Restore Smooth Shifting to Your Saturn ION
If you’re dealing with the frustration of a transmission that won’t shift correctly, bangs into gear, or has left you stranded in limp mode, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM vehicles, including the Saturn ION, sidelined by a faulty Transmission Control Module (TCM). This isn’t just an inconvenience; it affects your car’s reliability and your safety on the road. This T42 series TCM, part number 24255280, is the definitive solution to get your 2006-2007 Saturn ION driving smoothly again.
The core of the problem often lies in the complex electronics that govern your automatic transmission. This module is the ‘brain’ behind every gear change, and when it fails, the symptoms can be alarming. We take the guesswork and high dealership costs out of the equation. Each module is professionally programmed to your vehicle’s specific VIN, ensuring it works perfectly right out of the box. This is a direct-fit replacement that restores the original factory performance and communication, eliminating those persistent error codes for good.
Case Study: The Ghost in the Transmission
A customer brought in a 2007 Saturn ION with a classic complaint: intermittent harsh shifting and a check engine light that would come and go. They had already replaced two shift solenoids based on the codes, but the problem persisted. On my diagnostic scan, I saw a P0700 (Transmission Control System Malfunction) code, which is a general flag, but the key was the communication dropouts I observed with my professional scan tool. The TCM wasn’t consistently talking to the rest of the car. These T42 modules are notorious for internal circuit board failures due to heat and vibration. We installed a VIN-programmed TCM, and the problem was solved instantly. The ‘ghost’ was the failing module itself, not the mechanical parts it controlled.
Is Your Saturn ION Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely culprit for your 2006-2007 ION TCM issues:
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- ✔ A complete failure to shift up or down.
- ✔ Noticeably poor fuel economy and a feeling of sluggishness.
- ✔ No communication with the TCM when using a scan tool.
A Straightforward Guide to Installation
For the DIY enthusiast, this is a very manageable job. You can have your Saturn ION back on the road in under an hour with basic hand tools. For the 2006-2007 ION, the TCM is located behind the driver’s side strut tower in the engine bay.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: Find the TCM mounted behind the driver-side (LH) strut tower. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, VIN-programmed module in place and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s always best practice to use a basic scan tool to clear any stored fault codes from the vehicle’s memory. Start the vehicle and enjoy your smooth-shifting transmission!
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct fit for the following vehicles. Please ensure your vehicle is on this list for guaranteed compatibility. This part is interchangeable with service numbers such as 24242391, 24234503, and 24252114.
- Saturn ION: 2006-2007 (Transmission; behind LH strut tower)
- Chevrolet Cobalt / Pontiac G5 / Pursuit: 2006-2010 (Transmission; LH strut tower)
- Chevrolet HHR: 2006-2011 (Transmission; LH engine compartment)
- Chevrolet Impala / Monte Carlo: 2006-2011 (Transmission; lower air cleaner housing)
- Pontiac G6: 2006-2010 (Transmission; LH strut tower)
- Saturn Vue: 2007-2010 (2.4L, various locations)
- …and many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to take my car to the dealership for programming?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you time and money.
Is this the correct part for my 2006-2007 ION TCM failure?
Yes, this part number 24255280 is the correct replacement for the original T42 TCM found in the 2006-2007 Saturn ION. It directly addresses common failure symptoms like harsh shifting and limp mode.
What tools do I need for installation?
Installation typically only requires basic hand tools, such as a socket set to remove the mounting bolts and a flathead screwdriver to help release the connector clips if they are stubborn.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part, so there’s no need to worry about the cost or hassle of a return shipment.
What kind of warranty is included?
This part is backed by our comprehensive one-year warranty, giving you peace of mind and confidence in your repair.