Fix Erratic Shifting and Restore Your Pontiac’s Performance
If your 2007-2010 Pontiac G5 is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, a failing Transmission Control Module (TCM) is the likely culprit. As a mechanic with over two decades of experience, I’ve seen how a faulty TCM can make a perfectly good car feel unreliable and unsafe. This T42 Transmission Control Module, part number 24240449, is the definitive solution, arriving pre-programmed to your vehicle’s VIN. This means you can skip the expensive trip to the dealership for programming—it’s a true plug-and-play fix that restores the smooth, predictable shifting you depend on.
A Technician’s Notebook
I remember a 2008 Pontiac G5 that came into the shop with a classic case of intermittent transmission woes. The owner complained of random hard 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode), but the check engine light wasn’t always on. We checked the fluid, inspected the wiring, and couldn’t find a mechanical fault. After connecting a high-level scan tool, we saw communication dropouts from the TCM. We installed one of these VIN-programmed T42 modules, and the problem was solved instantly. The customer was thrilled to avoid a costly diagnostic chase and get their car back on the road, running perfectly.
Is Your Pontiac G5 Showing These Symptoms?
- âś” Abrupt, jerky, or delayed gear changes.
- âś” The vehicle enters a ‘limp mode,’ often stuck in a single gear.
- âś” Check Engine Light is on with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, or other solenoid-related faults.
- âś” Failure to upshift or downshift properly, leading to poor acceleration and fuel economy.
- âś” Complete loss of communication with the transmission module.
A Straightforward Guide to Your 2007-2010 G5 Transmission Module Installation
Replacing the TCM on your Pontiac G5 is a job most DIYers can handle in their own driveway in under 30 minutes. The module is conveniently located on the driver’s side strut tower, making access easy. Follow these steps for a successful installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: Open the hood and find the TCM mounted to the driver’s side (LH) strut tower. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses connected to the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. While the module is pre-programmed, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the ECU.
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 Pontiac G5, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
- Pontiac G5 (2007-2010): Transmission; (LH strut tower)
- Chevrolet Cobalt (2006-2010): Transmission; (LH strut tower)
- Chevrolet HHR (2006-2011): Transmission; (LH engine compartment)
- Chevrolet Impala (2006-2011): Transmission; (lower air cleaner housing)
- Chevrolet Silverado 1500 (2007-2013): Transmission; (next to battery)
- GMC Sierra 1500 (2007-2013): Transmission; (next to battery)
- Saturn Ion (2006-2007): Transmission; (behind LH strut tower)
- Saturn Vue (2007-2010): Transmission; 2.4L, (LH front engine compartment)
- …and many other GM cars, trucks, and SUVs from 2006-2014. This part interchanges with numbers 24252114, 24234503, 24240449, and more.
Frequently Asked Questions
Frequently Asked Questions
Do I need to take my car to the dealer after installing this part?
No. This module comes fully programmed to your car’s specific VIN. It is a true plug-and-play solution, saving you from additional dealership costs and programming fees.
What is the main benefit of VIN programming?
VIN programming ensures the module has the correct software and calibrations for your vehicle’s specific options and transmission type (e.g., 4L60E, 4L65E). This guarantees optimal shift performance, fuel efficiency, and functionality right out of the box.
Where is the TCM located on my 2009 Pontiac G5?
On the 2007-2010 Pontiac G5, the Transmission Control Module is located in the engine bay, mounted directly on the driver’s side (LH) strut tower for easy access.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission 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 P0753) to confirm the diagnosis points to the module or its circuits.
Is there a core charge for this part?
No, there is no core charge. You are not required to send your old, faulty module back, which simplifies the repair process for you.