Restore Smooth, Reliable Shifting to Your Pontiac G5
As a mechanic with over two decades of experience under the hood, I’ve seen countless drivers frustrated by transmission issues that seem to come out of nowhere. If your 2007-2010 Pontiac G5 is experiencing harsh shifts, getting stuck in gear, or throwing transmission-related check engine lights, the culprit is often a failing Transmission Control Module (TCM). This isn’t just an annoyance; it affects your car’s performance, fuel economy, and safety. This T42 TCM, part number 24241806, is the definitive, hassle-free solution to get your G5 running right again.
The biggest hurdle with electronic module replacement has always been the expensive and time-consuming trip to the dealership for programming. We eliminate that step entirely. We pre-program this module to your vehicle’s specific VIN before it ships, ensuring it’s ready for a true plug-and-play installation the moment it arrives. This restores factory shift points and communication protocols, directly addressing the root cause of many common powertrain diagnostic codes.
A Technician’s Notebook
I remember a 2008 Pontiac G5 that came into the shop with a classic complaint: “It drives fine for 10 minutes, then it starts slamming into gear.” The customer had already replaced a shift solenoid with no luck. A scan showed a P0750 code, but it was intermittent. After checking the wiring, we suspected the TCM. These modules, especially the T42 generation, can develop internal faults from heat cycles and vibration over the years, leading to unpredictable behavior. We swapped in a VIN-programmed module, and the problem was solved instantly. The customer was thrilled to avoid a costly diagnostic goose chase and get a permanent fix.
Is Your G5 Showing These Symptoms?
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle is stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ The Check Engine Light or a transmission warning light is on with codes like P0700 (Transmission Control System Malfunction), P0750, or other solenoid-related faults.
- ✔ A sudden drop in fuel efficiency or a feeling that the transmission is slipping.
- ✔ Complete failure to shift, either up or down, or a loss of communication with the module.
A Straightforward Guide to Installation
For the Pontiac G5, this is a repair most DIYers can handle in their own driveway in under 30 minutes. The module is easy to access, and no specialized tools are required.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On the 2007-2010 Pontiac G5, 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 unplug the electrical harnesses. They have locking tabs that need to be depressed. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While our programming resolves most issues, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the car and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24241806 and other service numbers. While this page is focused on the 2007-2010 G5 Transmission Control Module, it is also compatible with a wide range of other GM vehicles. Please verify your part number or contact us with your VIN to ensure perfect fitment.
What exactly is VIN programming?
What exactly is VIN programming?
VIN programming means we load your car’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures the TCM has the correct shift strategies and settings for your specific vehicle, making it a true plug-and-play part without needing a trip to the dealer.
Will this fix a P0700 diagnostic trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. It indicates a more specific transmission code is stored in the TCM. In many cases where the TCM itself has failed, replacing it with this programmed unit will resolve the underlying issue and clear the P0700 code.
Do I need to send my old module back?
No, there is no core charge or need to return your old part. You can keep it or dispose of it, making the process simpler and faster for you.
Is this a difficult part to install myself?
Not at all. For the Pontiac G5, the TCM is located on the driver’s side strut tower and is very accessible. With basic hand tools, the swap typically takes less than 30 minutes, making it an excellent DIY-friendly repair.