If you’re dealing with the frustration of a 2006-2007 Saturn ION that refuses to shift correctly, gets stuck in gear, or throws transmission-related codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless drivers replace perfectly good transmission parts when the real problem was a faulty Transmission Control Module (TCM). This T42 TCM, part number 24255280, is the definitive solution to restore your vehicle’s performance and reliability.
The TCM is the electronic brain of your automatic transmission. It processes data from various sensors to command precise gear shifts, manage torque converter lockup for fuel efficiency, and monitor the overall health of the system. When it fails, the symptoms can range from annoying to dangerous. Our modules are meticulously prepared and VIN-programmed with the latest GM software, ensuring they are a true plug-and-play fix right out of the box. You can skip the expensive trip to the dealership for programming—this module arrives ready for installation.
From the Diagnostic Bay: The Solenoid That Wasn’t Bad
A customer brought in a 2007 Saturn ION with a classic complaint: harsh 1-2 shifts and an intermittent Check Engine Light for a P0752 (Shift Solenoid ‘A’ Stuck On). He had already replaced the solenoid himself, but the problem persisted. In my shop, we see this scenario weekly. The issue wasn’t the solenoid; it was the driver circuit inside the original TCM that had failed. The module was sending a continuous signal, keeping the solenoid engaged. We installed a VIN-programmed T42 TCM, cleared the codes, and the car shifted like new. This part saved him from a costly and unnecessary transmission teardown.
Is Your Saturn ION Showing These Telltale Signs?
A failing TCM can mimic a major mechanical failure. Before you suspect the worst, check if your vehicle is exhibiting these common symptoms. A replacement 2006-2007 Saturn ION TCM is often the fix.
- âś” Harsh, erratic, or delayed gear shifts.
- âś” Vehicle is stuck in “limp mode” (usually second or third gear).
- âś” Check Engine Light or transmission warning light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0751, or other solenoid-specific codes.
- âś” Complete loss of upshifting or downshifting capabilities.
- âś” Noticeable decrease in fuel economy.
DIY Installation: A 30-Minute Fix for Your Saturn ION
One of the best features of this part is its straightforward installation, which most DIYers can complete in under half an hour with basic hand tools. On the Saturn ION, the TCM is typically easy to access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On the 2006-2007 Saturn ION, the TCM is located in the engine bay, usually behind the driver’s side (LH) strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. While the module is plug-and-play, it’s always good practice to use a basic OBD2 scan tool to clear any stored fault codes.
Verified Fitment Across the GM Family
While this is a perfect solution for the 2006-2007 Saturn ION TCM, this versatile T42 module is also compatible with a wide range of other General Motors vehicles. It is interchangeable with part numbers 24252114, 24234503, 24230461, 24234274, 24255280, and more. Please verify your part number or use our vehicle selector to confirm an exact match. Key compatible models include:
- Saturn: ION, VUE, AURA
- Chevrolet: Cobalt, HHR, Impala, Malibu, Monte Carlo, Tahoe, Silverado, Express
- Pontiac: G5, G6, Grand Prix, Pursuit
- GMC: Sierra, Yukon, Savana, Envoy, Canyon
- Buick: LaCrosse, Lucerne, Allure, Rainier
- And many more GM models from 2006-2014.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping. This makes it a true plug-and-play installation, saving you hundreds in dealership fees.
Is this a difficult part to install myself?
Not at all. For most vehicles, including the Saturn ION, it’s a simple process that takes less than 30 minutes with basic tools. The module is typically located in an accessible spot in the engine bay.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request, meaning the TCM has detected a problem and asked the main computer to turn on the Check Engine Light. Replacing a faulty TCM is a very common and effective way to resolve a P0700 code and the underlying specific codes (like for solenoids or sensors) that caused it.
What is your warranty policy?
This module is backed by our one-year warranty, covering any defects or functional issues. We stand behind the quality and reliability of our electronic components.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep or dispose of your old module without any hassle or extra fees.