Restore Crisp, Reliable Shifting to Your Pontiac G5
If you’re dealing with the frustration of a transmission that slams into gear, refuses to shift, or has your 2007-2010 Pontiac G5 stuck in limp mode, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a technician with over two decades of experience under the hood, I’ve seen countless GM vehicles, from compacts like the G5 and Cobalt to workhorse Silverado trucks, sidelined by TCM issues. The good news is that you don’t need an expensive trip to the dealership for a complicated repair. This T42 TCM, corresponding to part number 24234503, is the definitive, straightforward solution.
This isn’t just a replacement part; it’s a complete fix. We handle the most critical step for you by pre-programming the module to your vehicle’s specific VIN. This ensures that when it arrives, it’s ready for a true plug-and-play installation. It will communicate seamlessly with your vehicle’s engine computer and other systems, restoring the precise shift logic, torque converter control, and fuel efficiency your car had from the factory. Stop guessing and start driving with confidence again.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Pontiac G6 (which uses the same T42 module as the G5) with a complaint of intermittent, harsh 1-2 shifts and a persistent Check Engine Light. Their local shop had already replaced two shift solenoids based on the codes, but the problem remained. When I scanned it, I saw the classic P0700 (Transmission Control System Malfunction) and a history of solenoid circuit codes. Experience has taught me that when multiple, seemingly random transmission codes appear, the issue is often not the individual components, but the brain controlling them. We installed one of our VIN-programmed TCMs. The installation at the LH strut tower took less than 20 minutes. After a quick battery disconnect to clear memory and a final scan, all codes were gone. The test drive confirmed it: shifts were smooth as silk. The customer saved hundreds on what could have been a wild goose chase replacing more internal parts.
Is Your G5 Exhibiting These Transmission Woes?
- ✔️ Harsh, banging shifts or delayed gear engagement.
- ✔️ Vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔️ The check engine light or transmission warning light is on.
- ✔️ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔️ A noticeable drop in fuel economy due to inefficient shifting.
- ✔️ Complete loss of communication with the TCM, preventing diagnostics.
DIY-Friendly Installation Guide for Your G5
Replacing the 2007-2010 G5 TCM is a job most DIYers can handle in their own driveway in under 30 minutes. The module is conveniently located and requires no special tools.
- 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 mounted on the driver’s side (LH) strut tower in the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, VIN-programmed module into place. Securely reconnect the wiring harnesses, ensuring the clips click into place.
- Final Steps: Reconnect the negative battery terminal. It’s a good practice to use a basic OBD2 scanner to confirm that no old fault codes are stored in the system. Start the vehicle and enjoy your smooth-shifting transmission!
Verified Fitment Across GM Models
While this is the perfect solution for your Pontiac G5, this T42 TCM is also the correct programmed part for a wide range of other GM vehicles. Please verify your model and location notes below. This part is interchangeable with service numbers 24242391, 24252114, and others.
- 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)
- And many more models including the Tahoe, Yukon, Savana, Express, LaCrosse, and Hummer H3.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean for my G5?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This makes it a direct, plug-and-play replacement without needing any expensive tools or a trip to the dealer for programming.
Will this fix my transmission code P0700?
Yes, in most cases. A P0700 code is a general fault indicating the TCM has detected a problem. If the TCM itself is the source of the electrical failure, replacing it with this programmed unit will resolve the P0700 and any related solenoid codes.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep your old module, which saves you the time and hassle of return shipping.
Is this part difficult to install on a 2007-2010 G5?
Not at all. The 2007-2010 G5 TCM is one of the more accessible modules. It’s located on the driver’s side strut tower and can be swapped with basic hand tools in under 30 minutes, making it an excellent DIY repair.
What if I have a different GM vehicle, like a truck?
This T42 module fits a huge range of GM cars, trucks, and SUVs from roughly 2006-2014. Just provide your VIN at checkout, and we will program it correctly for your specific vehicle, whether it’s a Pontiac G5 or a GMC Savana van.