If your 2006-2009 Chevrolet Uplander is giving you trouble with harsh shifting, getting stuck in gear, or has an illuminated check engine light, you’re likely dealing with a failed Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen how a faulty TCM can make a reliable family minivan feel unsafe and unpredictable. This isn’t just an annoyance; it’s a critical component failure that affects your vehicle’s performance and fuel economy. This replacement T42 TCM, part number 24235754, is the definitive, hassle-free solution.
The biggest hurdle with TCM replacement has always been the expensive and time-consuming trip to the dealership for programming. We eliminate that step entirely. We pre-program this module to your Uplander’s specific Vehicle Identification Number (VIN) before it even ships. This ensures it communicates perfectly with your vehicle’s engine computer and other systems right out of the box. It’s a true plug-and-play fix that restores the smooth, predictable shifting you depend on.
Case Study: The Minivan That Wouldn’t Shift
A customer brought in their 2008 Uplander with classic transmission symptoms: banging into gear and occasionally refusing to shift past 2nd gear (limp mode). They were worried about a full transmission rebuild, a costly repair. After hooking up my scan tool, I saw a generic P0700 code and a few specific solenoid communication errors. Instead of jumping to conclusions, we checked the basics—fluid level and condition were fine. The issue was intermittent, a classic sign of electronic failure. We swapped in a VIN-programmed TCM, and the problem vanished instantly. The van shifted like new. It saved the customer thousands and reinforced a key diagnostic lesson: always suspect the TCM in these GM vehicles when you see erratic electronic symptoms.
Is Your Uplander Showing These Telltale Signs?
A failing TCM doesn’t always mean a dead transmission. Often, replacing this single module can solve a host of problems. Here are the most common symptoms I see in the shop:
- ✔ Harsh, slamming shifts or jerky gear engagement.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750-series solenoid codes, or U-series communication codes.
- ✔ Delayed shifting or failure to upshift/downshift properly.
- ✔ A sudden, unexplained drop in fuel efficiency.
- ✔ Complete loss of communication with the transmission.
Simple Swap: Your 2006-2009 Uplander TCM Installation Guide
You don’t need to be a master mechanic to install this part. The job is straightforward and can be completed in your driveway in under 30 minutes with basic hand tools.
- Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On the 2006-2009 Uplander, the TCM is typically found mounted on the driver’s side strut tower in the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old TCM. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and securely tighten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s always good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the engine and take a test drive to confirm smooth operation.
Verified Fitment Beyond the Uplander
This T42 TCM is a direct replacement for a wide range of General Motors vehicles, making it a versatile and reliable part for professional shops and multi-car households. It is interchangeable with part numbers 24252114, 24234503, 24235754, and more. Please verify your vehicle is on the list below for guaranteed compatibility.
- UPLANDER 06-09 Transmission; (LH strut tower)
- COBALT 06-10 Transmission; (LH strut tower)
- G5 07-10 Transmission; (LH strut tower)
- G6 06-10 Transmission; (LH strut tower)
- HHR 06-11 Transmission; (LH engine compartment)
- IMPALA 06-11 Transmission; (lower air cleaner housing)
- MALIBU 06-10 Transmission; (LH frame rail)
- MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
- MONTANA 06-09 Transmission; (LH strut tower)
- TERRAZA 06-07 Transmission; (LH strut tower)
- And many other GM cars, trucks, and SUVs.
Frequently Asked Questions
Do I need to take my van to the dealer after installation?
No. This module comes fully programmed to your vehicle’s VIN. It is a plug-and-play installation that does not require any additional programming or calibration from a dealership, saving you time and money.
What is a core charge?
A core charge is a deposit you pay until you return your old part. We do not have a core charge on this item, so you can keep your old module without any hassle or need to ship it back.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause, and replacing it will resolve the code and the underlying issue. However, you should always ensure other potential issues (like wiring or solenoids) are checked if problems persist.
Where is the TCM located on my 2007 Uplander?
For the 2006-2009 Chevrolet Uplander, the Transmission Control Module is located in the engine bay, mounted to the driver’s side (LH) strut tower. It’s easily accessible once you open the hood.
What information do you need to program the module?
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.