If your 2007-2010 Pontiac G5 is experiencing erratic shifting, getting stuck in gear, or throwing transmission codes, the problem is very likely a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make your car feel unreliable and unsafe to drive. Over my 20+ years in the shop, I’ve seen countless GM vehicles, from compacts like the G5 and Cobalt to workhorse trucks like the Silverado, sidelined by these exact symptoms. The cause is often internal circuit failure within the original module due to heat and vibration.
This T42 TCM, service part number 24235732, is the definitive solution. We take the guesswork and high cost out of the repair by pre-programming the module to your vehicle’s specific VIN before it ships. This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix that you or your mechanic can perform quickly. By restoring precise communication between the engine and transmission, this module ensures smooth gear changes, proper torque converter operation, and reliable performance, getting you back on the road with confidence.
From the Diagnostic Bay: The Cobalt That Wouldn’t Shift
A customer brought in a 2008 Chevy Cobalt—a car that shares its platform and many components with the Pontiac G5. The complaint was intermittent harsh shifting and the car occasionally refusing to shift past 2nd gear. They had already replaced two shift solenoids based on codes, but the problem persisted. After a quick scan, I saw a P0700 (Transmission Control System Malfunction) code, which is a general flag. Instead of chasing more solenoids, I checked the TCM data stream. I noticed erratic readings that didn’t match driver input. This is a classic sign of an internal TCM failure. We installed one of our pre-programmed T42 modules. The total job took less than 25 minutes, and a test drive confirmed perfectly smooth shifts. The customer saved hundreds compared to the dealership and avoided replacing more unnecessary parts.
Is Your Pontiac G5 Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s time to consider a replacement:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in a single 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, or other solenoid-related codes.
- ✔ A noticeable decrease in fuel economy.
- ✔ The transmission seems to slip out of gear while driving.
A Straightforward Guide to Installation
Installing your new 2007-2010 G5 Transmission Control Module is a job most DIYers can handle in their own driveway. For the Pontiac G5, the TCM is typically located on the driver’s side, mounted to the strut tower.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s electronic systems.
- Locate the Old Module: Find the TCM on the driver’s side strut tower in the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical wiring harnesses. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click into place.
- 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 smooth operation.
Verified Vehicle Compatibility
This T42 Transmission Control Module 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 your vehicle and the location notes.
- Pontiac G5 (2007-2010): Transmission; (LH strut tower)
- Chevrolet Cobalt (2006-2010): Transmission; (LH strut tower)
- Chevrolet HHR (2006-2011): Transmission; (LH engine compartment)
- Saturn Ion (2006-2007): Transmission; (behind LH strut tower)
- Pontiac G6 (2006-2010): Transmission; (LH strut tower)
- And many other GM cars, trucks, and SUVs from 2006-2014. Please see the full fitment list or contact us to confirm compatibility for your vehicle.
Frequently Asked Questions
Do I need to do any programming after installation?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you a trip to the dealership.
Is this a new or used part?
This is an OEM-quality replacement part, built to meet or exceed original factory specifications for performance and reliability. It is backed by our one-year warranty.
Where is the TCM located on my 2008 Pontiac G5?
On the 2007-2010 Pontiac G5, the Transmission Control Module is conveniently located in the engine bay, mounted on the driver’s side (LH) strut tower.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause, and replacing it will resolve the P0700 code and any related specific codes (like for solenoids). However, you should ensure there are no wiring or mechanical issues first.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part without any hassle or need to return it.