Restore Smooth, Reliable Shifting to Your Pontiac G5
If you’re dealing with the frustrating and often unpredictable behavior of a failing transmission, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless Pontiac G5s, Cobalts, and HHRs come into the shop with the same complaints: harsh bangs into gear, getting stuck in limp mode, or a check engine light that just won’t quit. More often than not, the culprit isn’t a costly mechanical failure inside the transmission, but a faulty Transmission Control Module (TCM)—the electronic brain that manages every shift.
This T42 TCM, part number 24239224, is the definitive solution. We take the guesswork and dealership expense out of the equation. Before we ship it, we program the module directly to your vehicle’s VIN. This ensures it communicates perfectly with your car’s engine computer and other systems right out of the box. No expensive scan tools, no appointments, just a straightforward fix that restores the crisp, predictable performance you expect from your car.
Case Study: A Tricky Diagnosis
A customer brought in their 2008 Pontiac G5 with an intermittent problem: it would occasionally refuse to shift out of 2nd gear, especially after driving for 20 minutes. They had already replaced two shift solenoids at another shop with no success. After hooking up my diagnostic scanner, I saw the classic P0700 (Transmission Control System Malfunction) code, but the solenoid codes were intermittent. Experience told me to look at the TCM. The internal circuits on these T42 modules can fail under heat, causing erratic signals. We installed one of our VIN-programmed modules, and the problem was solved permanently. The customer saved hundreds on what would have been a wild goose chase of replacing more internal parts.
Is Your Pontiac G5 Showing These Telltale Signs?
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (limp mode), making it difficult to drive.
- ✔ An illuminated Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0753, P0758, or other solenoid-related faults are present.
- ✔ Complete loss of communication with the transmission module.
- ✔ Poor acceleration and a noticeable drop in fuel economy.
A Straightforward Guide to Installation
For the 2007-2010 G5 Transmission Module, the replacement process is one of the easier jobs you can do. You don’t need a vehicle lift or specialized tools. The module is conveniently located and accessible in the engine bay.
- Safety First: Always 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 the Pontiac G5 and Chevrolet Cobalt, the TCM is typically mounted on the driver’s side strut tower in the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. They have locking tabs, so be gentle. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed module in place and securely reconnect the wiring 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 ECU.
Verified Fitment Across GM Models
While this is a perfect fix for the Pontiac G5, this T42 TCM is compatible with a wide range of General Motors vehicles. Please verify your model and the module location noted below. This part interchanges with several numbers, including 24252114, 24234503, and 24239926.
- Pontiac G5 (07-10): Transmission; (LH strut tower)
- Chevrolet Cobalt (06-10): Transmission; (LH strut tower)
- Chevrolet HHR (06-11): Transmission; (LH engine compartment)
- Pontiac G6 (06-10): Transmission; (LH strut tower)
- Saturn Ion (06-07): Transmission; (behind LH strut tower)
- Saturn Vue (07-10): Transmission; 2.4L, (LH front engine compartment)
- Chevrolet Malibu (06-10): Transmission; (LH frame rail)
- Buick LaCrosse / Allure (06-09): Transmission; (lower air cleaner housing)
- And many more GM trucks, vans, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to do any programming myself?
No. This module arrives 100% plug-and-play. We flash it with the latest GM software and program it to your vehicle’s specific VIN before shipping. This eliminates the need for a trip to the dealership.
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, bolted to the driver’s side (LH) strut tower. It’s easily accessible once you open the hood.
Is this part number 24239224 the same as others I’ve seen?
Yes, GM uses many different service numbers for the same part. This module is a direct replacement for numbers like 24252114, 24234503, 24242391, and others listed in our description, ensuring full compatibility.
What if this doesn’t fix my problem?
While this module resolves the most common transmission electronic failures, we stand by our parts. This part comes with a one-year warranty. If you have any issues, our expert support team is here to help you diagnose the problem.
Is there a core charge?
No, there is no core charge on this module. You can keep your old part without needing to send it back, saving you time and hassle.