Restore Your Terraza’s Transmission Performance
Is your 2006-2007 Buick Terraza experiencing frustrating transmission problems like harsh shifting, getting stuck in gear, or a lit check engine light? These are classic signs of a failing Transmission Control Module (TCM). This critical component is the brain of your automatic transmission, and when it malfunctions, it can make your vehicle unreliable and unsafe to drive. This genuine quality GM T42 TCM, part number 24239926, is the definitive solution to restore your vehicle’s smooth operation and dependability.
From the Diagnostic Bay
We had a 2007 Buick Terraza come into the shop with classic ‘limp mode’ symptoms—it wouldn’t shift out of 3rd gear. The owner had already spent a small fortune replacing shift solenoids based on a generic code reading, but the problem persisted. After a quick scan, we saw the tell-tale communication error codes pointing directly to the TCM. We installed one of our VIN-programmed T42 modules, cleared the codes, and the van was shifting perfectly within 30 minutes. It’s a common scenario: mechanics often chase symptoms inside the transmission when the real culprit is the external electronic controller. This part saves time and money by addressing the root cause directly.
Common Symptoms of a Failing Terraza TCM
A faulty TCM can manifest in various ways, often being misdiagnosed as an internal transmission failure. If your vehicle is showing any of these signs, your TCM is the most likely cause:
- ✔ Erratic and Harsh Shifting: Experiencing sudden, jerky shifts between gears, or a noticeable delay when the transmission engages from park to drive or reverse.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift past 2nd or 3rd gear, a protective measure to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): You may find codes like P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Errors), or other communication-related faults.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lock-up control lead to a significant drop in gas mileage.
- ✔ No Upshift or Downshift: The transmission fails to shift to higher or lower gears as needed, leading to high RPMs or sluggish acceleration.
The Solution: A Pre-Programmed 2006-2007 Terraza TCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. Our primary benefit is the complimentary VIN programming. When you order, we flash the module with your vehicle’s specific Vehicle Identification Number and the latest GM software updates. This ensures that the TCM communicates flawlessly with your Terraza’s engine computer (ECU) and other systems right out of the box. You get to skip the expensive and time-consuming trip to the dealership for programming.
Installation and Compatibility
Installation is a straightforward process for a DIY mechanic or any professional technician. On the 2006-2007 Buick Terraza, the TCM is typically located on the driver’s side, attached to the LH strut tower in the engine compartment. Simply disconnect the negative battery terminal, 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. We recommend clearing any stored DTCs with a basic scan tool after installation for a clean reset.
This T42 TCM is also a direct replacement for a wide array of General Motors vehicles from 2006-2014 equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24230461, 24239224, and more, making it a versatile and reliable part for many models.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s specific VIN. This makes it a true plug-and-play solution, saving you the additional cost and hassle of a dealership visit.
Where is the TCM located on a 2006-2007 Buick Terraza?
On the Terraza and similar GM minivans like the Uplander and Montana, the Transmission Control Module is conveniently located in the engine bay, mounted to the driver’s side (LH) strut tower.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause that triggers a P0700, it’s essential to check for other specific codes (like solenoid or sensor codes) to confirm the TCM is the issue. In most cases of electronic failure, replacing the TCM will clear this and related codes.
Is this a new or used part?
This is a high-quality, OEM-standard component that has been thoroughly inspected and prepared to meet or exceed original factory specifications, ensuring reliable, long-term performance. It is backed by our one-year warranty.
What happens if I continue driving with a bad TCM?
Continuing to drive with a faulty TCM can lead to more severe and expensive damage. Poor shifting can cause premature wear on clutches and bands inside the transmission, and being stuck in limp mode can be a serious safety hazard in traffic. Prompt replacement is highly recommended.