Restore Smooth, Reliable Shifting to Your Pontiac G5
If you’re dealing with the headaches of a faulty transmission—like harsh gear changes, getting stuck in limp mode, or a persistent check engine light—you’re not alone. As a technician with over two decades of experience, I’ve seen countless GM vehicles, including the Pontiac G5, suffer from these exact issues. The culprit is often not the transmission itself, but its electronic brain: the Transmission Control Module (TCM). This replacement T42 TCM, part number 24230461, is the definitive solution to get your 2007-2010 G5 Transmission Module functioning like new again.
The beauty of this part is that it arrives at your door completely pre-programmed to your vehicle’s specific VIN. This eliminates the most frustrating part of the repair: a mandatory, expensive trip to the dealership for programming. You get a true plug-and-play component that restores communication between your engine and transmission, ensuring precise shift points, proper torque converter lockup, and improved fuel economy. Stop guessing and start fixing with a part designed for reliability and ease of installation.
From the Diagnostic Bay
I remember a 2008 Pontiac G5 that came into the shop with a classic complaint: “It shifts hard sometimes, and yesterday it wouldn’t shift out of 2nd gear.” The owner was worried he needed a full transmission rebuild, a multi-thousand dollar job. The scanner showed a P0700 (Transmission Control System Malfunction) and a few intermittent solenoid codes. Instead of jumping to conclusions, we checked the basics: fluid level and condition were fine. The real issue, which I’ve diagnosed on hundreds of these GM platforms, was internal failure within the TCM. Heat cycles and vibrations cause the delicate circuit boards to fail over time. We installed a VIN-programmed module just like this one, and in under 30 minutes, the car was shifting perfectly. The customer saved a fortune and drove away with a reliable car.
Is Your G5 Showing These Telltale Signs?
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (limp mode) to protect the transmission.
- ✔ Check Engine Light is on with codes like P0700, P0750, or other transmission-related DTCs.
- ✔ Inability to upshift or downshift, leading to poor acceleration and performance.
- ✔ A noticeable drop in fuel efficiency as the transmission operates inefficiently.
- ✔ Complete loss of communication with the TCM, preventing the vehicle from starting or shifting out of park.
A Straightforward Guide to Installation
For the Pontiac G5, this is a very accessible repair for a DIY enthusiast. The 2007-2010 G5 Transmission Module is conveniently located and requires no special tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On the 2007-2010 Pontiac G5, the module is typically found mounted to the driver’s side (LH) strut tower in the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Press the release tabs firmly and pull straight out. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Final Steps: Reconnect the battery terminal. While our programming resolves most codes, it’s good practice to use a basic OBD2 scanner to clear any stored DTCs from the vehicle’s memory. Start the car and take it for a test drive to confirm smooth shifting.
Verified Fitment for Your Vehicle
This module is a direct replacement for part number 24230461 and other interchangeable numbers. While it is guaranteed to fit the specified models below, this listing is specifically for the 2007-2010 G5 Transmission Module. Please verify your vehicle’s compatibility.
- Pontiac G5: 2007, 2008, 2009, 2010 (Transmission; located at LH strut tower)
- Chevrolet Cobalt: 2006-2010 (Transmission; located at LH strut tower)
- Chevrolet HHR: 2006-2011 (Transmission; located at LH engine compartment)
- Saturn Ion: 2006-2007 (Transmission; located behind LH strut tower)
- And many other GM models from 2006-2014. Please check the full compatibility list or contact us with your VIN.
Frequently Asked Questions
What does a VIN-programmed TCM mean for me?
It means the module arrives ready for installation with no extra steps. We load your car’s specific VIN and the latest GM software onto the module before shipping, so it communicates perfectly with your vehicle’s other computers right out of the box.
Do I need to take my car to a dealer after installation?
No. Our VIN programming service eliminates the need for dealership programming, saving you time and hundreds of dollars in labor fees.
Where is the TCM on a 2009 Pontiac G5?
On the 2007-2010 Pontiac G5, the Transmission Control Module is located in the engine bay, mounted to the driver’s side (LH) strut tower.
Will this fix a P0700 code on my G5?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (internal TCM failure), you should ensure there are no wiring or solenoid issues. In the vast majority of cases I’ve seen, a faulty TCM is the primary cause.
What happens if I don’t replace a failing TCM?
Continuing to drive with a faulty TCM can lead to more severe transmission damage. Erratic fluid pressure and incorrect shifting can cause excessive wear on clutches and bands, potentially turning a simple electronics repair into a costly mechanical rebuild.