Restore Crisp, Reliable Shifting to Your Pontiac G6
If you’re dealing with the frustration of a Pontiac G6 that slams into gear, refuses to shift, or is stuck in limp mode, you’re not alone. These are classic signs of a failing Transmission Control Module (TCM). Over my 20+ years in automotive diagnostics, I’ve seen countless GM vehicles, including the G6, sidelined by these exact issues. The TCM is the brain of your automatic transmission, and when it falters, it can make your car feel unpredictable and unsafe. This replacement 2006-2010 G6 TCM, part number 24256960, is the definitive solution to get your car driving smoothly again.
What makes this module the smart choice is our pre-programming service. We flash the unit with your car’s specific Vehicle Identification Number (VIN) and the latest GM software before it even ships. This means you can skip the expensive trip to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, saving you time, money, and hassle.
A Technician’s Notebook: The G6 Limp Mode Case
A customer recently brought in their 2008 Pontiac G6 with the check engine light on and the transmission stuck in 3rd gear. They were worried about a catastrophic transmission failure. A quick scan showed a P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. In my experience, when you see multiple, seemingly random solenoid codes at once, the issue is rarely the solenoids themselves. It’s often the module that controls them. We confirmed the TCM was the culprit. Instead of a multi-thousand-dollar transmission rebuild, the fix was this simple module replacement. With our pre-programmed unit, the car was back on the road in under an hour, shifting perfectly.
Is Your Pontiac G6 Showing These Transmission Warning Signs?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” and won’t shift out of a single gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0751, P0756, or other transmission-related faults are present.
- ✔ A sudden drop in fuel economy or a feeling of slipping between gears.
- ✔ Complete loss of communication with the transmission module (no-start or no-shift condition).
A Straightforward Guide to Your G6 TCM Installation
Replacing the TCM on a Pontiac G6 is a job most DIYers can handle with basic tools. The module is conveniently located and easily accessible.
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On the 2006-2010 Pontiac G6, the TCM is typically found mounted to the driver’s side strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical 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 and securely reconnect the electrical harnesses.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s always a good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Start the car and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles. While this page is focused on the 2006-2010 G6 TCM, it is also compatible with the following models. Always verify your part number (24256960 or an interchange) for a perfect match.
- 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)
- Saturn Aura: 2007-2009 (LH frame rail front)
- And many more GM models from 2006-2014.
Frequently Asked Questions
What does a Transmission Control Module (TCM) do?
The TCM is a computer that acts as the ‘brain’ for your automatic transmission. It collects data from various sensors in the vehicle and uses it to control shift points, torque converter lockup, and line pressure, ensuring optimal performance and efficiency.
Why is VIN programming so important for this part?
VIN programming loads your vehicle’s specific software and calibration files onto the module. This ensures it communicates perfectly with your car’s other computers (like the ECU) right out of the box. It eliminates the need for expensive dealership tools and procedures, making it a true plug-and-play repair.
Can I install this 2006-2010 G6 TCM myself?
Absolutely. For the Pontiac G6, the TCM is located on the driver’s side strut tower, making it one of the easier modules to access and replace. With basic hand tools and our installation guide, most DIY mechanics can complete the job in under 30 minutes.
What if my check engine light is still on after installation?
Our programming resolves the module-related faults. However, the vehicle’s main computer (ECU) may have stored ‘historical’ codes. These can be easily cleared by disconnecting the battery for 15 minutes during installation or by using a simple OBD2 scan tool after the job is done.
Is there a core charge for my old part?
No. We do not require you to send back your old, faulty module. There is no core charge, which simplifies the process for you. You can dispose of your old part without any hassle.