If your 2006-2009 Chevrolet Uplander is suffering from jerky shifting, delayed gear engagement, or has suddenly gone into limp mode, the culprit is often a failing Transmission Control Module (TCM). As a family minivan, the Uplander’s reliability is non-negotiable. This VIN-programmed T42 TCM is the definitive solution to restore the smooth, predictable performance your vehicle had when it left the factory, ensuring your family’s safety and your peace of mind.
Over my 20 years in automotive diagnostics, I’ve seen countless GM vehicles with these exact symptoms. A faulty TCM doesn’t just make for an unpleasant drive; it puts unnecessary strain on the entire transmission, potentially leading to much more expensive mechanical failures down the road. This module is a direct-fit, OEM-quality replacement that communicates flawlessly with your vehicle’s systems, eliminating the guesswork and the need for a costly trip to the dealership.
A Technician’s Notebook: The Intermittent Uplander
A customer brought in their ’08 Uplander with a frustrating problem: most of the time it drove fine, but once or twice a week, it would slam into gear or refuse to shift past 2nd. There were no consistent trouble codes, just a generic P0700 stored in memory. After checking the fluid and wiring, my experience pointed straight to the TCM. Heat soak and internal component degradation were causing intermittent failures. We installed one of our VIN-programmed modules, and the problem was solved instantly. The customer saved hundreds compared to a dealership diagnosis and repair, and the van was back to being a dependable family hauler.
Is Your Uplander Showing These Transmission Warning Signs?
- ✔ Unpredictable, harsh, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the transmission module.
DIY-Friendly Installation Guide: A 30-Minute Fix
Replacing the 2006-2009 Uplander TCM is a straightforward job you can do at home with basic tools. Because this unit comes pre-programmed to your VIN, it’s a true plug-and-play repair.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On the Chevrolet Uplander, the TCM is typically found on the driver’s side of the engine bay, mounted to the LH strut tower. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Mount the new module in place and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. While not always necessary, using a basic OBD2 scanner to clear any old codes is good practice.
Verified Vehicle Compatibility
This T42 TCM, also known by part number YNXS, is a direct replacement for a wide range of General Motors vehicles. While this page focuses on the 2006-2009 Uplander TCM, it is also compatible with models like:
- ✔ Chevrolet Uplander (2006-2009) – Located at LH strut tower
- ✔ Chevrolet Impala (2006-2011)
- ✔ Pontiac G6 (2006-2010)
- ✔ Buick LaCrosse (2006-2009)
- ✔ Saturn Vue (2007-2010)
- ✔ And many other GM cars, trucks, and SUVs. Please verify your part number.