If you’re behind the wheel of a 2006-2009 SAAB 9-7X and experiencing the frustration of harsh shifts, a transmission that won’t shift out of gear, or a glowing check engine light, you’re not alone. As a technician with over two decades of diagnostic experience, I’ve seen these exact symptoms hundreds of times. The culprit is almost always a failing Transmission Control Module (TCM). This isn’t just an inconvenience; it’s a critical failure that affects your vehicle’s drivability, safety, and fuel economy. The TCM is the electronic brain of your automatic transmission, and when it fails, the entire system is compromised.
We offer a reliable, permanent solution: this OEM-quality T42 Transmission Control Module, part number 24235753. What sets our module apart is our expert VIN programming service. Before we ship it, we flash the module with your vehicle’s specific VIN and the latest GM software updates. This means it arrives at your door ready for a true plug-and-play installation, completely eliminating the need for an expensive and time-consuming trip to the dealership for programming. You get a part that communicates perfectly with your vehicle’s systems right out of the box.
A Straightforward Guide to Your TCM Replacement
Replacing the 2006-2009 SAAB 9-7X TCM is a job most DIYers can handle in their own garage in under 30 minutes. The module is conveniently located in the engine compartment, making access simple.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: On your SAAB 9-7X, the TCM is typically found in the left-hand (driver’s side) of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid damaging them. 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. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is pre-programmed, it’s always good practice to use a basic OBD2 scan tool to clear any stored diagnostic trouble codes (DTCs) from the system’s memory. Start the vehicle and enjoy restored, smooth shifting.
A Technician’s Notebook: The Misleading Solenoid Code
A customer brought in their 2008 SAAB 9-7X, stuck in limp mode (3rd gear only) with a P0750 code, indicating a shift solenoid failure. They had already replaced the solenoid inside the transmission pan—a messy, time-consuming job—but the problem persisted. My experience immediately pointed to the TCM. These T42 modules are known to fail internally, often creating false codes that send mechanics on a wild goose chase. We installed one of our VIN-programmed TCMs, cleared the codes, and the vehicle shifted perfectly. The customer saved hundreds on what could have been a full transmission rebuild, all because the true problem was the external electronic controller.
Is Your SAAB 9-7X Showing These Symptoms?
A faulty TCM can manifest in several ways. If you notice any of the following, it’s a strong indicator that your module needs replacement. Ignoring these signs can lead to more severe transmission damage.
- ✔ Harsh, clunky, or erratic gear shifts.
- ✔ The transmission getting stuck in one gear (often called ‘limp mode’).
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ A sudden drop in fuel efficiency or signs of the transmission overheating.
Verified Vehicle Compatibility
This T42 TCM 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 is focused on the 2006-2009 SAAB 9-7X TCM, it also fits the following models. Please verify your specific model and location note.
- SAAB 9-7X (2006-2009): Transmission; (LH engine compartment)
- Buick Rainier (2006-2007): Transmission
- Chevrolet Trailblazer (2006-2009): Transmission; (LH engine compartment), (8 cylinder for 06-07)
- GMC Envoy (2006-2009): Transmission; (LH engine compartment), (8 cylinder for 06-07)
- Hummer H3 (2008-2010): Transmission; (RH rear engine compartment)
- Chevrolet Colorado (2008-2012): Transmission; (RH rear engine compartment)
- GMC Canyon (2008-2012): Transmission; (RH rear engine compartment)
- …and many other GM cars, trucks, and SUVs. See the full fitment list for details.
This module is interchangeable with part numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24252114, 24255280, 24256960, 24235732, 24240449, YNXS.
Frequently Asked Questions
What exactly is VIN programming and why do I need it?
VIN programming involves loading your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the corresponding GM-certified software onto the TCM. This ensures the module works seamlessly with your engine, ABS, and other vehicle systems for correct shift points, torque converter lockup, and overall performance. Our service saves you from paying dealer programming fees.
Is this a difficult part for a DIYer to install?
Not at all. This is one of the easier electronic module replacements. It’s typically located in the engine bay and held on by a few bolts. With basic hand tools, the swap can be done in under 30 minutes. Our plug-and-play programming makes it even simpler.
Will this fix a P0700 trouble code?
A P0700 code is a generic fault code indicating the TCM has detected a problem and has requested the check engine light be turned on. While a faulty TCM itself can cause this code, it often appears alongside more specific codes (like for solenoids or sensors). Replacing a bad TCM is a very common and effective way to resolve a P0700 and its related codes.
Do I need to send my old part back? Is there a core charge?
No, there is absolutely no core charge for this part. You can keep your old module or dispose of it at your convenience, making the process hassle-free.
What kind of warranty comes with this module?
We stand behind the quality of our parts. This Transmission Control Module comes with a one-year warranty, giving you peace of mind and protection for your investment.