Restore Flawless Shifting to Your Saturn Aura
If your 2007-2009 Saturn Aura is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, the problem is often a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the TCM is responsible for every gear change, torque converter clutch engagement, and diagnostic check. Over my 20 years in the bay, I’ve seen countless GM vehicles, including the Aura, develop these exact issues due to a faulty TCM. This isn’t just an annoyance—it’s a critical failure that impacts safety, fuel economy, and drivability.
We offer a reliable, permanent fix. This OEM-quality T42 TCM, part number 24234503, is the definitive solution. The best part? It arrives at your door fully programmed to your vehicle’s specific VIN. This means no expensive trips to the dealership for flashing or calibration. It’s a true plug-and-play repair that gets you back on the road with the smooth, predictable performance you expect.
From the Diagnostic Bay
I remember a 2008 Saturn Aura that came into the shop with a classic complaint: “It just doesn’t know what gear to be in.” The customer reported intermittent, jarring shifts and a check engine light that would come and go. A quick scan pulled up a P0700 (Transmission Control System Malfunction) and a couple of solenoid performance codes. The initial thought was a bad solenoid pack, but the intermittent nature of the problem pointed me elsewhere. After checking the wiring harness for damage, I focused on the TCM. These T42 modules, especially after years of heat cycles on the front frame rail, can develop internal faults that cause exactly this kind of unpredictable behavior. Swapping in a VIN-programmed module solved all the issues instantly. The car shifted like new, and the codes never returned. It’s a textbook case for this part.
Is Your Saturn Aura Showing These Telltale Signs?
A failing TCM will give you clear warnings. If you’re experiencing any of the following, it’s time to consider a replacement:
- âś” Unpredictable, harsh, or delayed gear shifts.
- âś” Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- âś” The Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- âś” A noticeable drop in fuel efficiency.
- âś” The transmission seems to slip out of gear or fails to engage properly from Park.
Your Step-by-Step Installation Guide
Replacing the 2007-2009 Aura TCM is a straightforward job for a confident DIYer or any professional mechanic. The module is located on the front of the left-hand frame rail. You can typically complete the swap in under 30 minutes.
- 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 Saturn Aura, you’ll find the module mounted to the front of the driver’s side (LH) frame rail.
- Disconnect the Connectors: Carefully unclip the electrical wiring harnesses from the old module. The clips can be brittle, so apply steady pressure.
- Remove the Old Module: Unbolt the old TCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and securely fasten it. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. While our programming handles the critical setup, it’s good practice to use a basic OBD-II scan tool to clear any stored fault codes.
Verified Fitment for Your Vehicle
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles. While this listing is focused on the Saturn Aura, it is also compatible with the following models. Always verify your part number (24234503) for a perfect match.
- Saturn Aura: 2007-2009 (Located on LH frame rail front)
- Chevrolet: Cobalt, HHR, Impala, Malibu, Monte Carlo, Silverado, Tahoe, Suburban, Express Van
- GMC: Sierra, Yukon, Savana Van, Canyon, Envoy
- Pontiac: G5, G6, Grand Prix
- Buick: LaCrosse, Allure, Lucerne, Rainier
- And more: Including select Cadillac, Hummer, and Saab models.
Frequently Asked Questions
Do I need to take this 2007-2009 Aura TCM to a dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s VIN. You provide us with your VIN during checkout, and we handle all the software flashing. It’s ready for installation right out of the box, saving you time and money.
What if I install it and my car still has problems?
While this TCM is a common fix, transmission issues can be complex. If problems persist, it could indicate a mechanical issue within the transmission (like a worn clutch pack) or a wiring harness problem. We recommend a full diagnostic check by a qualified technician if the new module doesn’t resolve the symptoms.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part, rigorously tested to meet or exceed original specifications and backed by our one-year warranty. It provides a reliable and long-lasting repair.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep or dispose of your old module without any hassle.