If your 2006-2010 Pontiac G6 is suffering from jerky shifting, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). This isn’t just an annoyance; it’s a critical failure that affects your car’s drivability and safety. This T42 TCM, part number YNXS, is the reliable, straightforward solution to get your G6 driving like new again.
This isn’t just a part in a box. It arrives at your door pre-programmed to your vehicle’s specific VIN. This crucial step ensures that the module communicates flawlessly with your car’s engine computer and transmission from the moment you plug it in. You get to skip the expensive and time-consuming trip to the dealership for programming, saving you both time and money. This is the fix that both professional mechanics and savvy DIYers trust for a lasting repair.
A Technician’s Notebook: The Intermittent G6 Shifting Nightmare
A customer brought in their 2008 G6 with a complaint that stumped a few other shops: intermittent, violent downshifts and occasional refusal to shift past 2nd gear. The check engine light would come on and then disappear. When I pulled the codes, I found a generic P0700 (Transmission Control System Malfunction) and a history of solenoid circuit codes. The problem was, the symptoms weren’t consistent. After checking the wiring and fluid, my experience pointed straight to the TCM. These T42 modules, when they begin to fail, can cause electrical gremlins that are incredibly frustrating to diagnose. We swapped in a VIN-programmed Pontiac G6 TCM, and the car’s shifting behavior was immediately restored. It’s a classic example of how a single electronic component can mimic a major mechanical failure.
Is Your G6 Exhibiting These Transmission Faults?
- ✔️ Harsh, slamming shifts or delayed gear engagement.
- ✔️ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear only).
- ✔️ The Check Engine Light or transmission warning light is on.
- ✔️ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- ✔️ Unpredictable upshifting or downshifting, leading to poor acceleration.
- ✔️ A noticeable drop in fuel economy or signs of the transmission overheating.
DIY Guide: Installing Your G6 TCM in Under 30 Minutes
Replacing the Pontiac G6 TCM is a job most car owners can handle with basic tools. For the G6, the module is conveniently located and easy to access.
- Safety First: Always disconnect the negative terminal from your car’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s computer systems.
- Locate the TCM: On the 2006-2010 Pontiac G6, the TCM is mounted on the driver’s side of the engine bay, right on the strut tower. You can’t miss it.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs, so be gentle. Then, unbolt the module from the strut tower.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely plug in the electrical connectors until they click.
- Final Steps: Reconnect the battery terminal. Start the car and let it idle for a few minutes. It’s a good practice to use a basic OBD2 scanner to clear any lingering fault codes from the system.
Verified Fitment for Your Vehicle
This module is a direct-fit replacement for the following vehicle, ensuring a perfect installation and restored performance. While it fits a wide range of GM vehicles, this listing is specifically for the G6.
- Pontiac G6: 2006, 2007, 2008, 2009, 2010 (Transmission; located at LH strut tower)
This part (YNXS) is also interchangeable with other service numbers, including 24252114, 24234503, 24240449, and more, guaranteeing broad compatibility.
Frequently Asked Questions About the Pontiac G6 TCM
Does this module really come programmed?
Yes. We program the module to the exact VIN you provide during checkout. This ensures it works with your car’s specific configuration right out of the box, with no dealer programming needed.
What happens if I don’t provide a VIN?
Providing your VIN is mandatory for this part. Without it, we cannot program the module, and your order cannot be processed. This step is essential for a successful repair.
Will this fix a P0700 code on my G6?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause, and replacing it will resolve the code and the underlying issue.
Is this a difficult part to install myself?
No, this is considered a beginner-friendly installation. For the Pontiac G6, the TCM is located on the driver’s side strut tower, making it very easy to access with basic hand tools. The entire process typically takes less than 30 minutes.
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 sending it back to us.