If your Pontiac G5 is struggling with harsh shifts, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing a critical component failure. As a technician with over two decades of experience, I’ve seen countless drivers frustrated by these exact symptoms, which almost always point to a faulty Transmission Control Module (TCM). This isn’t just a part; it’s the brain of your automatic transmission, and when it fails, your car’s drivability and safety are compromised.
This T42 TCM, part number 24235753, is the definitive solution. We take the guesswork and extra cost out of the repair by pre-programming it to your vehicle’s specific VIN. This means it arrives ready for a true plug-and-play installation, with no expensive trip to the dealership required for programming. It’s designed to restore the precise, smooth shifting and reliable performance you expect from your vehicle, directly addressing the root cause of common transmission issues.
From the Diagnostic Bay
I remember a 2008 Pontiac G6 that came into the shop stuck in ‘limp mode’—third gear only. The owner had already replaced two shift solenoids based on a generic code reader, but the problem persisted. After a quick scan with a professional tool, I saw the classic communication error codes between the ECM and TCM. The issue wasn’t the solenoids; the TCM itself was failing intermittently, especially when hot. We installed a VIN-programmed T42 module, and the car was shifting perfectly within 30 minutes. It’s a textbook example of why correctly diagnosing the ‘brain’ is more effective than just chasing symptom codes.
Is Your G5’s Transmission Acting Up?
A failing TCM sends clear warning signs. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Addressing it now can prevent further damage to your transmission’s mechanical components.
- ✔ Harsh, jerky, or erratic gear changes.
- ✔ The vehicle is stuck in limp mode (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Failure to upshift or downshift properly.
- ✔ A noticeable decrease in fuel economy.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation, which a confident DIYer can complete in their own driveway. For the Pontiac G5, the TCM is conveniently located, making the job even easier.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s computer systems.
- Locate the Module: On your 2007-2010 Pontiac G5, the TCM is found bolted to the driver’s side (LH) strut tower in the engine bay. It’s an accessible location that doesn’t require removing many other parts.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid damaging the clips. Then, unbolt the old module from the strut tower and remove it.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into position.
- Final Steps: Reconnect the battery terminal. While our VIN programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the previous failure. Start the car and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this listing is focused on the 2007-2010 G5 Transmission Module, it is also compatible with the following models. Please verify your specific part number or contact us for confirmation.
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06), Solstice, Torrent, Vibe
- Chevrolet: Cobalt (06-10), HHR (06-11), Impala (06-11), Malibu (06-10), Monte Carlo (06-07), Equinox, and various trucks/vans like Silverado, Tahoe, & Express.
- Saturn: Aura (07-09), Ion (06-07), Vue (07-10)
- Buick: Allure (06-09), LaCrosse (06-09), Lucerne (06-11), Rendezvous (06-07)
- And many other GMC, Cadillac, Hummer, and Saab models from 2006-2014.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your car’s other computers right out of the box, saving you a programming fee of $100-$200 at a dealership.
Do I need any special tools to install this?
No special tools are required. Basic hand tools like a socket set to unbolt the module and disconnect the battery are all you need. The entire process typically takes less than 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. While this module often resolves the underlying issue causing the P0700, you should scan for more specific P-codes (like P0750-P0758 for solenoids) to confirm the diagnosis. A failing TCM is a very common cause.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of shipping it back to us, simplifying your repair process.