Restore Smooth Shifting to Your SAAB 9-7X
If you’re dealing with the headaches of a faulty transmission—like harsh shifting, getting stuck in gear, or a persistent check engine light—you’ve come to the right place. As a technician with over 20 years of experience, I’ve seen how a failing Transmission Control Module (TCM) can make you think your entire transmission is shot. This VIN-programmed T42 TCM, part number 24240400, is the definitive solution for your 2006-2009 SAAB 9-7X, designed to restore factory performance and get you back on the road with confidence.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 GMC Envoy—a cousin to the SAAB 9-7X—with classic symptoms: it wouldn’t shift past 2nd gear and the dash was lit up. Another shop had quoted him over $3,000 for a transmission rebuild. After a quick scan, I saw a P0753 (Shift Solenoid ‘A’ Electrical) and a U0101 (Lost Communication with TCM). Instead of tearing into the transmission, I checked the TCM connectors and power. Everything was fine. The issue wasn’t mechanical; it was the module itself. A faulty driver inside the TCM was causing the solenoid code and communication loss. We installed a VIN-programmed T42 module, cleared the codes, and the truck shifted perfectly. He saved thousands by correctly diagnosing the electronic failure first.
Is Your SAAB 9-7X Showing These Transmission Problems?
A failing TCM doesn’t always mean a catastrophic failure. Often, it starts with small, frustrating issues. Here are the common signs I see in the shop that point directly to a bad TCM:
- ✔ Unpredictable or harsh gear shifts that slam into place.
- ✔ The vehicle feels sluggish or refuses to shift, often getting stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy as the transmission isn’t operating efficiently.
- ✔ Complete loss of communication with the module, preventing diagnostics.
Your Straightforward 30-Minute Installation Guide
One of the best features of this module is that it’s designed for a straightforward swap. No specialized tools are required, and because we program it to your VIN, you can skip the expensive trip to the dealership. For the SAAB 9-7X, the process is simple.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On your 2006-2009 SAAB 9-7X, the Transmission Control Module is typically located in the engine compartment on the left-hand (driver’s) side.
- Disconnect and Remove: Carefully unclip the wiring harnesses connected to the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses. Ensure the clips click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and use a standard OBD2 scan tool to clear any stored fault codes from the computer’s memory. Your installation is complete.
Verified Fitment For These GM Vehicles
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with part numbers 24252114, 24234503, 24240400, and more. Please verify your vehicle’s compatibility below:
- SAAB 9-7X: 2006-2009
- Buick: Allure (06-09), LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
- Cadillac: DTS (06-11)
- Chevrolet: Avalanche 1500 (07-08), Cobalt (06-10), Colorado (08-12), Express Vans (06-14), HHR (06-11), Impala (06-11), Malibu (06-10), Monte Carlo (06-07), Silverado Pickups (07-13), SSR (05-06), Suburban 1500 (07-08), Tahoe (07-09), Trailblazer (06-09)
- GMC: Canyon (08-12), Envoy / Envoy XL (06-09), Savana Vans (06-14), Sierra Pickups (07-13), Yukon / Yukon XL 1500 (07-08)
- Hummer: H3 (08-10)
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06)
- Saturn: Aura (07-09), Ion (06-07), Vue (07-10)
Frequently Asked Questions
Do I need to take this to a dealer for programming?
No. This is the biggest benefit of our service. We pre-program the module to your vehicle’s specific VIN before shipping. It arrives ready for plug-and-play installation, saving you time and hundreds of dollars in dealership fees.
What tools are needed for installation?
You’ll only need basic hand tools, such as a socket set or wrench to unbolt the module and disconnect the battery. No special equipment is required.
Where is the TCM located on my 2007 SAAB 9-7X?
On the SAAB 9-7X and its platform mates like the Trailblazer and Envoy, the TCM is found in the engine bay, on the driver’s side (LH side).
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. This module will fix the underlying transmission issue that is causing the P0700 code, such as a faulty solenoid driver or internal communication error.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or recycle it without the hassle of sending it back to us.