Is Your Saturn Ion Shifting Erratically?
If you’re dealing with harsh shifting, a check engine light that won’t go away, or your 2006-2007 Saturn Ion is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and monitoring system health. When it fails, it can cause a cascade of frustrating and potentially damaging issues, making your car unreliable and unsafe to drive.
Don’t let a faulty module sideline your vehicle. This OEM-quality T42 TCM, part number 24235753, is the definitive solution to restore your transmission’s performance. It arrives expertly programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and complex programming procedures. It’s a true plug-and-play fix designed to get you back on the road with confidence.
From the Diagnostic Bay
We had a 2007 Saturn Ion come into the shop with a classic complaint: intermittent harsh shifting and the transmission warning light flashing on and off. The owner had already replaced two shift solenoids based on some generic codes, but the problem persisted. After a quick scan, we saw the tell-tale U-codes indicating a communication loss with the TCM. Instead of throwing more parts at it, we inspected the module itself. After swapping in a VIN-programmed T42 TCM, all communication was restored, the codes cleared, and the car shifted like it just rolled off the factory floor. It’s a reminder that sometimes the issue isn’t a mechanical part, but the computer that controls it.
Symptoms of a Failing 2006-2007 Ion Transmission Module
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these signs can lead to more significant transmission damage and costly repairs down the line.
- ✔️ Harsh or Delayed Shifting: Your car may slam into gear, hesitate before shifting, or feel like it’s slipping between gears.
- ✔️ Stuck in Gear / Limp Mode: The transmission may refuse to shift out of a single gear (often 2nd or 3rd) to protect itself from further damage.
- ✔️ Warning Lights: The Check Engine Light or a dedicated transmission warning light will illuminate on your dashboard.
- ✔️ Diagnostic Trouble Codes (DTCs): You may see codes like P0700 (Transmission Control System Malfunction) or various solenoid-related codes (e.g., P0750, P0753, P0758).
- ✔️ Poor Fuel Economy: Inefficient shifting and torque converter operation caused by a bad TCM can lead to a noticeable drop in MPG.
- ✔️ No Communication: A scan tool may be unable to communicate with the transmission module, indicating a complete failure.
The Plug-and-Play Advantage: VIN Programming Included
The biggest hurdle when replacing modern electronic modules is programming. This 2006-2007 Ion Transmission Module comes with that problem already solved. We use the latest GM software updates to program the unit to your vehicle’s exact VIN before it ships. This ensures seamless integration with your car’s other systems, including the Engine Control Module (ECM) and Body Control Module (BCM). You get optimal shift points, correct torque converter strategy, and flawless performance right out of the box. No trips to the dealer, no extra fees, and no special tools required.
This module is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E and 4L65E. It is an interchangeable part for service numbers such as 24252114, 24234503, 24230461, 24235753, and many more, making it a versatile and reliable choice for your repair.
Installation is straightforward for a DIY mechanic. On the 2006-2007 Saturn Ion, the TCM is located behind the driver-side (LH) strut tower in the engine compartment. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. We recommend clearing any stored DTCs with a basic scan tool after installation is complete.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This Transmission Control Module is pre-programmed to your vehicle’s VIN before shipping. It is ready for immediate installation and requires no further programming or setup.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) to program the module correctly. Please provide your VIN at checkout to ensure a perfect match and avoid delays.
Where is the TCM located on my 2006 Saturn Ion?
On the 2006-2007 Saturn Ion, the TCM is typically found in the engine bay, located behind the driver’s side (LH) strut tower.
Is this a reliable, long-term fix for my transmission problems?
Absolutely. This module is built to meet or exceed OEM specifications and addresses the common failure points of the original units. By replacing your faulty TCM, you are installing a durable part designed to restore and maintain proper transmission function for years to come.
Do I need to return my old part (core charge)?
No, there is no core charge for this part. You can keep your old module, which saves you the time, money, and hassle of shipping a core back.