End Frustrating Transmission Problems in Your Saturn ION
If you’re dealing with a 2006-2007 Saturn ION that’s shifting erratically, getting stuck in gear, or throwing transmission codes, you’ve found the solution. As a technician with over two decades of experience, I’ve seen countless drivers frustrated by these exact issues. The culprit is often a failing Transmission Control Module (TCM), the electronic brain of your automatic transmission. This replacement T42 TCM, part number 24235753, is the definitive fix, arriving pre-programmed to your vehicle’s VIN for a true plug-and-play repair that gets you back on the road without a costly trip to the dealership.
Case Study: A Tricky Diagnosis
A customer brought in a 2007 Saturn ION with a complaint that stumped two other shops. The car would intermittently refuse to shift past 2nd gear, but only after it was fully warmed up. They’d already replaced a shift solenoid with no luck. When I hooked up my professional scan tool, I saw a generic P0700 code, but also intermittent communication loss with the TCM. Instead of just throwing parts at it, we monitored the data stream. We saw the TCM’s internal temperature sensor readings spike just before the shifting problem occurred. This pointed directly to an internal failure in the module itself. We installed one of our VIN-programmed TCMs, and the problem was solved permanently. It’s a classic example of how a failing module can mimic a mechanical issue.
Is Your Saturn Showing These Transmission Red Flags?
A failing TCM can cause a wide range of symptoms that can be easily misdiagnosed. If you’re experiencing any of the following, a faulty module is the likely cause:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ The Check Engine Light or a dedicated transmission warning light is illuminated.
- ✔ You have active Diagnostic Trouble Codes (DTCs) such as P0700 (Transmission Control System Malfunction), P0750, P0753, or other solenoid-related faults.
- ✔ Inconsistent or no shifting, leading to poor acceleration and decreased fuel economy.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
For the motivated DIYer or professional mechanic, replacing the 2006-2007 ION TCM is a simple job that typically takes less than 30 minutes. No specialized tools are needed.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On the 2006-2007 Saturn ION, the TCM is located in the engine bay, conveniently positioned behind the driver’s side (LH) strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in place and securely fasten the bolts. Reconnect the electrical 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 OBD-II scanner to clear any stored fault codes from the ECU. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24235753 and other interchangeable numbers. While this page focuses on the 2006-2007 ION TCM, this part also fits a wide range of other GM vehicles. Please verify your specific model below:
ION 06-07 Transmission; (behind LH strut tower)
ALLURE 06-09 Transmission; (lower air cleaner housing)
AVALANCHE 1500 07-08 Transmission; (next to battery)
AURA 07-09 Transmission; (LH frame rail front)
CANYON 08-12 Transmission; (RH rear engine compartment)
COBALT 06-10 Transmission; (LH strut tower)
COLORADO 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-09 Transmission; (LH engine compartment)
EXPRESS VANS (1500/2500/3500) 06-14 Transmission; (RH engine compartment)
G5 07-10 Transmission; (LH strut tower)
G6 06-10 Transmission; (LH strut tower)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HHR 06-11 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 06-11 Transmission; (LH engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
SIERRA & SILVERADO (1500/2500) 07-13 Transmission; (next to battery)
TAHOE & YUKON 07-09 Transmission; (next to battery)
VUE 07-10 Transmission; (engine compartment)
…and many more. Check the list or contact us to confirm.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. We pre-program the module to your vehicle’s specific VIN before shipping. It arrives ready for immediate installation, saving you hundreds in dealership fees and programming costs.
Will this fix a P0700 trouble code?
In many cases, yes. A P0700 code is a general fault request from the TCM to the main engine computer (ECU). If the TCM itself is faulty, replacing it with this programmed unit will resolve the root cause of the P0700 and any related transmission codes.
What tools are required for installation?
You’ll only need basic hand tools, such as a socket set to remove the mounting bolts and potentially a small flathead screwdriver to help release the electrical connector clips. No special diagnostic equipment is required.
Is there a core charge for my old part?
No, there is no core charge. You can keep or dispose of your old module without the hassle of returning it.
What kind of warranty is included?
This module is backed by our one-year, no-hassle warranty, giving you peace of mind and confidence in your repair.