Restore Smooth, Reliable Shifting to Your Chevrolet Uplander
Is your 2006-2009 Chevrolet Uplander suffering from harsh shifting, getting stuck in gear, or throwing transmission-related codes? You’re not alone. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). The TCM is the brain of your automatic transmission, and when it fails, it can cause a cascade of frustrating and potentially damaging issues. This replacement T42 TCM, part number 24239926, is the definitive solution to get your family’s minivan back on the road, operating as it should.
This isn’t just a part; it’s a complete, ready-to-install fix. We pre-program each module to your vehicle’s specific VIN, eliminating the need for an expensive and time-consuming trip to the dealership. This ensures perfect communication between the engine and transmission, restoring precise gear changes, proper torque converter lockup, and reliable performance. Stop guessing and start driving with confidence.
Case Study: A Tricky Diagnosis
A customer brought in their ’08 Uplander with a complaint that was baffling them. It would randomly refuse to shift out of 2nd gear, but only after driving for 20+ minutes. There were no consistent trouble codes, just a generic P0700 (Transmission Control System Malfunction) that would pop up intermittently. After checking the fluid and solenoids, which all looked fine, we focused on the TCM. In these vans, the TCM is mounted on the LH strut tower, where it’s exposed to constant engine heat and vibration. Over time, this environment can cause microscopic cracks in the circuit board, leading to heat-induced failures like this. Swapping in a VIN-programmed TCM resolved the issue instantly. The customer was back on the road the same day, without the intermittent limp mode that had been plaguing their daily commute.
Is Your Uplander Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” (usually second or third gear).
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy.
- ✔ Complete loss of communication with the transmission.
A Straightforward Guide to Installation
One of the best features of this part is its simple, DIY-friendly installation. You don’t need a professional lift or specialized equipment. For the 2006-2009 Uplander TCM, the process typically takes less than 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system’s memory.
- Locate the TCM: On the Chevrolet Uplander, the Transmission Control Module is typically mounted on the driver’s side (LH) strut tower in the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully 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. Ensure they click into place.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the vehicle and enjoy smooth shifting!
Verified Vehicle Compatibility
This module is a direct replacement for part number 24239926 and is interchangeable with a wide range of other GM service numbers. While this page focuses on the Uplander, it also fits many other vehicles. Please verify your part number or contact us with your VIN to ensure perfect fitment.
- Chevrolet Uplander (2006-2009) – Transmission; (LH strut tower)
- …and many other GM models including the Cobalt, HHR, Impala, Malibu, G6, Grand Prix, Saturn Vue, and more. See the full fitment list provided.
Frequently Asked Questions
What does “VIN Programmed” actually mean for me?
It means the module arrives ready to install right out of the box. We load it with your vehicle’s specific factory software using your VIN. This allows it to communicate perfectly with your engine and other systems, saving you a mandatory and costly programming session at a dealership.
Do I need any special tools for this installation?
No special tools are required. A basic socket set to unbolt the module and disconnect the battery terminal is all you’ll need. The entire job can be done in your driveway in under 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a failing TCM is a very common cause of this code, it can also be triggered by other transmission issues. However, if you’re also experiencing shifting problems, replacing the TCM is the most likely solution.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of shipping it back to us, simplifying your repair process.
What if I order the wrong part?
We’re here to help! We strongly recommend providing your VIN at checkout to guarantee compatibility. If you have any doubts before or after ordering, our expert support team is ready to assist you in finding the exact part you need.