Restore Flawless Shifting to Your Pontiac G6
If you’re dealing with the frustration of a transmission that won’t shift correctly, bangs into gear, or has left you stuck in limp mode, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless drivers worry that their transmission is shot, facing a repair bill in the thousands. Often, the real culprit is a faulty Transmission Control Module (TCM)—the electronic brain that manages every aspect of your automatic transmission’s performance. This T42 TCM, part number 24235340, is the definitive solution for your 2006-2010 Pontiac G6 and a wide range of other GM vehicles.
The beauty of this module lies in its simplicity. We handle the complex part for you by programming it directly to your vehicle’s VIN before it ships. This means no expensive trips to the dealership for programming, no special scan tools required for setup. It arrives ready to install, allowing you to restore your car’s drivability right in your own garage.
A Technician’s Notebook: The Misleading P0700 Code
A customer brought in their 2008 Pontiac G6 with the check engine light on and a complaint of very harsh 1-2 shifts. The car would sometimes feel like it was slipping between gears. A basic code scan pulled only a P0700, which is a generic ‘Transmission Control System Malfunction’ code. This code is just an indicator from the TCM telling the main engine computer (ECM) that a transmission-specific fault is stored. After connecting a professional scan tool, I found underlying codes for a shift solenoid circuit failure. In my experience, while the solenoid itself can fail, heat and vibration often cause internal failures in the T42 TCM that mimic solenoid issues. We swapped in a VIN-programmed TCM, cleared the codes, and the car shifted perfectly. The customer saved hundreds by not chasing a solenoid replacement that wasn’t needed.
Is Your Pontiac G6 Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, this module is likely the solution you need.
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758 (solenoid codes), or communication errors.
- ✔ Failure to upshift or downshift, leading to poor acceleration.
- ✔ Decreased fuel economy and potential for transmission overheating.
The Core Benefits of a Pre-Programmed 2006-2010 G6 Transmission Module
This isn’t just a replacement part; it’s a complete, ready-to-install fix. By precisely controlling shift points, torque converter lockup, and line pressure, this module ensures your transmission operates exactly as the manufacturer intended. It’s built to strict OEM standards for reliability and is backed by our one-year warranty, giving you confidence in your repair.
A Straightforward Guide to Installation
For the Pontiac G6, this is a job most DIYers can handle in under 30 minutes with basic tools. No need to even lift the vehicle.
- Safety First: Disconnect the negative terminal from your car battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- Locate the TCM: On your 2006-2010 G6, the Transmission Control Module is conveniently located on the driver’s side, mounted to the strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note the locking tabs to avoid damage. 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. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any lingering fault codes from the system.
Verified Vehicle Compatibility
While this is the correct part for the 2006-2010 Pontiac G6, this T42 TCM is also compatible with a vast array of General Motors vehicles. Please verify your model and the module’s location below. This part is a direct replacement for service numbers 24252114, 24234503, 24235340, and others.
Partial Fitment List:
- 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 Silverado 1500: 2007-2013 (next to battery)
- GMC Sierra 1500: 2007-2013 (next to battery)
- Saturn Aura: 2007-2009 (LH frame rail front)
- …and many more GM cars, trucks, and SUVs.
Frequently Asked Questions
What exactly does a Transmission Control Module (TCM) do?
The TCM is a computer that acts as the brain for your automatic transmission. It receives data from various sensors on the engine and vehicle, and uses that information to control when the transmission shifts gears, how firm the shifts are, and when the torque converter locks up for improved fuel efficiency.
Why does this part need my Vehicle Identification Number (VIN)?
Every GM vehicle has specific software calibrations for its transmission based on engine size, axle ratio, and tire size. By programming the module to your VIN, we ensure it has the exact factory software your G6 requires for optimal performance and compatibility, eliminating the need for a dealership visit.
Is this installation really DIY-friendly?
Absolutely. For the Pontiac G6, the module is easily accessible in the engine bay. With basic hand tools and our step-by-step guide, most people can complete the swap in under half an hour. It’s one of the easier electronic module replacements.
What if I still have a check engine light after installation?
After installation, it’s always recommended to clear any stored Diagnostic Trouble Codes (DTCs) with a scan tool. If a light persists, ensure all connectors are fully seated. If the problem continues, it may indicate a separate issue, but this programmed module will have resolved any faults related to the TCM itself.
Do I need to send my old part back? (Core Charge)
No, there is no core charge for this part. You can keep, discard, or recycle your old module without any hassle or extra fees.