Tired of Your Saturn ION’s Unpredictable Shifting?
As a technician with two decades of experience under the hood, I’ve seen firsthand how a failing Transmission Control Module (TCM) can turn a reliable car into a source of daily frustration. If your 2006-2007 Saturn ION is suffering from harsh shifts, getting stuck in gear, or throwing transmission-related codes, you’ve likely pinpointed the culprit. This isn’t just an annoyance; it’s a critical component failure that compromises your vehicle’s performance and safety. The good news is, there’s a straightforward, permanent fix.
This T42 TCM, corresponding to part number 24256960, is the definitive solution. It’s not just a replacement part; it’s a complete remedy that arrives at your door pre-programmed to your vehicle’s specific VIN. This crucial step eliminates the need for expensive dealership visits and specialized programming tools. It’s designed to directly address the root cause of common electronic transmission faults, restoring the precise, smooth operation your GM vehicle was built for.
Case Study: The Ghost in the Transmission
I once had a 2007 Saturn ION in my bay with the most maddening issue. The owner complained of random, violent downshifts on the highway, but by the time he got to the shop, it would drive perfectly. No active codes, just a history of a generic P0700. We checked wiring and solenoids, but everything looked fine. On a hunch, based on seeing dozens of these T42 module failures, we swapped in a VIN-programmed unit. The problem vanished instantly. It was a classic case of internal TCM failure causing intermittent communication loss—a ghost that only a direct replacement could exorcise.
Is Your Saturn ION Showing These Telltale Signs?
A faulty TCM doesn’t hide well. If you’re experiencing any of the following, it’s time for a replacement:
- ✔ Abrupt, harsh, or delayed gear changes that make driving uncomfortable.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear.
- ✔ Your dashboard is lit up with a Check Engine Light or Transmission Warning Light.
- ✔ Scan tool reveals Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-specific faults.
- ✔ A noticeable drop in fuel economy as the transmission operates inefficiently.
- ✔ Complete failure to shift, leaving you stranded.
A Straightforward Guide to Your ION TCM Swap
One of the best parts about this solution is its simplicity. For the DIY enthusiast or professional mechanic, installing this 2006-2007 ION Transmission Control Module is a quick job that gets your car back to normal without a hefty labor bill. For the ION, the module is typically found behind the driver’s side strut tower.
- Safety First: Always disconnect the negative terminal from your car’s battery to prevent electrical shorts and reset the vehicle’s electronic systems.
- Locate the Old Module: On your 2006-2007 Saturn ION, find the TCM located behind the left-hand (driver’s side) strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs, as they can become brittle over time. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely plug in the electrical connectors until they click, ensuring a solid connection.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD-II scan tool to clear any stored fault codes from the vehicle’s memory. Start the car and enjoy the restored performance.
Verified Vehicle Compatibility
While this is the correct 2006-2007 ION Transmission Control Module, this T42 unit is also a direct-fit replacement for a wide array of other General Motors vehicles. Please verify your model and the location notes below. This part is interchangeable with service numbers including 24252114, 24234503, 24230461, 24234274, 24256960, and more.
- Saturn ION (2006-2007): Transmission; (behind LH strut tower)
- Chevrolet Cobalt (2006-2010): Transmission; (LH strut tower)
- Chevrolet HHR (2006-2011): Transmission; (LH engine compartment)
- Chevrolet Impala (2006-2011): Transmission; (lower air cleaner housing)
- Chevrolet Malibu (2006-2010): Transmission; (LH frame rail)
- Chevrolet Silverado 1500/2500 (2007-2013): Transmission; (next to battery)
- GMC Sierra 1500/2500 (2007-2013): Transmission; (next to battery)
- Pontiac G6 (2006-2010): Transmission; (LH strut tower)
- And many more GM trucks, vans, and sedans from 2006-2014.
Frequently Asked Questions
Do I need to take my car to the dealer for programming?
No. This module comes fully programmed to your vehicle’s VIN number. It is a true plug-and-play solution, saving you the time, cost, and hassle of a dealership visit.
Is this part difficult to install myself?
For most individuals with basic mechanical skills, this is a very straightforward installation. It typically requires only basic hand tools and can be completed in under 30 minutes. The location on the Saturn ION is easily accessible in the engine bay.
What is a core charge? Do I need to send my old part back?
There is no core charge for this part. You are not required to return your old, faulty module, which simplifies the process for you.
What kind of warranty is included?
This transmission control module is backed by our one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.