Is Your 2006-2007 Terraza Shifting Erratically?
If you’re dealing with the frustration of a transmission that won’t shift correctly, slams into gear, or has put your van into a power-reduced ‘limp mode,’ the Transmission Control Module (TCM) is the most likely cause. In my 20+ years as a technician, I’ve seen these exact issues on countless GM vehicles. The TCM is the electronic brain of your automatic transmission, and when it fails, it can make your reliable family vehicle feel unpredictable and unsafe. This isn’t just an inconvenience; it’s a critical failure that affects performance, fuel economy, and drivability.
Real-World Diagnostics: A Technician’s Experience
“A customer’s 2007 Terraza came into the shop last month stuck in 3rd gear with a P0700 code. They were convinced they needed a costly transmission rebuild. Before tearing anything apart, we checked the basics. The fluid was clean, and the wiring looked good. We swapped in a programmed TCM, and the problem vanished instantly. It’s a common misdiagnosisโdrivers often fear the worst when it’s this external, easy-to-replace module that has failed. Always check the TCM first.”
Symptoms of a Failing Terraza TCM
A faulty module will give you clear warning signs. If you’re noticing any of the following, it’s time to consider a replacement:
- โ Unpredictable or harsh gear changes that feel like a jolt or bang.
- โ The vehicle refuses to shift out of a single gear (often 2nd or 3rd).
- โ Check Engine Light or Transmission Warning Light is on.
- โ Diagnostic Trouble Codes (DTCs) like P0700, P0750-P0758, or other solenoid-related faults are present.
- โ Delayed engagement when shifting from Park to Drive or Reverse.
- โ A noticeable drop in fuel efficiency.
The Direct Solution: A VIN-Programmed 2006-2007 Terraza Transmission Module
This T42 TCM is the definitive fix for these widespread issues. We take the guesswork and extra cost out of the repair by programming the module to your vehicle’s specific VIN before it ships. This ensures it communicates perfectly with your Terraza’s engine computer and other systems from the moment you install it.
- โ Plug & Play Installation: Because it’s pre-programmed with the latest GM software for your VIN, you can skip the expensive trip to the dealership for programming.
- โ Restored Performance: Regain the smooth, confident shifting your vehicle had when it was new. This module precisely controls shift points and torque converter lockup for optimal performance and fuel economy.
- โ OEM-Standard Quality: Built to meet or exceed original equipment specifications for a long, reliable service life. Backed by our one-year warranty for your peace of mind.
- โ No Core Charge: Keep your old part. There are no core fees or hassles with returning the old module.
Plug-and-Play Installation: A 30-Minute Job
Replacing the TCM on your Terraza is a straightforward DIY task. You’ll find the module located on the driver’s side of the engine bay, mounted to the strut tower.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: Open the hood and find the TCM on the driver’s side (LH) strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the bolts or nuts holding the module in place.
- Install the New Module: Mount the new, pre-programmed module in the same location and securely tighten the fasteners. Reconnect the electrical harnesses until they click.
- Final Steps: Reconnect the battery terminal. While not always necessary, it’s good practice to use a basic OBD2 scanner to clear any stored transmission codes after installation. Start the vehicle and enjoy restored shifting!
Part Number Compatibility
This module, service part number 24235732, is a direct replacement for a wide range of GM T42 TCMs. It is interchangeable with part numbers including: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24256960, and more. Order with confidence, knowing you’re getting the right part for the job.