement to return your old part. You can keep it or dispose of it at your convenience, making the repair process simpler and more affordable.
What kind of warranty is included?
This transmission control module comes with a one-year warranty, giving you peace of mind and confidence in the quality and durability of your repair.