If your 2007-2010 Saturn Vue is suffering from erratic shifting, getting stuck in gear, or has thrown a transmission-related check engine light, you’re likely dealing with a failed Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfectly good vehicle. This isn’t just an annoyance; it’s a critical component failure that affects your vehicle’s drivability, safety, and fuel economy. This T42 TCM, part number YNXS, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Is Your Saturn Vue Showing These Telltale Signs?
A failing TCM often broadcasts its issues through a series of frustrating symptoms. In my shop, these are the most common complaints that point directly to a bad module:
- âś” Harsh, slamming shifts or sudden, jerky gear changes.
- âś” The vehicle refuses to shift out of a low gear (often called “limp mode”).
- âś” Delayed engagement when shifting from Park to Drive or Reverse.
- âś” An illuminated Check Engine Light or Transmission Warning Light, often with Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- âś” Complete loss of communication with the transmission, leading to a no-shift condition.
- âś” A noticeable drop in fuel efficiency as the transmission isn’t operating at the right shift points.
From the Diagnostic Bay: The Ghost in the Machine
Case Study: A customer brought in their 2008 Saturn Vue with a baffling problem. The transmission would work perfectly for days, then suddenly start shifting hard and get stuck in 3rd gear. They had already replaced two shift solenoids at another shop with no success. After hooking up my scan tool, I noticed intermittent communication drops with the TCM. The issue wasn’t a mechanical fault inside the transmission; the module itself was failing electronically under certain temperature conditions. Replacing the old unit with a properly programmed 2007-2010 Vue Transmission Module solved the problem instantly. This is a classic scenario where chasing codes without considering the module leads to wasted time and money.
The Reliable Fix: A Pre-Programmed 2007-2010 Vue Transmission Module
What makes this part the ideal choice for both professional mechanics and DIY enthusiasts is the VIN-programming service. We take your vehicle’s VIN and flash the module with the latest GM software before it even ships. This eliminates the expensive and time-consuming trip to the dealership for programming. It arrives at your door ready to be installed, transforming a complex electronic repair into a simple bolt-in job. This module directly controls shift solenoids, torque converter clutch lockup, and line pressure, ensuring your transmission operates exactly as the manufacturer intended.
A Straightforward Guide to Your TCM Swap
You don’t need a professional lift or specialized equipment for this job. For most Saturn Vue models, the TCM is located in the engine compartment, making it easily accessible. The entire process should take 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 vehicle’s computer systems.
- Locate the Module: On the Saturn Vue, you’ll typically find the TCM in the LH front of the engine compartment. 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 Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the electrical harnesses, ensuring they click into place.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and check for smooth shifting and ensure no warning lights are present. We recommend using a basic scan tool to clear any stored historical codes after installation.
Verified Vehicle Compatibility
This T42 TCM (part YNXS) is a direct replacement for a wide range of General Motors vehicles. While this page focuses on the Saturn Vue, it is also compatible with the following models and configurations. Please verify your part number for a perfect match.
- Saturn Vue: 2007-2008 (2.4L), 2009 (2.4L, with or without hybrid), 2010
- Chevrolet: Cobalt, HHR, Impala, Malibu, Monte Carlo, Silverado, Tahoe, Express, Colorado, Avalanche
- GMC: Sierra, Yukon, Savana, Envoy, Canyon
- Buick: LaCrosse, Lucerne, Allure, Rainier, Rendezvous
- Pontiac: G5, G6, Grand Prix, Pursuit, Montana
- Cadillac: DTS
- Hummer: H3
- Saab: 9-7X
Do I need to take this module to a dealer for programming?
Do I need to take this module to a dealer for programming?
No. This is the biggest benefit of our service. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation, with no additional programming or dealer visits required.
Is this part difficult to install myself?
Not at all. For a 2007-2010 Saturn Vue, the TCM is located in the engine bay and is easily accessible with basic hand tools. The swap typically takes less than 30 minutes, making it a great DIY project.
What does ‘T42’ refer to?
T42 is the hardware platform designation used by GM for this generation of 4-speed automatic transmission control modules. It ensures compatibility across the many different vehicles that used this system.
Will this fix a P0700 trouble code?
A P0700 code simply means the TCM has requested the check engine light be turned on. The actual problem is stored as another code within the TCM. If the underlying cause is a faulty module, then yes, replacing it with this part will resolve the issue and allow the codes to be cleared.
Is there a core charge for my old part?
No. There is no core charge associated with this part. You can keep or dispose of your old module without the hassle of returning it.