Is Your Saturn Aura Shifting Erratically?
If you’re experiencing harsh shifting, delayed gear engagement, or seeing a check engine light on your 2007, 2008, or 2009 Saturn Aura, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it begins to fail, it can cause a cascade of frustrating and potentially damaging issues, from poor fuel economy to being stuck in ‘limp mode’.
This genuine OEM-quality GM T42 Transmission Control Module is the definitive solution to restore your vehicle’s performance. It arrives pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits or specialized programming tools. This plug-and-play module is designed to directly replace your original unit, ensuring a perfect fit and immediate resolution to common transmission problems.
From the Diagnostic Bay
We had a 2008 Saturn Aura come into the shop with the classic symptoms: the transmission was banging into gear and the check engine light was on with a P0700 code. The owner had already replaced two shift solenoids based on a generic code reader’s suggestion, but the problem persisted. After a quick scan with our professional equipment, we identified communication errors pointing directly to the TCM. Instead of throwing more parts at it, we installed a VIN-programmed T42 module. The car immediately started shifting perfectly, and all codes were cleared. It’s a reminder that targeting the root cause—often the module itself—saves time, money, and a lot of frustration.
Diagnosing a Faulty 2007-2009 Aura Transmission Module
A failing TCM can manifest in various ways, often mimicking mechanical transmission failure. Before considering a costly transmission rebuild, check for these common electronic symptoms. Replacing the 2007-2009 Aura Transmission Module is a precise and effective repair for these issues.
Common Symptoms of TCM Failure
- ✔ Harsh or Erratic Shifting: The vehicle may slam into gear, hesitate between shifts, or shift at the wrong RPMs.
- ✔ Stuck in Gear / Limp Mode: The transmission may refuse to shift out of a single gear (often 2nd or 3rd) to protect itself from further damage.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light will illuminate on the dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): You may find codes like P0700 (Transmission Control System Malfunction), U0101 (Lost Communication with TCM), or various solenoid-specific codes (e.g., P0751, P0756).
- ✔ No Upshift or Downshift: The vehicle may struggle to accelerate or fail to downshift when you slow down, leading to a jerky ride.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lock-up control can lead to a noticeable drop in MPG.
- ✔ Complete Communication Loss: In severe cases, the module may fail entirely, preventing the vehicle from starting or moving.
Plug-and-Play Solution: The Benefit of VIN Programming
The single most significant advantage of this module is our complimentary VIN programming service. Each T42 TCM is loaded with the latest GM software specific to your Saturn Aura’s Vehicle Identification Number. This ensures that all shift points, pressure controls, and diagnostic parameters are perfectly matched to your vehicle’s factory specifications. This critical step guarantees a seamless installation without any additional calibration, resolving common DTCs and restoring optimal transmission function right out of the box.
Installation and Compatibility
Installation is straightforward for a DIY mechanic or any professional technician. On the Saturn Aura, the TCM is typically located on the front of the left frame rail. Always disconnect the vehicle’s battery before beginning the replacement. Once the new module is installed and the battery is reconnected, the vehicle’s internal systems will reset. We recommend using a basic scan tool to clear any stored DTCs after installation is complete. This part requires no core charge, so you can keep your old module without any hassle.
This module is a direct replacement for multiple GM part numbers, including: 24256960, 24252114, 24234503, 24242391, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24235732, 24235753, 24240449, and YNXS.
Frequently Asked Questions
What is VIN programming and why is it necessary?
VIN programming involves loading your vehicle’s specific software and calibration files onto the Transmission Control Module. This is crucial because GM vehicles have unique settings for engine size, gear ratios, and tire size. Our programming ensures the module works perfectly with your exact vehicle configuration right out of the box, preventing compatibility issues and error codes.
Will this fix my P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem and requested the Check Engine Light to be turned on. While P0700 itself doesn’t pinpoint the TCM as the failure, it is very commonly present when the TCM is faulty. Replacing a bad module with this pre-programmed unit will resolve the underlying issue causing the P0700 code.
Is this a difficult part to install myself?
For someone with basic mechanical skills, the installation is quite manageable and typically takes less than an hour. The TCM on a Saturn Aura is located on the LH front frame rail, making it accessible. The main steps are disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and then installing the new one in reverse order. No special tools are required beyond standard wrenches or sockets.
Do I need to return my old TCM?
No, there is no core charge or requirement to return your old part. You can dispose of it or keep it at your convenience, making the purchasing process simpler and hassle-free.
Is this part compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a wide range of 2006-2014 GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this listing is for the 2007-2009 Aura, it also fits models like the Chevrolet Impala, Silverado, Tahoe; GMC Sierra; Pontiac G6, and many others. We program it specifically for the vehicle you order it for.