If your Saturn Aura is struggling with erratic shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing a common failure point: the Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless drivers frustrated by these exact symptoms. The TCM is the brain of your automatic transmission, responsible for every gear change. When it fails, your car’s drivability and reliability suffer. This T42 TCM is the definitive, hassle-free solution, pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Forget about expensive dealership visits and the need for specialized programming tools. We handle the complex part for you. By programming this module with the latest GM software updates before it ships, we ensure it communicates perfectly with your vehicle’s systems right out of the box. This restores the crisp, predictable shifting you expect and resolves the underlying electronic faults that cause so many transmission headaches. This isn’t just a part; it’s a complete solution designed to get your car back on the road quickly and reliably.
Is Your Saturn Aura Showing These Transmission Warning Signs?
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ 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, leading to poor acceleration and terrible fuel economy.
- ✔ Complete loss of communication with the transmission, causing it to not function at all.
From the Diagnostic Bay: The Misleading Solenoid Code
A customer brought in a 2008 Saturn Aura with a classic complaint: it would randomly slam into gear and had a P0752 code for a stuck-on shift solenoid. The shop he’d visited before us wanted to do a full transmission rebuild. I’ve seen this hundreds of times. While the code points to a solenoid, the root cause is often the TCM failing to properly command it. We connected our diagnostic tool and saw the voltage commands from the TCM were erratic. Instead of a costly internal repair, we installed a VIN-programmed 2007-2009 Aura TCM. The problem was solved in under an hour, saving the customer thousands and reinforcing that proper diagnosis starts with the electronics.
A Straightforward Guide to Your TCM Replacement
Installing your new 2007-2009 Aura TCM is a job most DIYers can handle in their own driveway. For the Saturn Aura, the module is typically located on the front of the left-hand frame rail.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: Find the TCM on the LH frame rail at the front of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs, as they can become brittle over time. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the electrical harnesses. You should hear a click as they lock.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any stored fault codes from the system. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility List
This T42 TCM, part number 24235753, is a direct replacement for a wide range of General Motors vehicles. While this page is focused on the Saturn Aura, it is also compatible with the following models. Please verify the location described in the list matches your vehicle.
- Saturn Aura (2007-2009): Transmission; (LH frame rail front)
- Chevrolet Cobalt / HHR / Impala / Monte Carlo (2006-2011)
- Chevrolet Silverado / Tahoe / Suburban (2007-2013)
- GMC Sierra / Yukon (2007-2013)
- Pontiac G5 / G6 / Grand Prix (2006-2010)
- Buick Allure / LaCrosse / Lucerne (2006-2011)
- And many more GM models from 2006-2014. Please see the full fitment list for details.