Fix Your Saturn’s Erratic Shifting for Good
Is your 2006-2007 Saturn ION struggling with harsh shifts, getting stuck in gear, or throwing a check engine light? You’re not alone. The Transmission Control Module (TCM) is the electronic brain of your automatic transmission, and when it fails, it can cause a host of frustrating and concerning problems. As a technician with over 20 years of experience, I’ve seen countless drivers worry they need a costly transmission rebuild when the real culprit is a faulty TCM. This T42 Transmission Control Module, part number 24239926, is the definitive, reliable solution you need.
This isn’t just a replacement part; it’s a complete fix. We pre-program each module to your vehicle’s specific VIN before it ships. This means you can skip the expensive trip to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, restoring the precise, smooth shifting you remember. It’s designed to resolve common Diagnostic Trouble Codes (DTCs) right out of the box, getting you back on the road with confidence.
Case Study: A Tricky Diagnosis
A customer brought in their Saturn ION with classic ‘transmission failure’ symptoms: banging into gear and being stuck in limp mode. They’d been quoted over $2,500 for a transmission rebuild at another shop. After plugging in my scan tool, I saw a P0752 (Shift Solenoid ‘A’ Stuck On) code. While this can point to a bad solenoid, my experience with these T42 modules told me to look at the controller first. The internal drivers on these TCMs can fail from years of heat and vibration, sending faulty signals to perfectly good solenoids. We swapped in a VIN-programmed TCM, cleared the codes, and the car shifted flawlessly. A 30-minute job saved the customer thousands and fixed the root problem.
Is Your Saturn Exhibiting These Telltale Signs?
A failing TCM doesn’t always mean total failure. It often starts with intermittent issues. If you’re experiencing any of the following, it’s a strong indicator that your 2006-2007 ION TCM needs attention:
- âś” Unpredictable, harsh, or delayed gear shifts.
- âś” The vehicle feels like it’s stuck in one gear (often called “limp mode”).
- âś” An illuminated Check Engine Light or Transmission Warning Light.
- âś” Specific trouble codes stored, such as P0700, P0750, P0751, or other solenoid-related faults.
- âś” A sudden drop in fuel economy.
- âś” The transmission seems to slip between gears or fails to engage from Park.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation, perfect for a DIY-er with basic tools. For the 2006-2007 Saturn ION, the TCM is located in the engine bay, making it easily accessible.
- 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 Module: On your Saturn ION, you’ll find the TCM located in the engine compartment, typically tucked behind the driver’s side (LH) strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in place and securely fasten the bolts. Reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any old fault codes from the vehicle’s memory. Start the engine and take it for a test drive to confirm smooth operation.
Guaranteed Fitment for Your General Motors Vehicle
While this page is dedicated to the 2006-2007 ION TCM, this T42 module is a direct replacement for a wide range of GM vehicles. Please verify your part number or consult the list below. This module is interchangeable with part numbers: 24252114, 24234503, 24230461, 24234274, 24235340, and many others.
This part will fit these makes and models with these options
ION 06-07 Transmission; (behind LH strut tower)
… and many other GM models such as the Cobalt, HHR, G6, Malibu, Impala, Silverado, Tahoe, Yukon, and more. Please check the full compatibility list.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your car’s engine computer and other systems, just like the original part from the factory. No extra programming is needed.
Do I need any special tools for this installation?
No. Basic hand tools like a socket set are all you need to unbolt the old module and install the new one. The most important part is that no special diagnostic computers are required for programming.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code, meaning the TCM has detected a problem and has requested the Check Engine Light to be turned on. Often, a failing TCM is the root cause that triggers the P0700 and other specific codes. Replacing it with this module is a very common and effective fix for this scenario.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of needing to send it back to us.
What kind of warranty is included?
We stand behind our parts. This Transmission Control Module comes with a one-year warranty, giving you peace of mind and protection for your investment.