If you’re dealing with the all-too-common headaches of a failing transmission control module (TCM) in your Pontiac G5, you know how frustrating it can be. One day it’s a harsh bang into gear, the next you’re stuck in limp mode on the side of the road. As a technician with over two decades of experience under the hood, I’ve seen these T42 modules cause more than their fair share of diagnostic mysteries. This isn’t just a part; it’s the solution to restoring the crisp, predictable shifting your car had when it was new.
This OEM-quality T42 TCM, part number 24230461, is the definitive fix for your 2007-2010 Pontiac G5. Unlike generic modules that require an expensive trip to the dealership for programming, this unit arrives at your door fully programmed to your vehicle’s specific VIN. This means no special tools, no expensive software subscriptions, and no compatibility guesswork. It’s a true plug-and-play repair that both seasoned mechanics and determined DIYers can appreciate, getting you back on the road quickly and confidently.
Case Study: A Tricky Diagnosis
I remember a 2008 Pontiac G5 that came into the shop with a complaint of intermittent, bone-jarring shifts and a check engine light that would come and go. The owner had already replaced a shift solenoid based on a code, but the problem persisted. After a quick scan, we saw a generic P0700 (Transmission Control System Malfunction) code, but no specific solenoid faults. Experience pointed directly to the TCM. These modules can develop internal fractures on the circuit board from heat cycles, causing intermittent connections that don’t always set a hard fault code. We installed one of our VIN-programmed modules, and in less than 30 minutes, the car was shifting perfectly. It’s a classic example of how replacing the brain, not just the symptom, is the key to a lasting repair.
Is Your Pontiac G5 Showing These Telltale Signs?
A faulty TCM can manifest in various ways, often being misdiagnosed. Here are the most common symptoms I’ve seen in my bay:
- ✔ Unpredictable or harsh gear shifts that slam or jerk.
- ✔ The vehicle gets stuck in one gear (often 2nd or 3rd), a condition known as “limp mode.”
- ✔ Your check engine light or transmission warning light is illuminated with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Failure to upshift or downshift, leading to poor acceleration and terrible fuel mileage.
- ✔ A complete loss of communication with the module, preventing the vehicle from starting or shifting out of Park.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation process. For the Pontiac G5, the TCM is conveniently located and easy to access.
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- Locate the Module: On your 2007-2010 G5, you’ll find the TCM mounted to the driver’s side (LH) strut tower in the engine bay. It’s a silver box with a few electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. They have locking tabs that need to be depressed. 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. You should hear a click as they lock in.
- 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. Take the car for a test drive to confirm the smooth shifting.
Verified Fitment for These GM Vehicles
While this listing is focused on the 2007-2010 G5 Transmission Module, this T42 TCM is also a direct replacement for a wide range of other General Motors vehicles. It is interchangeable with part numbers 24252114, 24234503, 24234274, and more. Please verify your part number or consult the fitment list below.
(A partial list is shown for reference. This part fits many models from 2006-2014.)
- Pontiac G5: 2007-2010 (LH strut tower)
- Chevrolet Cobalt: 2006-2010 (LH strut tower)
- Chevrolet HHR: 2006-2011 (LH engine compartment)
- Chevrolet Malibu: 2006-2010 (LH frame rail)
- Saturn Ion: 2006-2007 (Behind LH strut tower)
- Saturn Aura: 2007-2009 (LH frame rail front)
- And many more trucks, vans, and SUVs like the Silverado, Tahoe, Express, and Sierra.
Frequently Asked Questions
Frequently Asked Questions
Does this module really come programmed to my VIN?
Yes, absolutely. During checkout, you will provide your vehicle’s VIN, and we will program the module with the latest GM-certified software for your specific vehicle. This ensures it works correctly right out of the box.
Do I need to send my old TCM back (core charge)?
No, there is no core charge for this part. You can keep your old module or recycle it locally, making the process hassle-free.
What tools do I need for installation on my Pontiac G5?
Installation is very straightforward. You’ll typically only need a basic socket set to remove the mounting bolts and a flathead screwdriver to help release the connector tabs if they are stubborn. No special electronic tools are required.
What if I still have a check engine light after installation?
After disconnecting the battery, most codes should clear. However, some systems store “historical” codes. These can be easily cleared with any standard OBD2 scanner. If a code returns, it may indicate a separate issue, but this module will have resolved any TCM-related faults.
What kind of warranty is included?
This module is backed by our one-year, no-hassle warranty, giving you peace of mind and confidence in your repair.