If your 2006-2010 Pontiac G6 is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light, you’re not just dealing with an annoyance—you’re facing a common and frustrating problem. As a technician with over two decades of experience, I’ve seen countless GM vehicles come into the bay with these exact symptoms. More often than not, the culprit is a failing Transmission Control Module (TCM). This isn’t just a part; it’s the brain of your automatic transmission, and when it malfunctions, it can make your car feel unreliable and unsafe to drive.
This T42 Transmission Control Module, corresponding to part number 24240449, is the definitive solution. We take the guesswork and high dealership costs out of the equation. Each module is expertly programmed to your vehicle’s specific VIN before it ships, ensuring it works seamlessly with your G6’s systems right out of the box. This critical step restores communication pathways and ensures your transmission receives the correct commands for smooth, predictable shifting and optimal fuel economy.
Case Study: The Ghost in the G6 Transmission
A customer brought in a 2009 Pontiac G6 with a maddeningly intermittent issue. It would drive perfectly for days, then suddenly slam into gear or refuse to shift past 2nd. They’d already replaced a shift solenoid with no luck. After hooking up my scan tool, I saw a history of lost communication codes with the TCM. The module wasn’t completely dead, but its internal electronics were failing under certain conditions. Instead of a costly diagnostic chase, we installed a VIN-programmed 2006-2010 G6 TCM. The problem vanished instantly. It’s a textbook example of how a failing module can mimic mechanical issues, making a direct replacement the most efficient repair.
Is Your Pontiac G6 Showing These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually second or third gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ The transmission refuses to upshift or downshift properly.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ Complete loss of communication with the transmission module.
Simple Steps to a Smoother Ride: Your Installation Guide
One of the best features of this module is its straightforward installation. For the Pontiac G6, the process is something a confident DIYer can handle in their driveway in under 30 minutes with basic tools.
- 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 your 2006-2010 Pontiac G6, the Transmission Control Module is typically located on the driver’s side of the engine bay, mounted to the strut tower.
- Disconnect and Remove: Carefully unclip the wiring harness connectors from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD-II scan tool to clear any stored fault codes from the ECU. Start the car and enjoy your restored, smooth-shifting transmission!
Verified Vehicle Compatibility List
While this is the correct part for the 2006-2010 G6 TCM, this versatile T42 module also fits a wide range of other General Motors vehicles. Please verify your model and location below. This module is a direct replacement for multiple service numbers including 24252114, 24234503, 24240449, and more.
- Pontiac G6: 2006-2010 (LH strut tower)
- Chevrolet Cobalt: 2006-2010 (LH strut tower)
- Chevrolet HHR: 2006-2011 (LH engine compartment)
- Chevrolet Impala: 2006-2011 (lower air cleaner housing)
- Chevrolet Malibu: 2006-2010 (LH frame rail)
- Chevrolet Silverado 1500/2500: 2007-2013 (next to battery)
- GMC Sierra 1500/2500: 2007-2013 (next to battery)
- Saturn Aura: 2007-2009 (LH frame rail front)
- Saturn Vue: 2007-2010 (LH front engine compartment)
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please check the full fitment list for your specific vehicle.
Frequently Asked Questions
Frequently Asked Questions
Do I need to take my car to a dealer for programming after installation?
Absolutely not. This module comes fully pre-programmed to your vehicle’s VIN. This makes it a true plug-and-play solution, saving you time and the high cost of dealership programming.
Where is the TCM located on my 2008 Pontiac G6?
For the 2006-2010 Pontiac G6, the TCM is conveniently located in the engine compartment, mounted to the driver’s side (LH) strut tower, making it easy to access.
Will this part fix a P0700 trouble code?
Yes. A P0700 code is a general transmission fault request from the TCM to the ECM. In many cases, replacing a faulty TCM is the correct fix for this code and the underlying specific codes it is reporting.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it at your convenience without the hassle of shipping it back.
What if the part number on my old module is slightly different?
This is very common. GM uses many different service numbers for the same part. Our module, part #24240449, is interchangeable with a long list of other numbers like 24252114, 24234503, and others listed in the description. As long as your vehicle is on the compatibility list, this part will work.