Restore Smooth, Reliable Shifting to Your SAAB 9-7X
If you’re experiencing frustrating and unpredictable transmission behavior in your 2006-2009 SAAB 9-7X, a failing Transmission Control Module (TCM) is the most likely culprit. As the electronic brain of your automatic transmission, the T42 TCM governs every gear change, manages torque converter clutch engagement, and monitors system health. When it fails, you’re often left with harsh shifting, a vehicle stuck in limp mode, or a persistent check engine light that won’t go away. This isn’t just an annoyance—it’s a critical component failure that can affect vehicle safety and long-term transmission health.
This OEM-quality T42 TCM, corresponding to part number 24238856, is the definitive solution. We take the guesswork and dealership hassle out of the equation by pre-programming it to your vehicle’s specific VIN. This means it arrives ready for a true plug-and-play installation, with the latest GM software updates already loaded. You get a reliable fix that restores factory performance without needing expensive scan tools or a trip to the service center for programming.
From the Diagnostic Bay: The SAAB That Wouldn’t Shift Right
I remember a 2008 SAAB 9-7X that came into my shop with a classic case of transmission confusion. The owner had already replaced a couple of shift solenoids based on some generic codes, but the problem persisted: delayed engagement into Drive, harsh 1-2 shifts, and an intermittent transmission warning light. The main code was a P0700, which is just a general fault code requested by the TCM. It doesn’t tell you *what’s* wrong, just that the transmission controller has detected a problem. After confirming the solenoids were functioning correctly, we focused on the T42 module itself. Heat and vibration are the enemies of these units. We installed one of our VIN-programmed modules, and the difference was immediate. All shifting became crisp and smooth, and the P0700 code was cleared for good. It’s a textbook example of how replacing the controller is often the correct, and final, repair.
Is Your SAAB 9-7X Showing These Transmission Problems?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s time to consider a replacement:
- ✔ Harsh, banging, or erratic gear shifts.
- ✔ The vehicle feels stuck in one gear (often 2nd or 3rd), a condition known as “limp mode.”
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Delayed shifting or a long pause when moving from Park to Drive or Reverse.
- ✔ Poor fuel economy or a feeling of slipping between gears.
- ✔ Complete loss of communication with the transmission, leading to a no-shift condition.
A Straightforward Guide to Installation
One of the best features of this module is its ease of installation. For the SAAB 9-7X and similar GM platform vehicles, this is a job most DIY enthusiasts can handle in their own driveway 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 vehicle’s electronic systems.
- Locate the Module: On the 2006-2009 SAAB 9-7X, the TCM is typically found in the engine compartment on the driver’s side (LH side).
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always good practice to use a basic OBD2 scan tool to clear any stored diagnostic trouble codes from the ECU.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page focuses on the 2006-2009 SAAB 9-7X, it is also compatible with many other models. Please verify the location noted in parentheses for your specific vehicle.
- SAAB 9-7X 06-09 (LH engine compartment)
- Chevrolet Silverado & GMC Sierra 1500 07-13 (Next to battery)
- Chevrolet Tahoe & GMC Yukon 07-09 (Next to battery)
- Chevrolet Trailblazer & GMC Envoy 06-09 (LH engine compartment)
- Cadillac DTS 06-11 (RH front engine compartment)
- Hummer H3 08-10 (RH rear engine compartment)
- Chevrolet Impala 06-11 (Lower air cleaner housing)
- Buick LaCrosse / Allure 06-09 (Lower air cleaner housing)
- Pontiac G6 06-10 (LH strut tower)
- …and many more GM cars, trucks, and SUVs.
Frequently Asked Questions
What does “VIN Programmed” mean for me?
It means this module arrives at your door ready to install. We load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This eliminates the need for expensive programming at a dealership, making it a true plug-and-play solution.
Do I need to send my old TCM back?
No. There is no core charge for this part. You can keep your old module or dispose of it, saving you the time and hassle of a return shipment.
Will this fix a P0700 trouble code?
In many cases, yes. A P0700 code is a general fault code that simply means the TCM has detected an internal or system problem. If the TCM itself is the source of the fault, replacing it with this programmed unit is the correct fix to clear the code and resolve the underlying issue.
Where is the TCM located on my 2007 SAAB 9-7X?
For the 2006-2009 SAAB 9-7X, the Transmission Control Module (TCM) is located in the engine bay, on the driver’s side (LH) inner fender or firewall area.
Is this a genuine GM part?
This is a high-quality replacement part built to meet or exceed original equipment (OEM) specifications for performance and reliability. It is designed to function identically to the factory module once programmed to your VIN.