Is Your Uplander’s Transmission Giving You Headaches?
If you’re dealing with a 2006, 2007, 2008, or 2009 Chevrolet Uplander that’s shifting erratically, getting stuck in gear, or throwing transmission codes, the problem is often the Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a failing TCM can mimic serious mechanical issues, leading to frustrating and unsafe driving conditions. This replacement T42 TCM, part number YNXS, is the reliable, cost-effective solution to restore your minivan’s performance and get your family safely back on the road.
From the Diagnostic Bay: The Uplander That Didn’t Need a New Transmission
A customer brought in their ’08 Uplander, convinced they needed a full transmission rebuild. It was slamming into gear and occasionally wouldn’t shift past 2nd. The check engine light was on, and they were quoted thousands for a new transmission elsewhere. After plugging in my scan tool, I saw a classic P0700 code alongside several solenoid communication errors. Instead of tearing down the transmission, I checked the TCM. In my 20+ years of experience, I’ve seen hundreds of these T42 modules fail from heat cycles and vibration. We swapped in a VIN-programmed module, and in under an hour, the van was shifting like new. This simple fix saved the customer a massive repair bill and a lot of stress.
Is Your Uplander Showing These Symptoms?
A faulty TCM can cause a range of issues. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement:
- âś” Harsh Shifting: Abrupt, jerky, or slamming gear changes, especially between 1st and 2nd gear.
- âś” Limp Mode: The vehicle feels powerless and is stuck in a single gear (usually 2nd or 3rd) to prevent further damage.
- âś” Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dash.
- âś” Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Errors), or other communication faults.
- âś” Delayed Engagement: A noticeable pause when shifting from Park into Drive or Reverse.
- âś” Poor Fuel Economy: Inefficient shifting and torque converter lockup can cause your MPG to drop significantly.
The Plug-and-Play Advantage: Why VIN Programming Matters
This isn’t just a generic part off the shelf. We pre-program this 2006-2009 Uplander TCM to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures seamless communication between the module and your van’s other computers. You get a true plug-and-play solution that requires no expensive trip to the dealership for additional programming. It arrives ready to install, loaded with the latest GM software updates to ensure optimal shift points, torque converter strategy, and long-term reliability.
A Straightforward Guide to Installation
Replacing the TCM on your Uplander is a job most DIYers can handle in their own garage with basic hand tools. The module is conveniently located for easy access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the 2006-2009 Chevrolet Uplander, the TCM is typically found mounted on the driver’s side strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new VIN-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the system may reset on its own, it’s best practice to use a basic OBD-II scan tool to clear any stored transmission codes. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit replacement for the following vehicles, specifically programmed for your model:
- Chevrolet Uplander: 2006, 2007, 2008, 2009 (Transmission; LH strut tower)
This module also interchanges with part numbers 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, and many others across the GM family, ensuring OEM-level function for your specific vehicle.
Frequently Asked Questions
Do I need to send you my VIN?
Yes. To ensure 100% plug-and-play functionality, we require your vehicle’s 17-digit VIN at checkout. This allows us to program the module specifically for your Uplander’s factory settings.
Is this a difficult part to install myself?
Not at all. For the 2006-2009 Uplander, the TCM is located on the driver’s side strut tower, making it one of the easier modules to access. With basic tools, most people can complete the job in under 30 minutes.
Will this fix a P0700 check engine light code?
In many cases, yes. A P0700 code indicates a general fault in the transmission control system. If the root cause is a failing TCM, this replacement module will resolve the issue and allow the code to be cleared.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or recycle it locally without the hassle of shipping it back to us.