Restore Peak Performance to Your GM Vehicle
Is your 2007-2009 Saturn Aura, Pontiac G6, or Chevrolet Malibu suffering from erratic shifting, delayed gear engagement, or a persistent check engine light? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and ensuring overall drivetrain efficiency. When it falters, your vehicle’s drivability and reliability are compromised. This genuine OEM-quality T42 TCM, part number 24235732, is the definitive solution to restore your transmission’s precise operation.
From the Diagnostic Bay
We recently had a 2008 Saturn Aura come into the shop with the check engine light on and the transmission stuck in 3rd gear—a classic ‘limp mode’ scenario. The owner was frustrated, having been told by another shop he might need a whole new transmission. After a quick scan, we pulled code P0700 (Transmission Control System Malfunction) and several solenoid-specific codes. We knew right away the TCM was the likely culprit. Instead of a costly transmission replacement, we installed one of our VIN-programmed T42 modules. The installation took less than 30 minutes. After clearing the codes, the car shifted perfectly on the test drive. The customer saved thousands and drove away with a vehicle that felt brand new again. This is a common story for these platforms, and a pre-programmed module is almost always the right fix.
Symptoms of a Failing T42 Transmission Module
- ✔ Harsh Shifting and Gear Slipping: Experiencing abrupt, jerky shifts between gears or feeling the transmission slip as it tries to engage.
- ✔ Stuck in Gear or Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Warning Lights Illuminated: The Check Engine Light or a specific transmission warning light is active on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700, P0750, P0751, P0753, P0756, and other solenoid-related faults.
- ✔ Delayed Engagement: A noticeable pause when shifting from Park into Drive or Reverse.
- ✔ Poor Fuel Economy: Inefficient shifting patterns cause the engine to work harder, leading to a significant drop in MPG.
The Superior Solution: A Pre-Programmed 2007-2009 Aura Transmission Module
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership for calibration. Our T42 TCMs are meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) before they ship. This critical step ensures complete compatibility with your vehicle’s factory settings, engine, and existing electronics. It’s a true plug-and-play solution that eliminates the need for additional programming, saving you time and money. By loading the latest GM software updates, we also address common factory bugs and improve transmission performance beyond the original specifications. This is the most reliable and efficient way to get your car back on the road.
Installation and Compatibility
Replacing the TCM is a straightforward job for a confident DIYer or any professional mechanic. The module is typically located in the engine compartment—often on the LH frame rail in the Saturn Aura, next to the battery in trucks like the Silverado, or under the air cleaner box in models like the Impala. The entire process usually takes less than an hour.
Installation Steps:
- Safety First: Disconnect the negative terminal of your vehicle’s battery.
- Locate the Module: Find the old TCM based on your specific vehicle model.
- Disconnect and Remove: Carefully unplug the electrical connectors and unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed module in place and securely reconnect the electrical harnesses.
- Final Steps: Reconnect the battery. While the module is plug-and-play, it’s always best practice to use a scan tool to clear any stored DTCs from the system.
This module is a direct replacement for a wide range of GM vehicles from 2006-2014 equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, including 24242391, 24234503, 24252114, 24230461, and 24256960, among others.
Frequently Asked Questions
What exactly does the T42 Transmission Control Module do?
The TCM acts as the central computer for your automatic transmission. It receives data from various sensors (like vehicle speed, throttle position, and engine RPM) to determine the perfect moment to shift gears, control line pressure, and manage the torque converter clutch. A functioning TCM is essential for smooth performance, fuel efficiency, and transmission longevity.
Is this part difficult to install myself?
For most individuals with basic mechanical skills and tools, the installation is quite simple and typically takes under an hour. The key is locating the module, which varies by vehicle. Disconnecting the battery and swapping the modules is a straightforward process. No complex programming is required on your end.
Why is VIN programming so important?
VIN programming loads your vehicle’s specific software and calibration files onto the module. Without it, the TCM won’t be able to communicate correctly with your vehicle’s other computers, leading to continued shifting problems or a no-start condition. Our pre-programming service makes the part ready for immediate installation, just like an OEM replacement from a dealer, but without the hassle.
Will this fix my check engine light for code P0700?
Yes, in most cases. The P0700 code is a general fault code indicating that the TCM has detected a problem and requested the check engine light to be turned on. When the faulty TCM is replaced with this functional, programmed unit, the source of the fault is corrected. After clearing the codes, the P0700 and related transmission codes should not return.
Do I need to return my old part?
No, there is no core charge for this part. You can keep your old module, which saves you the time and expense of shipping it back.