If your 2006-2007 Saturn Ion is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM vehicles, including the Ion, exhibit these exact issues. The T42 TCM is the electronic brain of your automatic transmission, and when it fails, it can cause a cascade of frustrating and potentially damaging problems. This isn’t just a part; it’s the solution to restore your car’s drivability and your peace of mind.
We offer a dependable, OEM-quality replacement TCM that arrives pre-programmed to your vehicle’s specific VIN. This means you can skip the expensive trip to the dealership for programming. It’s a true plug-and-play fix designed for both professional installers and determined DIYers. By replacing your faulty module, you’re not just fixing a symptom—you’re addressing the root cause of poor transmission performance and preventing further wear on your vehicle’s drivetrain.
Common Signs of a Failing T42 TCM
- ✔️ Harsh, jerky, or delayed gear shifts that make driving uncomfortable.
- ✔️ Your vehicle is stuck in “limp mode,” often locked in 2nd or 3rd gear.
- ✔️ The Check Engine Light or transmission warning light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- ✔️ Inability to upshift or downshift properly, leading to poor acceleration and terrible fuel economy.
- ✔️ Complete loss of communication with the module, resulting in a no-start or no-shift condition.
DIY Installation: Get Back on the Road Fast
- ✔ Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electrical work.
- ✔ Locate the Module: On your 2006-2007 Saturn Ion, the TCM is typically found in the engine bay, located behind the driver’s side (LH) strut tower.
- ✔ Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket. Keep track of the hardware.
- ✔ Install the New TCM: Mount the new, pre-programmed module in place and securely fasten the bolts. Reconnect the wiring harnesses, ensuring they click into place.
- ✔ Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
A Technician’s Notebook
I remember a 2007 Saturn Ion that came into the shop with a classic complaint: “It drives fine for 10 minutes, then it starts slamming into gear.” The customer had already replaced two shift solenoids with no luck. A quick scan showed a P0752 (Shift Solenoid A Stuck On) code, but my experience with these T42 modules pointed elsewhere. After monitoring live data, I saw the command signal from the TCM was erratic after it warmed up. The internal drivers were failing under heat. We installed one of our pre-programmed TCMs, and the problem was solved instantly. It’s a textbook example of how a faulty module can mimic a mechanical failure, making a proper diagnosis key.
This replacement 2006-2007 Ion TCM is built to meet or exceed original equipment specifications, ensuring reliable performance and longevity. It directly interchanges with a wide range of part numbers, including 24240400, 24252114, and 24234503, making it a versatile solution for many GM vehicles.
Verified Vehicle Compatibility
While this module is a perfect fit for the 2006-2007 Saturn Ion, it is also compatible with a wide range of other GM models. Please verify your specific part number and model for a guaranteed match. Key compatible models include:
- ✔️ Saturn Ion: 2006-2007 (Located behind LH strut tower)
- ✔️ Chevrolet Cobalt & Pontiac G5/G6: 2006-2010 (Located at LH strut tower)
- ✔️ Chevrolet HHR: 2006-2011 (Located in LH engine compartment)
- ✔️ Chevrolet Impala / Monte Carlo: 2006-2011 (Located at lower air cleaner housing)
- ✔️ GMC Sierra & Chevrolet Silverado: 2007-2013 (Located next to the battery)
- ✔️ GMC Yukon & Chevrolet Tahoe: 2007-2009 (Located next to the battery)
- ✔️ And many more GM, Buick, Cadillac, and Pontiac models.
Frequently Asked Questions about the 2006-2007 Ion TCM
Do I need to take my car to the dealer after installing this part?
No. This Transmission Control Module comes pre-programmed to your vehicle’s VIN. This eliminates the need for any additional programming or calibration at a dealership, saving you time and money.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a straightforward installation. On the Saturn Ion, it’s accessible in the engine bay and typically takes less than 30 minutes to swap out. Just remember to disconnect the battery first.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. While this module can resolve the underlying issue causing the P0700, you should scan for more specific transmission codes (e.g., P07xx) to confirm the diagnosis.
What is a core charge?
There is no core charge for this part. You are not required to send your old, faulty module back to us, which simplifies the process for you.
What kind of warranty is included?
This part is backed by our one-year warranty, giving you confidence in the quality and reliability of your repair.