Is Your Buick Terraza Shifting Erratically?
If you’re dealing with unpredictable gear changes, a check engine light that won’t go away, or your minivan suddenly going into limp mode, you’re likely facing a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for ensuring every shift is smooth, timely, and efficient. When it begins to fail, it can cause a cascade of frustrating and potentially damaging issues for your 2006-2007 Buick Terraza.
This genuine-quality T42 Transmission Control Module, part number 24240400, is the definitive solution to restore your vehicle’s performance. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN). This means it arrives at your door ready for a straightforward, plug-and-play installation, with no need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2007 Buick Terraza come in with classic transmission symptoms: harsh 1-2 shifts and occasionally getting 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 communication errors with the TCM. Instead of continuing to chase phantom solenoid issues, we identified the root cause: the original TCM was failing internally. After installing one of our VIN-programmed modules, the codes were cleared, and the van shifted perfectly on the test drive. It’s a great reminder that codes pointing to components are often caused by the controller itself.
Common Symptoms of a Failing 2006-2007 Terraza TCM
- ✔️ Harsh, delayed, or erratic gear shifting that makes driving uncomfortable.
- ✔️ The vehicle gets stuck in a single gear (often called “limp mode”) to protect the transmission.
- ✔️ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔️ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, or other solenoid-related faults.
- ✔️ A noticeable decrease in fuel economy due to inefficient shifting patterns.
- ✔️ Complete failure to shift gears, leaving you stranded.
The VIN Programming Advantage
Ordering a generic, non-programmed module from a parts store often leads to more problems. Your vehicle’s computer systems are designed to work in harmony, and a mismatched TCM can cause communication failures, incorrect shift points, and persistent error codes. Our process ensures this module is loaded with the latest GM software specific to your Terraza’s VIN. This guarantees seamless integration, optimal transmission performance, and resolves common software-related DTCs right out of the box.
Installation and Fitment
For the 2006-2007 Buick Terraza, this TCM is typically located on the LH (driver’s side) strut tower, making it accessible for a DIY repair in under 30 minutes. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. While this module is a direct fit for the Terraza, it is also compatible with a wide range of other GM vehicles that use the T42 controller for 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is an interchangeable replacement for service numbers such as 24252114, 24234503, 24243921, and more.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is a plug-and-play solution that does not require any additional dealership programming or flashing.
What information do you need from me to program it?
We only need your vehicle’s 17-digit VIN (Vehicle Identification Number) at checkout. This allows us to load the correct GM-certified software for your specific vehicle configuration.
Is this a reliable, long-term fix for my transmission issues?
Absolutely. This module is built to meet or exceed original equipment standards and addresses the common failure points of the original T42 TCMs. It is backed by our one-year warranty for your peace of mind.
Will this part fit other vehicles besides the Buick Terraza?
Yes, this T42 TCM is compatible with dozens of GM models from 2006-2014, including the Chevrolet Silverado, Tahoe, Impala; GMC Sierra, Yukon; Pontiac G6; Saturn Vue, and many others. Please verify the part number or use our vehicle fitment tool to confirm compatibility.
Is there a core charge for my old part?
No, we do not require you to send back your old TCM. There is no core charge associated with this purchase, saving you time and money.