If your 2007, 2008, or 2009 Chevrolet Tahoe is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can sideline an otherwise reliable SUV. The T42 TCM, part number 24243901, is the brain of your 4L60E or 4L70E transmission, and when it fails, it can cause a host of frustrating and potentially damaging issues. This isn’t just a part; it’s the solution to restore your vehicle’s drivability and your peace of mind.
We take the guesswork and dealership hassle out of the repair. Each module is expertly programmed to your vehicle’s specific VIN before it ships. This means no expensive trips to the dealer for programming—it arrives ready for a true plug-and-play installation. This is the exact fix I’ve used in my shop countless times to get customers back on the road quickly and affordably.
Case Study: A Tricky Diagnosis
A customer brought in their ’08 Tahoe, complaining it was stuck in ‘limp mode’ (3rd gear only) and the check engine light was on. They’d already replaced a couple of shift solenoids with no luck. A quick scan showed a P0700 (Transmission Control System Malfunction) and an intermittent solenoid circuit code. Instead of just throwing more parts at it, we checked the TCM harness—it was fine. Experience pointed to the T42 module itself. After installing one of our VIN-programmed units, all codes cleared and the Tahoe shifted perfectly on the test drive. It’s a classic example of how a faulty module can mimic internal transmission problems, and why starting with the ‘brain’ is often the smartest diagnostic step.
Is Your Tahoe Exhibiting These Telltale Signs?
A failing 2007-2009 Tahoe Transmission Module can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your TCM needs attention:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle feels stuck in one gear and won’t upshift or downshift (Limp Mode).
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0751, or other solenoid-related faults.
- ✔ Poor fuel economy and a feeling of sluggish performance.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Your Tahoe TCM Swap
One of the best parts about this solution is its simplicity. For most DIYers or any professional mechanic, this is a quick job. On the GMT900 platform trucks like your Tahoe, the TCM is typically easy to access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your 2007-2009 Tahoe, the TCM is usually located in the engine bay, right next to the battery. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the electrical connectors. Use a socket to remove the bolts or nuts holding the module bracket in place. The old module will then lift right out.
- Install the New Module: Seat your new, pre-programmed TCM in place and secure it with the mounting hardware. Reconnect the electrical connectors, ensuring they click securely into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a minute. While our programming resolves most issues, it’s good practice to use a basic scan tool to clear any stored DTCs from the computer’s memory.
Verified Compatibility for Your GM Vehicle
While this is a perfect fit for the 2007-2009 Tahoe Transmission Module replacement, this T42 unit is compatible with a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. It is a direct replacement for part numbers 24243901, 24252114, 24234503, and others listed in our interchange data. Please see the detailed list below:
Partial Fitment List:
- Chevrolet Tahoe (2007-2009) – next to battery, w/o auxiliary oil cooler pump
- Chevrolet Silverado 1500 (2007-2013) – next to battery
- GMC Yukon / Yukon XL 1500 (2007-2009) – next to battery
- GMC Sierra 1500 (2007-2013) – next to battery
- Chevrolet Suburban 1500 (2007-2008) – next to battery
- Chevrolet Avalanche 1500 (2007-2008) – next to battery
- And many more GM cars, trucks, and SUVs from 2006-2014.
What does ‘VIN Programmed’ actually mean?
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it communicates perfectly with your vehicle’s engine computer and other systems, just like an OEM part installed at a dealership, but without the extra cost and appointment.
Do I need any special tools for this installation?
No special tools are required. A basic socket set to remove the module’s mounting hardware and a flat-head screwdriver to help with the connector clips are typically all you need. The entire process usually takes less than 30 minutes.
Is there a core charge? Do I need to send my old part back?
No, there is absolutely no core charge. You can keep your old module or dispose of it at your convenience. We want to make the repair process as simple and hassle-free as possible.
Will this fix a P0700 code?
A P0700 is a generic code indicating the TCM has detected a fault. Often, replacing a faulty TCM will resolve the underlying issue causing the P0700. However, it’s always best to scan for more specific codes (like P0751, P0756, etc.) to confirm the diagnosis.
What is the warranty on this module?
This module comes with a one-year warranty, covering any defects in materials or workmanship. We stand behind the quality and reliability of our programmed electronics.