If your 2007-2010 Pontiac G5 is suffering from frustrating and unpredictable transmission behavior, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can turn a reliable daily driver into a source of constant stress. This T42 series TCM, part number 24252114, is the definitive solution to restore the crisp, smooth shifting your car had when it was new.
The TCM is the electronic brain of your automatic transmission. It processes data from various sensors to decide the exact moment to shift gears, engage the torque converter clutch, and monitor transmission health. When it starts to fail, the symptoms can be alarming—from violent gear changes to being stuck in ‘limp mode’ on the side of the road. This isn’t just an inconvenience; it’s a safety concern. Our module is the answer, providing a reliable and lasting repair without the exorbitant cost and hassle of a dealership visit.
A Technician’s Notebook
I remember a customer bringing in a 2008 Pontiac G5 with a complaint that stumped another shop. The car would intermittently refuse to shift out of 2nd gear, but only after it was fully warmed up. They had already replaced a shift solenoid, but the problem persisted. After hooking up my scan tool and monitoring live data, I noticed the TCM was dropping communication sporadically. The internal board was failing under heat. We installed one of our pre-programmed modules, and the car’s shifting was instantly corrected. It’s a classic example of how a faulty 2007-2010 G5 TCM can mimic mechanical failures, making proper diagnosis key.
Is Your Pontiac G5 Showing These Red Flags?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s time for a replacement:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (often 2nd or 3rd) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Your scan tool shows diagnostic trouble codes (DTCs) like P0700, P0750, P0755, or other solenoid-related faults.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the TCM, leading to a no-start or no-shift condition.
Your 30-Minute Path to a Smooth Ride
One of the best features of this module is its straightforward installation, perfect for the DIY enthusiast. For the Pontiac G5, the process is simple and requires basic hand tools. No need to pay for hours of shop labor.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- Locate the TCM: On your 2007-2010 Pontiac G5, the TCM is conveniently located on the driver’s side, mounted to the LH 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. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. While the module is plug-and-play, it’s good practice to use a basic scan tool to clear any stored fault codes from the previous failure. Take a test drive to confirm smooth shifting.
Verified Fitment For These GM Vehicles
This T42 TCM is a direct replacement for a wide range of General Motors vehicles, ensuring broad compatibility. While this page is focused on the 2007-2010 G5 TCM, it also fits the following models. Always verify your part number (24252114 or an interchangeable one) for a perfect match.
- Pontiac: G5 (2007-10), G6 (2006-10), Grand Prix (2006-08), Pursuit (2006)
- Chevrolet: Cobalt (2006-10), HHR (2006-11), Impala (2006-11), Malibu (2006-10), Monte Carlo (2006-07), Silverado, Tahoe, Express Van, and more.
- Saturn: Aura (2007-09), Ion (2006-07), Vue (2007-10)
- Buick: Allure (2006-09), LaCrosse (2006-09), Lucerne (2006-11)
- …and many other GM, GMC, Cadillac, Hummer, and Saab models from 2006-2014.
Frequently Asked Questions
Do I need to take my car to the dealer for programming?
Absolutely not. We handle all the programming for you before we ship. We use your vehicle’s VIN to load the latest GM-certified software, so it’s ready for immediate installation right out of the box. This saves you time and the typical $150+ programming fee at a dealership.
Will this fix a P0700 trouble code?
Yes, in many cases. A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the Check Engine Light. If the root cause is a failing TCM or a specific solenoid circuit fault stored within the TCM, replacing the module will resolve the P0700 and the underlying codes.
Is this a new or used part?
This is a high-quality, OEM-spec electronic component that has been thoroughly tested and prepared to meet or exceed original factory performance. It is backed by our one-year warranty for your peace of mind.
What is a core charge?
A core charge is a deposit that other companies charge you until you send your old part back. We don’t do that. There is no core charge on this part, so you can keep your old module without any hassle or extra cost.
How do I know if this is the right part for my car?
This module is the correct fit for the 2007-2010 G5 TCM application. You can also confirm by matching the part number 24252114 (or any of the interchangeable numbers listed) to the one on your current module. If you’re unsure, our expert support team is here to help you verify fitment.