Restore Smooth Shifting to Your Pontiac G5 with a Programmed T42 TCM
If you’re dealing with the headaches of a faulty transmission in your 2007-2010 Pontiac G5—like harsh shifts, getting stuck in gear, or a persistent check engine light—you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a failing Transmission Control Module (TCM). This T42 TCM, part number 24238856, is the direct, reliable solution you need. It arrives pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and getting you back on the road with confidence.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, it can mimic a catastrophic transmission failure, causing unnecessary stress and diagnostic confusion. This replacement module is engineered to meet or exceed original equipment specifications, ensuring it communicates flawlessly with your vehicle’s Powertrain Control Module (PCM) and other systems. By installing this part, you’re not just fixing a symptom; you’re addressing a common failure point with a dependable, long-term solution.
A Technician’s Notebook: The Intermittent Limp Mode Case
A few months back, a 2008 Pontiac G5 was towed to my shop. The owner was frustrated; the car would randomly get stuck in 3rd gear (limp mode) but would sometimes reset and drive fine after sitting overnight. There were no hard codes stored, just a generic P0700 (Transmission Control System Malfunction) that would pop up intermittently. We checked the fluid, wiring, and solenoids—all looked good. From experience, I knew these T42 modules could fail internally, causing heat-sensitive communication drops. We installed one of our VIN-programmed TCMs, and the problem vanished instantly. The customer saved a fortune by avoiding an unnecessary transmission rebuild, all thanks to a correct diagnosis and a reliable part.
Is Your Pontiac G5 Showing These Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2007-2010 G5 Transmission Control Module.
- ✔ Harsh, slamming, or erratic gear shifts.
- ✔ The vehicle is stuck in a single gear (often 2nd or 3rd), also known as “limp mode.”
- ✔ Check Engine Light or Transmission Warning Light is illuminated with codes like P0700, P0750-P0758 (solenoid circuits), or other transmission-related DTCs.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Complete failure to shift up or down.
- ✔ Poor fuel economy and a feeling of sluggish performance.
Straightforward DIY Installation Guide
Replacing the TCM on your Pontiac G5 is a job most DIYers can handle in under 30 minutes with basic tools. The module is conveniently located and accessible.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- 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 unplug the electrical connectors. Use a socket wrench to remove the mounting bolts holding the old module in place.
- Install the New Module: Mount your new, VIN-programmed TCM in the same location and secure it with the bolts. Reconnect the electrical connectors, ensuring they click securely into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any old fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
While this is the correct 2007-2010 G5 Transmission Control Module, it also fits a wide range of other General Motors vehicles. This part is interchangeable with service numbers 24242391, 24234503, 24252114, and others. Please verify your specific model below:
- Pontiac G5: 2007-2010 (LH strut tower)
- Chevrolet Cobalt: 2006-2010 (LH strut tower)
- Chevrolet HHR: 2006-2011 (LH engine compartment)
- Chevrolet Impala / Monte Carlo: 2006-2011 (lower air cleaner housing)
- Chevrolet Silverado / GMC Sierra 1500/2500: 2007-2013 (next to battery)
- Chevrolet Tahoe / GMC Yukon: 2007-2009 (next to battery)
- Saturn Ion: 2006-2007 (behind LH strut tower)
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please check the full fitment list or contact us with your VIN.
Why is VIN programming so important?
VIN programming ensures the module has the correct software and calibrations for your G5’s specific transmission, engine, and options. It makes the part truly plug-and-play, preventing compatibility issues and ensuring optimal shift performance and fuel economy without a trip to the dealer.
Do I need to send my old part back?
No, there is no core charge for this module. You can keep or dispose of your old part, making the process faster and more convenient for you.
What tools do I need for installation?
You’ll only need basic hand tools, such as a socket set to remove the mounting bolts and a tool to disconnect the battery terminal. No specialized diagnostic equipment is required for the installation itself.
Will this fix my P0700 check engine light code?
A P0700 code is a general fault request from the TCM to the main computer. In most cases where the TCM is the root cause of the problem, replacing it with this programmed module will resolve the underlying issue and allow the code to be cleared permanently.
What kind of warranty is included?
This module is backed by a one-year, hassle-free warranty, giving you peace of mind and protection for your investment.