Restore Smooth, Reliable Shifting to Your Chevrolet Uplander
Is your 2006, 2007, 2008, or 2009 Chevrolet Uplander suffering from frustrating transmission problems like harsh shifts, getting stuck in gear, or a lit check engine light? A failing Transmission Control Module (TCM) is often the culprit. As a mechanic with over two decades of diagnostic experience, I’ve seen firsthand how a faulty TCM can sideline a perfectly good family vehicle. This T42 Transmission Control Module, part number 24256960, is the definitive solution to get your minivan back on the road with confidence.
This isn’t just a part; it’s a complete, ready-to-install fix. We pre-program the module to your Uplander’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures it communicates flawlessly with your vehicle’s Powertrain Control Module (PCM) and other systems right out of the box. You get to skip the expensive and time-consuming trip to the dealership for programming. For the DIYer, this means a straightforward weekend repair. For the professional technician, it means a faster, more profitable job with a happy customer.
A Technician’s Notebook: The Misleading Solenoid Code
I remember a 2008 Uplander that came into the shop with a classic P0752 code, indicating a stuck-on shift solenoid. The owner had already replaced the solenoid pack inside the transmission, but the problem persisted: delayed, hard shifts from 1st to 2nd. After confirming the new solenoid was functional, my attention turned to the TCM. On these GM front-wheel-drive platforms, the TCM is mounted on the LH strut tower, exposed to heat and vibration. Over time, the internal drivers that command the solenoids can fail. The scanner was reading a solenoid fault, but the root cause was the module itself. We installed a VIN-programmed 2006-2009 Uplander TCM, cleared the codes, and the van shifted like new. It’s a prime example of how the diagnostic trouble code can point to a symptom, not the source.
Common Signs of a Failing Uplander TCM
If you’re experiencing any of the following, your TCM is the likely cause. Replacing it can prevent further damage to your transmission.
- âś” Harsh, slamming, or erratic gear changes.
- âś” The vehicle feels stuck in one gear (often called “limp mode”).
- âś” Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750-P0758, or other transmission-related DTCs.
- âś” Failure to shift into higher gears or delayed downshifting.
- âś” A noticeable drop in fuel economy.
- âś” The gear selector indicator (P-R-N-D) on the dash may be blank or incorrect.
DIY-Friendly Installation Guide
Replacing the 2006-2009 Uplander TCM is a manageable task for most home mechanics. No special tools are needed, and it typically takes less than an hour.
- 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 TCM: On the 2006-2009 Uplander, the TCM is conveniently located in the engine bay, mounted to the driver’s side (LH) strut tower. It’s a silver metal box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely plug in the wiring harnesses, ensuring they click and lock into position.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and check for any warning lights. Take a short test drive to confirm that shifting is smooth and responsive.
Verified Vehicle Compatibility
This module is a direct-fit replacement for the following vehicles, ensuring OEM-level performance and reliability. It is interchangeable with multiple part numbers, including 24252114, 24234503, and 24256960.
- Chevrolet Uplander: 2006, 2007, 2008, 2009 (Transmission; located on LH strut tower)
- This T42 module also fits a wide range of other GM vehicles. Please use our vehicle selector tool or contact us with your VIN to confirm perfect fitment for your specific car, truck, or SUV.
Do I need to have this module programmed by a dealer?
Do I need to have this module programmed by a dealer?
No. We handle all the programming for you. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for plug-and-play installation, saving you hundreds in dealership fees.
What is the warranty on this TCM?
This transmission control module is backed by our comprehensive one-year warranty, giving you peace of mind with your purchase.
Is a core charge required for my old part?
No, there is no core charge. You can keep your old module without any hassle or need to ship it back to us.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request, meaning the TCM has detected a problem and asked the main computer to turn on the check engine light. While a faulty TCM can cause this code, it’s often accompanied by other, more specific codes. This module will resolve the issue if the TCM itself is the source of the fault.