Tired of Erratic Shifting in Your Saturn Aura?
If you’re dealing with the frustration of a transmission that won’t shift correctly, gets stuck in gear, or triggers a check engine light, you’re not alone. As a technician with over two decades of experience, I’ve seen countless GM vehicles, including the Saturn Aura, sidelined by a faulty Transmission Control Module (TCM). This isn’t just an annoyance; it’s a critical failure that impacts your car’s performance, fuel economy, and safety. The TCM is the brain of your automatic transmission, and when it fails, the symptoms can range from harsh, jarring shifts to a complete refusal to move out of ‘limp mode’.
This T42 Transmission Control Module is the definitive solution for your 2007-2009 Aura TCM issues. It arrives at your door fully pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits or specialized programming tools. This is a direct-fit, OEM-quality replacement designed to restore the crisp, predictable shifting you expect from your car.
A Technician’s Notebook: The Intermittent Gremlin
I remember a 2008 Saturn Aura that came into my shop with a complaint that stumped two other mechanics. The owner described random, violent downshifts on the highway, but by the time he got to a shop, the car would behave perfectly. No codes were stored. We drove it for two days with a data logger attached and saw nothing. On the third day, I was monitoring live transmission data and saw the torque converter clutch command flicker erratically for just a split second—then, BAM, a harsh shift. It was the TCM, failing under specific thermal conditions. A new, programmed module fixed it instantly. These intermittent issues are a classic sign of a failing 2007-2009 Aura TCM, where internal electronics are breaking down.
Common Signs of a Failing Saturn Aura TCM
- ✔ Unpredictable, harsh, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0750-series solenoid codes, or communication errors.
- ✔ Poor acceleration and significantly reduced fuel efficiency.
- ✔ The transmission seems to slip between gears or fails to engage from Park.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- ✔ Locate the Module: On the 2007-2009 Saturn Aura, the TCM is typically located on the front of the left frame rail in the engine compartment.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the bolts holding the old module in place.
- ✔ Install the New TCM: Mount the new module securely with the original bolts. Reconnect the electrical harnesses, ensuring they click firmly into place.
- ✔ Final Steps: Reconnect the battery terminal. While our VIN programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any lingering fault codes from the system’s memory.
Verified Vehicle Compatibility List
This T42 TCM, part number 24240400, is a direct replacement for a wide range of General Motors vehicles. While this page is focused on the 2007-2009 Aura TCM, it is also compatible with the following models. Please verify your specific part number for a perfect match.
- Saturn Aura: 2007-2009 (LH frame rail front)
- Chevrolet: Cobalt, HHR, Impala, Malibu, Monte Carlo, Tahoe, Silverado, Express, Avalanche, Colorado, SSR
- GMC: Yukon, Sierra, Savana, Envoy, Canyon
- Pontiac: G5, G6, Grand Prix, Pursuit
- Buick: LaCrosse, Allure, Lucerne, Rendezvous, Rainier
- Cadillac: DTS
- Saturn: Vue, Ion
- Hummer: H3
- Saab: 9-7X
This module interchanges with part numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24241806, 24243901, 24243921, 24255280, 24256960, and more.
Do I need to have this TCM programmed by a dealer?
Do I need to have this TCM programmed by a dealer?
No. We pre-program the module to your car’s VIN before shipping. It arrives ready for a plug-and-play installation, saving you time and money.
Is this a difficult part for a DIYer to replace?
Not at all. For most models, including the Saturn Aura, this is a straightforward job requiring basic hand tools. The module is easily accessible in the engine bay, and the entire process typically takes less than 30 minutes.
What is a core charge? Do I need to send my old part back?
There is no core charge for this part. You can keep your old module without any extra fees or hassle, making the repair process simpler for you.
What kind of warranty is included?
This module is backed by our one-year warranty, giving you peace of mind that you’re installing a reliable, quality part that is built to last.