If your 2007-2009 Saturn Aura is suffering from jerky shifting, getting stuck in gear, or has an illuminated Check Engine Light, a failing Transmission Control Module (TCM) is the most likely culprit. As a mechanic with over two decades of experience, I’ve seen these T42 modules cause countless headaches for GM owners. The constant communication errors between the TCM and the transmission’s solenoids lead to the frustrating and unpredictable performance you’re likely experiencing. This isn’t just an annoyance—it’s a reliability issue that can leave you stranded.
This is a direct-replacement, OEM-quality T42 TCM, part number 24243901, designed to permanently resolve these common transmission problems. The most significant benefit we offer is our expert VIN programming service. Before we ship the module, we flash it with the latest GM software specific to your Saturn Aura’s VIN. This means it arrives at your door ready for a true plug-and-play installation, eliminating the need for expensive and time-consuming dealership programming. You get a reliable fix that restores the smooth, decisive shifting your car had when it was new.
From the Diagnostic Bay: The Case of the Hesitant HHR
A customer brought in a Chevy HHR with the same T42 module, complaining of intermittent ‘no-shift’ conditions and a P0700 code that wouldn’t stay cleared. They’d already replaced two shift solenoids with no luck. After a quick data scan, I saw the TCM was dropping communication intermittently. Instead of another wild goose chase, we installed one of our pre-programmed TCMs. The total time on the lift was under an hour, and the car was shifting perfectly on the test drive. This story is incredibly common across the GM lineup—the issue is rarely the transmission internals, but the module controlling them.
Is Your Aura Showing These Transmission Symptoms?
- ✔️ Harsh, slamming shifts or delayed gear engagement.
- ✔️ Vehicle is stuck in “limp mode” and won’t shift out of 2nd or 3rd gear.
- ✔️ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔️ Complete failure to upshift or downshift, leading to poor acceleration and fuel economy.
- ✔️ Unpredictable electrical behavior related to the transmission.
A Straightforward Guide to Installation
For the 2007-2009 Saturn Aura, this is a repair most DIYers can handle in their own driveway. The TCM is typically located on the front left frame rail, making it accessible from under the hood.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: Find the TCM on the front left frame rail. It will have several large electrical connectors attached to it.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place. Securely reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s always good practice to use a basic OBD2 scanner to clear any stored fault codes from the vehicle’s memory.
Why Choose Our Programmed Saturn Aura TCM?
This isn’t just a part; it’s a complete solution. Built to strict OEM specifications for durability, this module ensures every command for gear changes and torque converter lockup is executed precisely. By solving the root cause of erratic transmission behavior, you not only improve drivability but also protect your transmission from the premature wear and tear that a faulty module can cause. It’s a smart, preventative repair backed by our one-year warranty for your peace of mind.
Verified Vehicle Compatibility
This module, service number 24243901, is a direct replacement for a wide range of GM vehicles equipped with the T42 controller. While this listing is for the Saturn Aura, it is also compatible with the following models (please verify location notes):
- Saturn Aura: 2007-2009 (LH frame rail front)
- Chevrolet Cobalt/HHR/Impala/Malibu, Pontiac G5/G6/Grand Prix: (Location varies: LH strut tower, lower air cleaner housing, LH frame rail)
- Chevrolet Silverado/Tahoe, GMC Sierra/Yukon: (Typically located next to the battery)
- Buick Allure/LaCrosse/Lucerne: (Typically in the lower air cleaner housing or LH engine compartment)
- And many more GM models from 2006-2014. This part interchanges with numbers like 24252114, 24234503, 24242391, and others.
Do I need to do any programming myself?
Do I need to do any programming myself?
No. This is the biggest advantage of our service. We program the module to your car’s specific Vehicle Identification Number (VIN) before shipping. It arrives ready to install, with no need for a trip to the dealership or a special scan tool.
Is this a difficult part to replace?
For most vehicles, including the Saturn Aura, this is a very straightforward job. It typically takes less than 30 minutes with basic hand tools. The module is usually in an accessible location in the engine bay.
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. In almost all cases where the TCM itself has failed, replacing it with this programmed unit will resolve the P0700 code and any other transmission-specific codes.
What is the warranty on this part?
We stand behind our products with a comprehensive one-year warranty. We are confident in the quality and programming of our modules, giving you confidence in your repair.
Do I need to send my old part back?
No, there is no core charge for this module. You can keep or dispose of your old part without any hassle, making the process faster and more convenient for you.