Restore Smooth Shifting to Your Saturn Aura
If your 2007-2009 Saturn Aura is suffering from erratic shifting, getting stuck in gear, or throwing transmission-related check engine lights, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen how a faulty TCM can make a perfectly good car feel unreliable and unsafe. This T42 Transmission Control Module, part number 24235754, is the definitive solution to restore your vehicle’s performance and your peace of mind. It’s not just a part; it’s the brain of your automatic transmission, precisely controlling gear changes and torque converter operation for a smooth, efficient ride.
A Technician’s Notebook: The Intermittent Aura
A few months back, a 2008 Saturn Aura came into my shop with a frustrating problem. The owner said it would shift perfectly for days, then suddenly slam into gear or refuse to shift past 2nd. The check engine light was intermittent. A scan showed a generic P0700 (Transmission Control System Malfunction) and a history of solenoid circuit codes. Instead of chasing ghosts by replacing solenoids, we went straight for the known point of failure on these platforms: the TCM. After installing a VIN-programmed module like this one, the shifting issues vanished completely. This case is typical; heat and vibration eventually degrade the module’s internal circuits, causing these exact unpredictable symptoms.
Is Your Saturn Showing These Telltale Signs?
A failing TCM will give you clear warnings. If you’re experiencing any of the following, it’s time for a replacement. Ignoring these symptoms can lead to more significant transmission damage down the road.
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle stuck in “limp mode” (usually second or third gear).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- ✔ A sudden drop in fuel economy.
- ✔ The transmission seems to slip out of gear.
Your Straightforward 30-Minute Installation Guide
One of the best features of this module is that it arrives programmed to your vehicle’s specific VIN. This eliminates the need for expensive dealership programming, making it a perfect job for a DIY enthusiast or a professional mechanic looking to save time. For the 2007-2009 Saturn Aura, the TCM is located on the front of the left-hand frame rail.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: Find the TCM mounted on the LH front frame rail in the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs, as old plastic can be brittle. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. While the module is plug-and-play, it’s always good practice to use a basic scan tool to clear any stored fault codes from the ECU.
Verified to Fit These GM Models
While this listing is focused on the 2007-2009 Aura Transmission Module, this T42 unit is compatible with a wide range of General Motors vehicles. Please verify your specific model and location notes below. This part is a direct replacement for service numbers 24235754, 24242391, 24234503, 24252114, and others.
AURA 07-09 Transmission; (LH frame rail front)
AVALANCHE 1500 07-08 Transmission; (next to battery)
CANYON 08-12 Transmission; (RH rear engine compartment)
COBALT 06-10 Transmission; (LH strut tower)
COLORADO 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
ENVOY 08-09 Transmission; (LH engine compartment)
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
G5 07-10 Transmission; (LH strut tower)
G6 06-10 Transmission; (LH strut tower)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HHR 06-11 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
ION 06-07 Transmission; (behind LH strut tower)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
LUCERNE 08-11 Transmission; (LH engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
MONTANA 06-09 Transmission; (LH strut tower)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
PURSUIT 06 Transmission; (LH strut tower)
RAINIER 06-07 Transmission
RENDEZVOUS 06-07 Transmission; (air cleaner box)
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SIERRA 1500 PICKUP 08 Transmission; (next to battery)
SIERRA 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 08 Transmission; (next to battery)
SILVERADO 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SSR 05-06 Transmission; (front LH frame)
SUBURBAN 1500 07-08 Transmission; (next to battery)
TAHOE 07 Transmission; (next to battery)
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
TERRAZA 06-07 Transmission; (LH strut tower)
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
TRAILBLAZER 08-09 Transmission; (LH engine compartment)
TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
UPLANDER 06-09 Transmission; (LH strut tower)
VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
VUE 09 Transmission; 2.4L, w/hybrid, LH side front engine compartment, (shift control)
VUE 09 Transmission; 2.4L, w/o hybrid; (LH front engine compartment)
VUE 10 Transmission
YUKON 07 Transmission; (next to battery)
YUKON 08 Transmission; (next to battery), w/o auxiliary oil cooler control
YUKON 09 Transmission; (next to battery), w/o auxiliary oil cooler pump
YUKON XL 1500 07-08 Transmission; (next to battery)
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. We program the module to your vehicle’s VIN before shipping it. This means it’s ready for installation right out of the box, with no extra programming or calibration required.
Is this a reliable, long-term fix?
Absolutely. This module is built to meet or exceed original equipment standards. By replacing the entire unit, you are addressing the root cause of the failure—degraded internal electronics—ensuring dependable performance for years to come. It’s backed by a one-year warranty for your protection.
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 or dispose of it yourself, saving you the time and hassle of a return shipment.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases where the TCM itself is the source of the fault, replacing it with this pre-programmed unit will resolve the P0700 and any related specific codes (like for solenoids or sensors).