Restore Smooth Shifting to Your Saturn ION
Is your 2006-2007 Saturn ION suffering from harsh shifts, delayed gear engagement, or a frustrating check engine light? These are classic signs of a failing Transmission Control Module (TCM). Over my 20 years in diagnostics, I’ve seen countless drivers worry about needing a full transmission rebuild when the real culprit was this small electronic unit. This T42 TCM, part number 24235754, is the definitive, reliable solution to get your vehicle driving like new again, without the astronomical dealership repair bill.
A Technician’s Notebook: The Saturn That Wouldn’t Shift
A customer brought in a 2007 Saturn ION that was stuck in 3rd gear—a classic limp mode scenario. The dash was lit up with a general P0700 transmission fault code, but a deeper scan showed intermittent communication loss with the TCM. The owner was convinced the transmission was shot. Before quoting a multi-thousand dollar repair, we checked the basics. The fluid was fine, and the wiring looked good. Knowing these T42 modules are a common failure point, we swapped in a VIN-programmed unit. In under an hour, all codes were cleared, and the car was shifting perfectly. It’s a textbook example of how this single part can solve what appears to be a catastrophic failure.
Is Your Saturn ION Showing These Transmission Red Flags?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2006-2007 ION TCM issues:
- ✔ Unpredictable or jarring gear changes.
- ✔ The vehicle refuses to shift out of a single gear (limp mode).
- ✔ Check Engine Light is on with codes like P0700, P0750, or other solenoid-related faults.
- ✔ Delayed response when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the transmission module.
The Smart Solution: Pre-Programmed and Ready to Install
The biggest headache with replacing electronic modules is the required trip to the dealership for expensive programming. We eliminate that step entirely. We flash this module with the latest GM software and program it directly to your vehicle’s VIN before it ships. The result is a true plug-and-play part that restores factory performance, shift points, and communication. This isn’t just a replacement; it’s a permanent fix for the underlying electronic faults that plague the original 2006-2007 ION TCM.
A Straightforward Guide to Installation
For the Saturn ION, this is a very manageable DIY job that you can complete in your own driveway in under 30 minutes. No specialized tools are required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On the 2006-2007 Saturn ION, the TCM is conveniently located in the engine bay, right behind the driver’s side (LH) strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses. You’ll hear a click when they are properly seated.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any stored fault codes.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a guaranteed fit for the following vehicles:
- Saturn ION: 2006-2007 (Located behind LH strut tower)
It is also a direct replacement for part number 24235754 and other service numbers on a wide range of GM vehicles, including:
- Chevrolet Cobalt, HHR, Impala, Malibu, Silverado
- Pontiac G5, G6, Grand Prix
- GMC Sierra, Canyon, Savana
- Buick LaCrosse, Lucerne
- And many more models from 2006-2014.
Frequently Asked Questions
What does a Transmission Control Module (TCM) do?
The TCM is the ‘brain’ of your automatic transmission. It receives data from various sensors on the engine and vehicle to control exactly when to shift gears, engage the torque converter, and regulate fluid pressure for smooth and efficient operation.
Is this module truly plug-and-play for my Saturn ION?
Yes. By providing your VIN during checkout, we program the module specifically for your vehicle’s configuration. This means it will work right out of the box with no need for a trip to the dealer for additional programming, saving you time and money.
Where is the TCM located on my 2007 Saturn ION?
On the 2006-2007 Saturn ION, you will find the TCM in the engine compartment. It is mounted behind the driver’s side (LH) strut tower, making it relatively easy to access for replacement.
Will this fix a P0700 trouble code?
In many cases, yes. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the electrical fault, replacing it with our pre-programmed unit is the direct solution to clear that code and the underlying issue.
Do I need to send my old part back?
No. We do not require a core return for this part. You can keep or dispose of your old module without any core charge or hassle, simplifying your repair process.