If your 2007-2009 Saturn Aura is suffering from erratic shifting, getting stuck in gear, or throwing transmission-related codes, you’re likely dealing with a failed Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make driving frustrating and unpredictable. This T42 Transmission Control Module, part number 24243901, is the reliable, pre-programmed solution to restore your vehicle’s performance and get you back on the road with confidence.
Over my 20+ years in the bay, I’ve seen countless GM vehicles come in with these exact symptoms. The T42 module is a workhorse, but like any electronic component, it can fail over time due to heat cycles and vibration. This isn’t just an inconvenience; it affects fuel economy and can lead to more significant transmission damage if ignored. Our module is built to meet or exceed original equipment standards, ensuring a lasting repair.
A Technician’s Notebook
A customer brought in a 2008 Saturn Aura with a classic complaint: “It feels like it’s getting slammed into gear.” During the test drive, I confirmed harsh 1-2 and 2-3 shifts. A quick scan pulled a P0752 code (Shift Solenoid A Stuck On). While the code points to a solenoid, experience has taught me that on these T42 systems, the driver circuit inside the TCM is often the root cause. Instead of a costly internal transmission repair, we installed one of our VIN-programmed TCMs. The shifting immediately smoothed out, and the code never returned. This highlights how a new, properly programmed module can be the correct fix for what seems like a mechanical issue.
Is Your Aura Showing These Symptoms?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s time to consider a replacement 2007-2009 Aura TCM.
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- ✔ A sudden drop in fuel efficiency.
- ✔ The transmission seems to slip out of gear or fails to engage.
A Straightforward Guide to Installation
One of the biggest benefits of this module is its simple, DIY-friendly installation. Because we program it to your vehicle’s VIN before shipping, you won’t need a trip to the dealership for expensive programming. For the Saturn Aura, the process is straightforward.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On the 2007-2009 Saturn Aura, the TCM is typically located on the front of the left-hand frame rail in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new TCM into place and securely reconnect the electrical harnesses. You’ll hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the system may reset on its own, it’s best practice to use a basic OBD2 scan tool to clear any stored fault codes. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct fit for the 2007-2009 Aura TCM and is also compatible with a wide range of other General Motors vehicles. Please verify your specific model and part number. This module is interchangeable with part numbers including 24252114, 24234503, 24243901, and others.
- Saturn Aura: 2007-2009 (Transmission; LH frame rail front)
- Chevrolet Cobalt: 2006-2010 (Transmission; LH strut tower)
- Chevrolet HHR: 2006-2011 (Transmission; LH engine compartment)
- Chevrolet Impala: 2006-2011 (Transmission; lower air cleaner housing)
- Chevrolet Malibu: 2006-2010 (Transmission; LH frame rail)
- Pontiac G6: 2006-2010 (Transmission; LH strut tower)
- And many more GM models from 2006-2014.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. We pre-program the module to your vehicle’s specific VIN before shipping. It arrives ready for plug-and-play installation, saving you time and money.
What is a TCM and what does it do?
The Transmission Control Module (TCM) is a computer that controls your automatic transmission’s functions, such as when to shift gears, torque converter lockup, and line pressure, ensuring optimal performance and efficiency.
Is this part difficult to install?
For most DIYers with basic tools, this is a very manageable job that typically takes under 30 minutes. Its location on the Aura’s frame rail is relatively easy to access.
Will this fix a P0700 trouble code?
A P0700 is a generic code indicating the TCM has detected a fault. While this module often resolves the underlying issue causing the P0700 (like a solenoid circuit fault), you should always diagnose the specific codes stored within the TCM for a complete picture.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without any hassle or need to return it.