Restore Smooth, Reliable Shifting to Your Pontiac G5
If you’re dealing with the frustration of a transmission that won’t shift correctly, slams into gear, or has put your 2007-2010 Pontiac G5 into limp mode, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfectly good car. This T42 TCM, part number 24239926, is the definitive solution, arriving pre-programmed to your vehicle’s VIN for a true plug-and-play repair that gets you back on the road without a mandatory trip to the dealership.
From the Diagnostic Bay: The Case of the Stubborn G5
A customer brought in a 2008 Pontiac G5 with classic symptoms: intermittent harsh 1-2 shifts and occasionally getting stuck in 3rd gear. They had already replaced a shift solenoid on a friend’s advice, but the problem persisted. A quick scan showed a P0700 (Transmission Control System Malfunction) and an intermittent solenoid circuit code. Instead of just throwing more parts at it, we looked at the data stream. We saw erratic command signals from the TCM. The root cause wasn’t the solenoid; it was the module itself failing under heat. Installing a VIN-programmed 2007-2010 G5 Transmission Module resolved all the issues instantly, saving the customer from a costly and unnecessary transmission teardown.
Is Your G5 Showing These Telltale Signs?
A failing TCM doesn’t heal itself; it only gets worse and can lead to permanent transmission damage. Watch for these common indicators:
- ✔ Abrupt, harsh, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (often called “limp mode”).
- ✔ The Check Engine Light or transmission warning light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, or other solenoid-specific codes.
- ✔ A noticeable decrease in fuel economy.
- ✔ The transmission seems to slip out of gear or fails to engage properly from a stop.
DIY Installation: A 30-Minute Fix
One of the best parts about this repair is its simplicity. For the Pontiac G5, the TCM is conveniently located and easy to access. You don’t need a vehicle lift or specialized tools. Here’s a straightforward guide to get it done:
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: On your Pontiac G5, the TCM is typically found mounted to the left-hand (driver’s side) strut tower in the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the electrical wiring harnesses. Then, unbolt the module from its mounting bracket. Keep the bolts in a safe place.
- 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 negative battery terminal. While our programming handles the critical setup, it’s always good practice to use a basic OBD2 scan tool to clear any stored fault codes from the ECU. Start the car and take it for a test drive to confirm the smooth shifting.
Verified Fitment for Your Vehicle
This module is a direct-fit replacement for a wide range of General Motors vehicles. While this page focuses on the 2007-2010 G5 Transmission Module, it is also compatible with the following models. Always confirm your part number (24239926) or vehicle fitment before ordering.
- Pontiac G5: 2007-2010 (LH strut tower)
- Chevrolet Cobalt: 2006-2010 (LH strut tower)
- Chevrolet HHR: 2006-2011 (LH engine compartment)
- Pontiac G6: 2006-2010 (LH strut tower)
- Saturn Ion: 2006-2007 (behind LH strut tower)
- And many other GM cars, trucks, and SUVs from 2006-2014. Please see the full fitment list for details.
Frequently Asked Questions
Do I need to take my car to the dealer for programming?
No. This module comes fully programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you time and the high cost of dealership programming.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a very manageable job. On the Pontiac G5, the TCM is easily accessible in the engine bay, and the entire process typically takes less than 30 minutes.
What if I install it and still have problems?
While this module fixes the vast majority of TCM-related issues, shifting problems can sometimes stem from mechanical failures inside the transmission (like a bad clutch pack or valve body). If issues persist, it’s a sign that further mechanical diagnosis is needed.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or recycle it locally without the hassle of shipping it back to us.