Restore Your Terraza’s Shifting Performance
Is your 2006 or 2007 Buick Terraza suffering from harsh shifting, delayed gear engagement, or a frustrating “limp mode”? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can lead to poor performance, decreased fuel economy, and dashboard warning lights. This genuine quality T42 TCM, part number 24243921, is the definitive solution to restore your vehicle’s factory performance.
From the Diagnostic Bay
We recently had a 2007 Terraza come into the shop with the check engine light on and the transmission stuck in 3rd gear. The owner had already replaced two shift solenoids based on the trouble codes, but the problem persisted. A quick scan showed a P0700 code, which is a general transmission fault request. After checking the wiring harness, we suspected the TCM itself was the culprit. Instead of sending the owner on another expensive parts chase, we installed one of our VIN-programmed T42 modules. After a 20-minute installation and clearing the codes, the van shifted perfectly through all gears. This is a common scenario where diagnosing the root cause—the TCM—saves time, money, and frustration.
Symptoms of a Failing 2006-2007 Terraza TCM
- ✔ Harsh, erratic, or delayed shifting between gears.
- ✔ The vehicle gets stuck in a single gear (limp mode) and will not shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes are present.
- ✔ A noticeable decrease in fuel efficiency due to improper gear selection.
- ✔ Intermittent loss of communication with the TCM, causing unpredictable behavior.
- ✔ Complete failure to engage gears from Park, Neutral, or Drive.
The Plug-and-Play Advantage: Pre-Programmed for Your VIN
Don’t waste time and money at the dealership for expensive programming. We handle the critical software setup for you. Before shipping, we program this module with your Terraza’s specific Vehicle Identification Number (VIN) and the latest GM software updates. This ensures that the TCM communicates flawlessly with your vehicle’s engine computer and other systems right out of the box. This plug-and-play solution eliminates the need for any additional setup, making the installation process straightforward for both DIY mechanics and professional technicians. Simply provide your VIN at checkout, and we’ll deliver a module that’s ready for immediate installation.
This module is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E and 4L65E. It is engineered to meet or exceed original equipment specifications for reliability and longevity, backed by our one-year warranty. Located on the LH strut tower in the Terraza, installation is simple and requires only basic hand tools.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, with no need for additional dealership programming or expensive scan tools.
Where is the TCM located on my 2006-2007 Buick Terraza?
On the 2006-2007 Terraza, the Transmission Control Module is typically located in the engine compartment, mounted to the driver’s side (LH) strut tower.
Will this fix my P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other transmission issues. Replacing a known-bad TCM is the most frequent fix for this code and related shifting problems.
Is this compatible with other part numbers?
Yes, this T42 TCM is a direct replacement for many service numbers, including 24252114, 24234503, 24230461, 24243901, and others listed in the product details. It covers a wide range of GM applications from 2006-2014.
Is there a core charge for my old part?
No, there is no core charge required for this part. You can keep your old module without any hassle or need to ship it back.