Fix Your Saturn’s Shifting Problems for Good
If you’re driving a 2006-2007 Saturn Ion, you know it’s a dependable car. But when the transmission starts acting up—slamming into gear, refusing to shift, or throwing a check engine light—it can be incredibly frustrating and concerning. As a technician with over two decades of experience under the hood, I’ve seen this exact scenario countless times. The culprit is often not the transmission itself, but its brain: the Transmission Control Module (TCM). This VIN-programmed T42 TCM, part number 24234274, is the direct, reliable solution to restore your vehicle’s performance and peace of mind.
This isn’t just a replacement part; it’s a complete fix. We program each module to your car’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures it communicates flawlessly with your vehicle’s engine computer and other systems right out of the box. You get to skip the expensive trip to the dealership for programming, saving you both time and hundreds of dollars. This module directly manages shift points, torque converter clutch engagement, and line pressure, correcting the very issues that have been plaguing your drive.
Is Your Saturn Ion Showing These Telltale Signs?
A failing TCM can mimic a catastrophic transmission failure. Before you budget for a major rebuild, check if your vehicle is exhibiting these common symptoms. A new 2006-2007 Ion Transmission Module is often the simple, cost-effective answer.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related faults.
- ✔ The transmission won’t upshift or downshift correctly.
- ✔ A noticeable drop in fuel economy or a transmission overheating warning.
- ✔ Complete loss of communication with the transmission.
A Technician’s Notebook: The Saturn Ion That Wouldn’t Shift
A customer brought in a 2007 Saturn Ion that was permanently stuck in 3rd gear. They were worried they needed a new transmission, a repair that would have cost them thousands. I hooked up my scan tool and immediately saw a P0700 code, which is a general transmission fault request. Digging deeper, I found codes related to shift solenoid circuit failure. While this could point to internal issues, my experience with these T42 modules told me to check the TCM first. The module is located right behind the driver-side strut tower—an easy spot to access. We swapped in a VIN-programmed module, cleared the codes, and the car was shifting perfectly on the test drive. A 20-minute repair saved the customer from a massive, unnecessary expense. This highlights why diagnosing the electronics first is so critical.
A Straightforward Guide to Installation
One of the best features of this part is its simple, DIY-friendly installation. You don’t need a lift or specialized transmission tools. For the 2006-2007 Ion Transmission Module, the process is quick and can be done in your driveway.
- Safety First: 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 TCM: On the Saturn Ion, the TCM is typically found in the engine bay, mounted behind the driver-side (LH) strut tower. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical 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 TCM into place. Securely reconnect the electrical harnesses, ensuring they click into place.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. Take it for a test drive to confirm that shifting is smooth and the warning lights are off. Any stored codes should be cleared with a basic OBD2 scanner.
Verified Fitment for Your General Motors Vehicle
While this is the correct 2006-2007 Ion Transmission Module, this T42 TCM is also compatible with a wide range of other GM vehicles. Please verify your specific model and year below. This part is interchangeable with service numbers 24242391, 24234503, 24252114, and others.
- Saturn Ion: 2006-2007 (behind LH strut tower)
- Chevrolet Cobalt: 2006-2010 (LH strut tower)
- Chevrolet HHR: 2006-2011 (LH engine compartment)
- Chevrolet Malibu: 2006-2010 (LH frame rail)
- Pontiac G5/G6: 2006-2010 (LH strut tower)
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please see the full fitment list for details.
Do I need to take this part to a dealer for programming?
Do I need to take this part to a dealer for programming?
No. This is the biggest benefit of our service. We pre-program the module to your car’s VIN before shipping it. This makes the installation plug-and-play, saving you the time, hassle, and expense of a dealership visit.
What is a VIN and where do I find it?
The VIN is your car’s 17-digit Vehicle Identification Number. You can find it on a metal plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this part difficult to install myself?
For most DIYers with basic hand tools, this is a very straightforward job. On the Saturn Ion, the module is easily accessible in the engine bay and the entire process typically takes less than 30 minutes.
What if my part number is slightly different?
This T42 module replaces many different GM part numbers. Our description includes a list of interchangeable service numbers. As long as your vehicle is on our compatibility list and you provide your VIN, we will ensure you receive the correct, programmed module for a perfect fit.
Is there a core charge for my old part?
No, there is no core charge required. You can keep your old module without the hassle of returning it, making the repair process even simpler.