Is Your Saturn Aura Shifting Erratically or Stuck in Gear?
If you’re dealing with the frustration of a transmission that won’t shift correctly, delayed gear engagement, or a check engine light that points to transmission trouble, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for every gear change and torque converter operation. When it fails, it can make your 2007-2009 Saturn Aura feel unpredictable and unsafe to drive. This genuine quality GM T42 TCM, service part number 24243901, is the definitive solution to restore your vehicle’s smooth, reliable performance.
From the Diagnostic Bay
We had a 2008 Saturn Aura come into the shop with classic symptoms of a bad transmission—harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The owner had already spent money replacing a couple of shift solenoids based on a generic code reading, but the problem persisted. After a quick diagnostic, we confirmed the issue wasn’t mechanical; it was the TCM itself providing faulty commands. We installed one of our VIN-programmed T42 modules, cleared the codes, and the car drove like it just left the factory. It’s a perfect example of why correctly diagnosing the electronic controller is key to avoiding unnecessary and costly mechanical repairs.
Symptoms of a Failing Saturn Aura TCM
A faulty TCM can manifest in various ways, often mimicking the symptoms of a mechanical transmission failure. Before considering a costly transmission rebuild, check if your vehicle is exhibiting any of these common electronic issues:
- ✔ Harsh or Delayed Shifting: Experiencing sudden, jerky shifts or a noticeable lag when the transmission changes gears.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (usually 2nd or 3rd) to prevent further damage.
- ✔ Illuminated Warning Lights: The Check Engine Light or a specific transmission warning light is on. Common associated Diagnostic Trouble Codes (DTCs) include P0700, P0750, and other solenoid-related faults.
- ✔ Inability to Shift: The transmission may refuse to upshift or downshift, regardless of speed or throttle input.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup caused by a faulty module can lead to a significant drop in MPG.
- ✔ Complete Communication Loss: In severe cases, the TCM may fail entirely, preventing the vehicle from starting or shifting out of Park.
The Plug-and-Play Solution: Pre-Programmed for Your Vehicle
The biggest challenge when replacing modern automotive electronics is the need for expensive dealership programming. Our T42 TCMs eliminate this step entirely. We pre-program each module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that the unit arrives ready for immediate installation with the latest GM software updates. This process guarantees perfect communication between the TCM, the engine computer, and the transmission itself, restoring factory performance without any additional setup.
Key Features & Benefits:
- VIN Programmed: Arrives ready for a true plug-and-play installation, saving you time and money on dealership programming fees.
- Restores Performance: Corrects erratic shifting, hesitation, and limp mode, providing smooth and precise gear changes.
- OEM-Standard Quality: Built to meet or exceed original equipment specifications for long-lasting durability and reliability.
- No Core Charge: Keep your old part without the hassle or expense of a core return.
- One-Year Warranty: Drive with confidence knowing your purchase is protected against defects.
Simple Installation for DIYers and Professionals
Replacing the Saturn Aura TCM is a straightforward job that can typically be completed in under 30 minutes. For the 2007-2009 Saturn Aura, the TCM is located on the front of the left-hand frame rail. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect the battery, and you’re ready to go. We recommend using a basic scan tool to clear any stored DTCs after installation for a clean slate.
This module is also a direct replacement for a wide range of other GM vehicles from 2006-2014, including models like the Chevrolet Impala, GMC Sierra, Pontiac G6, and Buick LaCrosse. It interchanges with numerous part numbers, such as 24252114, 24234503, and 24240400, making it a versatile solution for many popular cars, trucks, and SUVs. Put an end to your transmission troubles and order your pre-programmed T42 TCM today!
Frequently Asked Questions
What does a T42 Transmission Control Module do?
The T42 TCM is an electronic computer that acts as the brain for your automatic transmission. It receives data from various vehicle sensors (like speed and throttle position) to control shift points, line pressure, and torque converter lockup, ensuring smooth and efficient operation.
Is this module truly plug-and-play?
Yes. We program the module with your vehicle’s specific VIN before shipping. This means it has the correct software and calibration for your exact car, eliminating the need for any additional programming or setup at a dealership.
Where is the TCM located on a 2007-2009 Saturn Aura?
On the Saturn Aura for these model years, the Transmission Control Module is typically mounted on the front portion of the driver’s side (LH) frame rail in the engine compartment.
Will this part fix transmission error codes like P0700?
Yes. A P0700 code is a general fault code indicating the TCM has detected a problem. Replacing a faulty TCM with this programmed unit will resolve the root cause of P0700 and related solenoid or sensor codes that are triggered by the failing module.
Do I need to send my old TCM back?
No. We do not require a core return for this part. You can keep your old module without any additional charges or hassle.