Restore Your Saturn’s Shifting Performance
If your 2006-2007 Saturn ION is suffering from harsh shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is the most likely cause. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and ensuring smooth, efficient operation. When it fails, it can cause a cascade of frustrating and potentially damaging issues. This replacement GM T42 TCM, part number 24239926, is the definitive solution to restore your vehicle’s drivability and peace of mind.
From the Diagnostic Bay
We had a 2007 Chevy Cobalt come in with classic transmission symptoms: banging into gear and a P0752 code for Shift Solenoid ‘A’ Stuck On. The owner had already replaced the solenoid twice with no change. After a quick data scan, we noticed the command signals from the TCM were erratic and inconsistent, even when the vehicle was idle. The issue wasn’t the solenoid itself, but the module failing to control it properly. We installed a VIN-programmed T42 TCM, cleared the codes, and the car shifted perfectly on the test drive. It’s a common scenario where chasing codes leads you away from the root cause: the controller itself.
Is Your Transmission Control Module Failing?
A faulty TCM can manifest in various ways, often being misdiagnosed as an internal transmission failure. Before considering a costly transmission replacement, check if your vehicle is exhibiting any of these common symptoms. Early diagnosis can save you significant time and money.
Common Symptoms of a Faulty T42 TCM
- âś” Harsh, erratic, or delayed gear shifting.
- âś” Vehicle stuck in “limp mode,” often in 2nd or 3rd gear.
- âś” Check Engine Light or Transmission Warning Light is on.
- âś” Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0751, or other solenoid-related codes are present.
- âś” Complete failure to upshift or downshift.
- âś” Noticeable decrease in fuel economy.
- âś” The transmission seems to slip between gears.
- âś” Intermittent loss of communication with the module.
Why Choose Our Programmed 2006-2007 ION TCM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The key benefit is our professional VIN programming service. When you order, we flash the module with your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM-certified software. This ensures the TCM is perfectly calibrated for your Saturn ION’s engine, transmission, and tire size specifications right out of the box.
- Plug-and-Play Installation: Because the module arrives pre-programmed to your VIN, there is no need for an expensive trip to the dealership for programming or initialization. Simply install the part, and you’re ready to go.
- OEM-Standard Reliability: Built to meet or exceed original equipment specifications, this module provides the durability and performance you expect. It’s engineered to withstand the demanding environment of the engine bay and deliver consistent commands to your transmission.
- Wide Compatibility: While this is the ideal solution for your 2006-2007 ION TCM, this T42 module also serves as a direct replacement for a vast range of GM vehicles from 2006-2014, including popular models like the Chevrolet Silverado, GMC Sierra, Pontiac G6, and Buick LaCrosse. It interchanges with numerous part numbers, including 24252114, 24234503, and 24242391.
Simple Installation Process
Replacing the TCM is a straightforward job for a DIY mechanic. On the 2006-2007 Saturn ION, the TCM is typically located behind the driver-side strut tower in the engine compartment. The process generally takes less than 30 minutes.
- Safety First: Always disconnect the negative terminal of your vehicle’s battery before starting any electrical work.
- Locate and Remove: Identify the old TCM. Carefully disconnect the electrical connectors and unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses.
- Final Steps: Reconnect the battery. While the module is plug-and-play, it’s best practice to use a standard OBD2 scan tool to clear any stored trouble codes from the vehicle’s memory.
Frequently Asked Questions
What does VIN programming mean for my TCM?
VIN programming means we load your car’s specific identification number and corresponding factory software onto the module before shipping it. This ensures it communicates perfectly with your vehicle’s other computers, like the Engine Control Unit (ECU), for optimal shift points, fuel economy, and performance without needing dealer intervention.
Do I need to take my car to a dealer after installing this part?
No. Because this module comes fully programmed to your vehicle’s VIN, you do not need to visit a dealership or repair shop for additional programming. It is a true plug-and-play solution.
Where is the TCM located on a 2006-2007 Saturn ION?
On the Saturn ION for these model years, the Transmission Control Module is typically found in the engine bay, mounted behind the driver’s side (LH) strut tower.
Will this TCM fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the ECU to turn on the check engine light. While the P0700 itself doesn’t pinpoint the problem, it often appears alongside more specific codes that are resolved by replacing a faulty TCM. If your diagnosis points to a bad module, this part is the correct fix.
Is a core charge required for this part?
No, there is no core charge for this transmission control module. You can keep your old part without the hassle of returning it, making the replacement process simpler and more convenient.