If your 2007-2010 Pontiac G5 is struggling with harsh shifting, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make your daily drive frustrating and unreliable. This replacement T42 TCM, part number 24255280, is the definitive solution, arriving expertly programmed to your vehicle’s specific VIN. This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix that gets you back on the road with confidence.
Case Study: A Tricky Diagnosis
I remember a 2008 Pontiac G5 that came into my shop last winter. The owner was fed up. The car would randomly refuse to shift past 2nd gear, and the check engine light was on with a P0700 (Transmission Control System Malfunction) code. He’d already replaced a shift solenoid with no luck. After a quick scan and verifying power and ground at the module, we identified the internal TCM failure. Instead of a costly dealer part and programming fee, we installed one of our VIN-programmed modules. The entire job took less than 20 minutes, and after clearing the codes, the car shifted perfectly. It’s a classic example of how the right part saves time, money, and diagnostic headaches.
Is Your Pontiac G5 Exhibiting These Shifting Issues?
A failing TCM doesn’t always mean a total transmission breakdown. Often, the signs are subtle at first. Here’s what to look for:
- âś” Abrupt, jerky, or delayed gear shifts.
- âś” Vehicle stuck in “limp mode” (usually 2nd or 3rd gear).
- âś” Check Engine Light or Transmission Warning Light illuminated.
- âś” Diagnostic Trouble Codes (DTCs) stored, such as P0700, P0750, or other solenoid-related faults.
- âś” Inability to upshift or downshift properly.
- âś” A noticeable drop in fuel economy.
- âś” Intermittent loss of communication with the module.
A Straightforward Guide to Installation
Replacing the TCM on your Pontiac G5 is a job most DIYers can handle in their own driveway. For the 2007-2010 G5, the module is conveniently located. Follow these steps for a smooth installation:
- Safety First: Disconnect the negative terminal from your car’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On the Pontiac G5, the TCM is typically found mounted to the driver’s side (LH) strut tower in the engine bay.
- Disconnect and Remove: Carefully unclip the electrical connectors. Be gentle to avoid damaging the pins or clips. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in place and securely fasten the bolts. Reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While the system may reset, it’s best practice to use a basic OBD2 scan tool to clear any lingering fault codes from the vehicle’s memory. Start the car and take it for a test drive to confirm smooth shifting.
Will This Fit My Vehicle?
This T42 Transmission Control Module is a direct-fit replacement for the 2007-2010 Pontiac G5. It is also compatible with a wide range of other General Motors vehicles from 2006-2014 that use the T42 TCM, including models like the Chevrolet Cobalt, HHR, Saturn Ion, and Pontiac G6. It is an interchangeable replacement for numerous part numbers, including 24252114, 24234503, 24242391, and 24255280. Providing your VIN at checkout ensures we send a module programmed specifically for your car’s factory settings.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This is the biggest benefit we offer. We program the module to your vehicle’s VIN before shipping, so it’s ready for installation right out of the box. This saves you time and the high cost of dealership programming.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal failure), you should ensure there are no other issues, such as faulty wiring or solenoids. In my experience, a bad TCM is the most common reason for this code on these vehicles.
Where is the TCM located on my 2009 Pontiac G5?
For the 2007-2010 Pontiac G5, the Transmission Control Module is located in the engine compartment, mounted on the driver’s side (LH) strut tower.
What if I have a different GM vehicle?
This T42 module fits a huge range of GM cars, trucks, and SUVs. Please check the detailed fitment list or contact us with your vehicle information to confirm compatibility. It’s used in everything from a Chevy Silverado to a Buick LaCrosse.
Is there a core charge for my old part?
No, we do not require a core charge. You can keep your old part or recycle it locally without the hassle of shipping it back to us.