If you’re dealing with the frustrating and unpredictable behavior of a failing transmission in your SAAB 9-7X, you know how quickly it can ruin your driving experience. Harsh clunks when shifting, getting stuck in a single gear, or seeing that dreaded check engine light can point to a complex and expensive problem. But often, the issue isn’t a mechanical failure inside the transmission itself; it’s the electronic brain that controls it—the Transmission Control Module (TCM).
This T42 TCM is the definitive solution for your 2006-2009 SAAB 9-7X TCM issues. As the central command for your vehicle’s 4L60E, 4L65E, or 4L70E automatic transmission, it manages everything from shift points and line pressure to torque converter lockup. When it fails, the symptoms can be alarming. I’ve seen hundreds of these GM vehicles in my shop where owners feared a complete transmission rebuild, only to find that a faulty TCM was the true culprit. This module is a direct-replacement part, engineered to meet or exceed original equipment specifications for a lasting repair.
Case Study: The ‘Ghost’ in the Transmission
A customer brought in his 2008 SAAB 9-7X with a classic ‘ghost’ problem. The vehicle would randomly refuse to upshift from 2nd gear and throw a P0750 shift solenoid code. He’d already replaced the solenoid twice at another shop with no success. After hooking up my scan tool and monitoring live data, I saw erratic voltage commands coming from the TCM. The solenoid was fine; the module giving the orders was failing internally. We installed one of our VIN-programmed T42 modules, and the problem was solved instantly. It saved him from a potential valve body replacement and hundreds in wasted diagnostic fees.
Key Signs of a Failing Transmission Module
- ✔️ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔️ Vehicle enters ‘limp mode,’ often stuck in 2nd or 3rd gear, with limited power.
- ✔️ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔️ Diagnostic Trouble Codes (DTCs) are present, such as the general P0700 code or specific solenoid circuit codes (e.g., P0750, P0751, P0755).
- ✔️ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔️ Complete loss of communication with the TCM, preventing diagnostics.
A Straightforward Guide to Installation
One of the best features of this module is that it arrives pre-programmed to your vehicle’s VIN. This eliminates the need for expensive dealership tools or programming, making it a perfect job for a DIY enthusiast or a professional mechanic looking to save time. The entire process typically takes less than 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and to help reset the vehicle’s electronic systems.
- Locate the Module: On the SAAB 9-7X and similar GM platforms (like the Trailblazer and Envoy), the TCM is typically found in the engine compartment, mounted on the left-hand (driver’s side) inner fender or near the strut tower.
- Swap the Part: Carefully unplug the electrical connectors. Be gentle with the locking tabs, as they can become brittle over time. Unbolt the old module from its bracket and secure the new one in its place.
- Reconnect and Finalize: Plug the connectors firmly into the new module. Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any lingering fault codes from the ECU.
Verified Compatibility for Your Vehicle
This module is a direct replacement for part number 24241806 and other interchangeable numbers. It is specifically programmed for and compatible with the following models, among many others:
- SAAB 9-7X: 2006, 2007, 2008, 2009 (LH engine compartment)
- Chevrolet Trailblazer: 2006-2009 (8 cylinder, LH engine compartment)
- GMC Envoy: 2006-2009 (8 cylinder, LH engine compartment)
- Chevrolet Silverado 1500 / GMC Sierra 1500: 2007-2013 (Located next to battery)
- Chevrolet Tahoe / GMC Yukon: 2007-2009 (Located next to battery)
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please verify the part number or contact us with your VIN to ensure perfect fitment.
By choosing our pre-programmed 2006-2009 SAAB 9-7X TCM, you’re not just buying a part; you’re buying a reliable, time-saving solution that restores your vehicle’s performance and your peace of mind. No core charge means you can complete the job without the hassle of sending the old part back. Order yours today and get your vehicle shifting smoothly again.
Frequently Asked Questions
Do I need to take this module to the dealer for programming?
No. We pre-program the module to your vehicle’s specific VIN before shipping. It arrives ready for plug-and-play installation, with no additional programming required.
What information do you need to program the TCM?
We only need your vehicle’s 17-digit Vehicle Identification Number (VIN). You can typically find this on your driver’s side dashboard (visible through the windshield) or on the driver’s door jamb sticker.
Will this fix a P0700 trouble code?
A P0700 code is a general code indicating the TCM has detected a fault. While a failing TCM is a very common cause, this code can also be triggered by other issues. However, if you are also experiencing symptoms like erratic shifting or limp mode, replacing the TCM is the most likely solution.
Is this a difficult part to install myself?
For most DIYers with basic hand tools, this is a very straightforward installation. The module is usually easy to access in the engine bay, and the process involves unplugging connectors and removing a few bolts. Our installation guide above provides the key steps.
Is there a core charge for my old part?
No, there is no core charge. You are not required to return your old, faulty module, which simplifies the process for you.