Restore Smooth, Reliable Shifting to Your Saturn ION
Is your 2006-2007 Saturn ION struggling with harsh shifts, getting stuck in gear, or throwing transmission-related check engine lights? These are classic signs of a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make your car unpredictable and frustrating to drive. This T42 Transmission Control Module, part number 24239224, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair that gets you back on the road without a costly trip to the dealership.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2007 Pontiac G6—which uses the same T42 module as the ION—that came into my shop with a baffling issue. The owner complained of random, violent shifts and the car occasionally refusing to shift past 2nd gear. He’d already replaced two shift solenoids based on the codes, but the problem persisted. After hooking up my scan tool, I saw the solenoid data was dropping out intermittently. This wasn’t a mechanical failure; it was electronic. The TCM was failing internally, sending erratic signals. We installed one of our VIN-programmed T42 modules, and in less than 30 minutes, the car was shifting perfectly. It’s a textbook example of how a failing 2006-2007 ION Transmission Module can mimic a more serious internal transmission problem, making this part the first and best place to start your diagnosis.
Is Your Vehicle Showing These Symptoms?
- ✔ Harsh, jerky, or delayed gear shifts that disrupt your drive.
- ✔ The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Your scan tool shows Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid errors), or other communication codes.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
- ✔ Complete failure to shift gears or engage from Park.
A Straightforward Guide to Installation
Replacing the TCM on your Saturn ION is a job most DIYers can handle in their own driveway. For the 2006-2007 ION, you’ll find the module located in the engine compartment, tucked behind the driver’s side (LH) strut tower. The entire process should take less than half an hour.
- Safety First: Always disconnect the negative terminal from your car’s battery before starting any electronic work. This prevents short circuits and helps reset the vehicle’s computer systems.
- Locate the Module: Open the hood and find the TCM behind the driver’s side strut tower. It’s a small metal box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket. Keep the hardware safe for reinstallation.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Firmly reconnect the wiring harnesses, ensuring they click securely into position.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s always good practice to use a basic OBD2 scan tool to clear any stored fault codes from the previous module’s failure. Start the car and enjoy smooth shifting!
Verified Vehicle Compatibility
While this is the perfect solution for your 2006-2007 ION Transmission Module, this versatile T42 module also fits a wide range of other General Motors vehicles. It is a direct replacement for multiple part numbers, including 24252114, 24234503, 24230461, 24239224, and more. It is compatible with the following models:
- Saturn: ION (06-07), Vue (07-10), Aura (07-09)
- Chevrolet: Cobalt (06-10), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Malibu (06-10), Silverado, Tahoe, Suburban, Avalanche, Express Van, Colorado
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06)
- GMC: Sierra, Yukon, Savana Van, Canyon, Envoy
- Buick: LaCrosse (06-09), Allure (06-09), Lucerne (06-11), Rainier (06-07)
- And many more GM models from 2006-2014. Please verify your specific model and year in the fitment chart.
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. It’s ready for installation right out of the box, saving you time and the high cost of dealership programming.
Is this a difficult part to install myself?
Not at all. For the Saturn ION, the TCM is easily accessible in the engine bay. With basic hand tools, most people can complete the swap in under 30 minutes.
What is a core charge?
A core charge is a deposit you pay until you return your old part. We don’t require one. You can keep your old module, eliminating the hassle and expense of shipping it back.
Will this fix a P0700 trouble code?
Yes. A P0700 code is a general fault code indicating the TCM has detected a problem. Replacing a faulty TCM is often the direct fix for a P0700 and the more specific codes that accompany it.
What does this part interchange with?
This module is a direct replacement for numerous GM service numbers, including 24239224, 24242391, 24234503, 24252114, 24235754, and others, ensuring wide compatibility.