Restore Crisp, Reliable Shifting to Your SAAB 9-7X
If your 2006-2009 SAAB 9-7X is suffering from erratic shifting, getting stuck in gear, or has illuminated the check engine light with transmission codes, you’ve likely pinpointed a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty T42 TCM can cause a cascade of frustrating and potentially damaging drivability issues. This module is a direct-fit, OEM-quality solution, pre-programmed to your vehicle’s specific VIN to eliminate the need for costly dealership visits and ensure a seamless, plug-and-play repair.
Over my two decades in automotive diagnostics, I’ve seen hundreds of GM vehicles, including the SAAB 9-7X, come into the shop with what seems like a major transmission failure. More often than not, the root cause isn’t the hard parts but this critical electronic controller. Replacing it with a properly programmed unit like this one restores the precise communication needed for smooth gear changes, correct torque converter lockup, and overall powertrain health.
From the Diagnostic Bay: The Ghost in the Transmission
A customer brought in a 2008 GMC Envoy—a sibling to the SAAB 9-7X on the same platform—complaining of harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). He had already replaced two shift solenoids based on DTCs, but the problem persisted. After hooking up my scan tool and monitoring data, I noticed erratic command signals from the TCM. The solenoids were just following bad orders. We installed a VIN-programmed T42 TCM, and in less than 30 minutes, the truck was shifting like it just left the factory. It’s a classic case where chasing codes can be misleading; the controller itself was the true culprit.
Is Your SAAB 9-7X Exhibiting These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission breakdown. Watch for these early warning signs that point directly to a module issue. Addressing them with a new 2006-2009 SAAB 9-7X TCM can prevent further mechanical wear.
- ✔ Abrupt, harsh, or delayed gear shifts.
- ✔ The vehicle enters “limp mode,” refusing to shift out of a single gear.
- ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, or other solenoid circuit faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration and fuel economy.
- ✔ Unexplained loss of communication with the transmission module.
A Mechanic’s Guide to a Quick TCM Swap
This is a repair that a confident DIYer or any professional technician can complete quickly. The location of the TCM on the 2006-2009 SAAB 9-7X is in the engine compartment on the driver’s side (LH side), making access straightforward.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and allow the system to reset.
- Locate the Module: Find the TCM in the LH engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in place and securely fasten the bolts. Reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a scan tool to clear any stored historical fault codes from the ECU. Start the vehicle and test drive to confirm smooth shifting.
Confirmed Vehicle Compatibility List
This T42 TCM, part number 24255280, is a direct replacement for a wide range of General Motors vehicles. While this page is focused on the 2006-2009 SAAB 9-7X TCM, it also fits the following models. Always verify your part number for a perfect match.
- SAAB 9-7X (2006-2009) – LH engine compartment
- Chevrolet Trailblazer (2006-2009) – LH engine compartment
- GMC Envoy / Envoy XL (2006-2009) – LH engine compartment
- Buick Rainier (2006-2007)
- Chevrolet Silverado, Tahoe, Suburban (2007-2013) – Next to battery
- GMC Sierra, Yukon, Yukon XL (2007-2013) – Next to battery
- Cadillac Escalade (2007-2008) – Next to battery
- Hummer H3 (2008-2010) – RH rear engine compartment
- And many other GM cars, trucks, and vans from 2006-2014.
Frequently Asked Questions
Does this module really not require any programming?
That’s correct. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation, with no need for a trip to the dealer or a special scan tool for programming.
Is this a new or used part?
This is an OEM-quality replacement part, inspected and programmed to meet or exceed original factory specifications for performance and reliability. It is backed by our one-year warranty.
Where is the TCM located on my 2007 SAAB 9-7X?
On the 2006-2009 SAAB 9-7X, the Transmission Control Module is conveniently located in the engine bay, on the driver’s side (LH) inner fender or firewall area.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the ECU to turn on the check engine light. While this module often resolves the underlying issue causing the P0700 (like a solenoid circuit fault), you should diagnose any other specific codes that are present to confirm the TCM is the root cause.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module or recycle it locally, making the process hassle-free.