Is Your Chevrolet Uplander Shifting Erratically?
If you’re dealing with harsh shifting, delayed gear engagement, or a check engine light that points to transmission issues, you’re likely facing a failing Transmission Control Module (TCM). The TCM is the electronic brain of your 2006-2009 Chevrolet Uplander’s automatic transmission, responsible for orchestrating every gear change with precision. When it fails, drivability suffers, fuel economy drops, and you risk further damage to your transmission’s mechanical components. This replacement GM T42 TCM, service number 24243921, is the definitive solution to restore your vehicle’s performance and peace of mind.
From the Diagnostic Bay
We had a 2008 Chevy Uplander come into the shop that was stuck in what the owner called ‘granny gear.’ It wouldn’t shift past 2nd, and the transmission warning light was on. The scanner pulled a P0700 (Transmission Control System Malfunction) and a few solenoid-specific codes. After checking the wiring harness and fluid, we identified the TCM as the culprit. Instead of a costly trip to the dealer for a new module and programming, the owner opted for one of our VIN-programmed units. The installation took less than 30 minutes at its location on the LH strut tower. After reconnecting the battery and clearing the codes, the van shifted as smoothly as it did the day it left the factory. It’s a common story for these vehicles, and a pre-programmed module is the most efficient and reliable fix.
Why Choose Our Pre-Programmed 2006-2009 Uplander Transmission Module?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The biggest hurdle in replacing modern automotive electronics is the need for specialized, dealer-level programming. We eliminate that step entirely. By providing your vehicle’s VIN during checkout, we program the module with the latest GM software specific to your Uplander. This ensures that the TCM communicates flawlessly with your vehicle’s Engine Control Unit (ECU) and other systems right out of the box. No extra fees, no appointments, and no towing your vehicle to a service center. You get a plug-and-play part that restores factory performance and reliability.
Common Symptoms of a Failing GM T42 TCM
- ✔ Harsh or Erratic Shifting: Experiencing sudden, jerky shifts or banging into gear.
- ✔ Delayed Engagement: A noticeable pause when shifting from Park to Drive or Reverse.
- ✔ Stuck in Gear / Limp Mode: The transmission refuses to shift, often getting stuck in 2nd or 3rd gear to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700, P0750-P0758 (solenoid circuit faults), or U-codes indicating communication loss.
- ✔ Poor Fuel Economy: Inefficient shifting leads to the engine running at non-optimal RPMs, increasing fuel consumption.
- ✔ No Upshift or Downshift: The vehicle may fail to shift to higher gears as you accelerate or downshift when you slow down.
Installation and Compatibility
Installing your new Uplander Transmission Module is a straightforward process for a DIY mechanic. For the 2006-2009 Chevrolet Uplander, the TCM is typically located on the driver’s side (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. This module is also a direct replacement for a wide array of other GM vehicles and interchanges with part numbers such as 24252114, 24234503, 24240400, and 24256960, among others. It’s the go-to solution for 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E found in countless GM trucks, vans, and cars.
Frequently Asked Questions
What does a Transmission Control Module do on my Uplander?
The TCM acts as the central computer for your automatic transmission. It receives data from various sensors (like vehicle speed and engine RPM) to control shift solenoids, regulate hydraulic pressure, and manage torque converter lockup, ensuring smooth and efficient gear changes.
Is this module difficult to install?
For most individuals with basic mechanical skills, the installation is simple and can be completed in under 30 minutes. On the 2006-2009 Uplander, it’s easily accessible on the driver’s side strut tower. You will only need basic hand tools. Remember to disconnect the battery before you begin.
Why is VIN programming so important for this part?
VIN programming loads your vehicle’s specific software and calibration files onto the module. This ensures it communicates correctly with the engine and other vehicle systems, accounting for your specific transmission, gear ratios, and tire size. Without it, the module will not function properly.
Will this part fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other issues. However, if you are also experiencing shifting problems, replacing the TCM is the most likely solution. This module is programmed to resolve these common software-related DTCs.
Do I need to send my old module back?
No, there is no core charge for this part. You can keep your old module, which saves you the time, cost, and hassle of return shipping.