Is Your Terraza’s Transmission Acting Up?
If you’re driving a 2006 or 2007 Terraza and experiencing sudden harsh shifts, a transmission that won’t shift out of gear, or a check engine light that points to transmission faults, the problem is very likely a failed Transmission Control Module (TCM). In my 20+ years of diagnosing these GM vehicles, I’ve found the T42 TCM to be a common failure point that can mimic a major mechanical problem, causing unnecessary stress for owners. The good news is that it’s often a straightforward electronic fix, not a transmission rebuild.
This module is the definitive solution, pre-programmed specifically to your vehicle’s VIN. This means it arrives ready for a plug-and-play installation, restoring the crisp, predictable shifting you expect from your minivan without a mandatory trip to the dealership for expensive programming.
Common Symptoms of a Failing Terraza TCM:
- โ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear) to protect the transmission.
- โ Abrupt, banging shifts or delayed gear engagement when accelerating.
- โ The check engine light is on with transmission-specific Diagnostic Trouble Codes (DTCs) like P0700 or solenoid codes (P0750, P0753, etc.).
- โ Complete loss of shifting capability or intermittent failure to communicate with the vehicle’s network.
- โ Poor fuel economy and a feeling of sluggish performance.
Key Features of This VIN-Programmed Module:
- โ Ready to Install: We program the module with the latest GM software using your VIN, so it communicates perfectly with your Terraza’s engine and other systems from the moment you plug it in.
- โ Restores Performance: A new TCM restores precise control over shift points, torque converter lockup, and line pressure, ensuring smooth operation and protecting your transmission from further wear.
- โ OEM-Quality Build: Built to meet or exceed original equipment standards for long-lasting reliability and performance, backed by our one-year warranty.
- โ Broad Compatibility: This module, part number 24235340, also replaces a wide range of other service numbers, including 24252114, 24234503, 24230461, 24240400, and more, ensuring a perfect match.
Expert Pro Tip from a 20-Year Technician
Before installing your new module, take a close look at the large electrical connector harness that plugs into the TCM. Over time, the pins can develop a thin layer of green or white corrosion from moisture, or a pin can get slightly bent. I always recommend using a small brush and some quality electrical contact cleaner to scrub the connector pins on the vehicle’s harness. This simple 5-minute step ensures a perfect connection and prevents a good part from being misdiagnosed as faulty.
Plug-and-Play Installation: No Dealer Visit Required
Replacing the 2006-2007 Terraza TCM is a job most DIYers can handle in under 30 minutes with basic tools. Follow these simple steps to get your vehicle back on the road:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on electronic components.
- Locate the Module: On your 2006-2007 Terraza, the TCM is found in the engine bay, mounted directly on the driver’s side (LH) strut tower. It’s easily accessible.
- Disconnect and Remove: Carefully unclip and unplug the electrical harnesses from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, VIN-programmed TCM into place and securely reconnect the electrical harnesses. You should feel them click into place.
- Final Steps: Reconnect the negative battery terminal. The module is ready to go, but it’s always a good idea to use a scan tool to clear any old fault codes from the computer’s memory. Start the engine and take a test drive to confirm the smooth shifting performance.