If your 2007-2009 Chevrolet Tahoe is suffering from harsh shifting, getting stuck in gear, or throwing transmission-related trouble codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen these symptoms countless times, and a faulty Transmission Control Module (TCM) is often the culprit. This T42 TCM, part number 24238856, is the reliable, long-term solution you need to restore your SUV’s performance and peace of mind.
This isn’t just a replacement part; it’s a complete solution. We pre-program this module to your Tahoe’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures it communicates flawlessly with your vehicle’s Powertrain Control Module (PCM) and other systems right out of the box. You get to skip the expensive trip to the dealership for programming, making this a straightforward repair for both professional mechanics and dedicated DIYers.
A Technician’s Notebook
I recently had a 2008 Tahoe in my bay that the owner described as ‘possessed.’ It would slam into gear from a stop and refuse to shift past 3rd on the highway. The check engine light was on, and my scan tool pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). While the solenoid code pointed to a potential internal issue, my experience with these GM platforms told me to check the TCM first. The module’s internal logic can fail, sending incorrect signals to perfectly good solenoids. After swapping in a VIN-programmed TCM like this one, the shifting was buttery smooth, and all codes were cleared. It saved the customer from a costly and unnecessary transmission teardown.
Is Your Tahoe Exhibiting These Transmission Issues?
A failing 2007-2009 Tahoe TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs attention:
- âś” Harsh, banging shifts or delayed gear engagement.
- âś” The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear only).
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0751, P0752, or other solenoid-related faults.
- âś” Inconsistent or no upshifting/downshifting.
- âś” A noticeable decrease in fuel economy.
- âś” The transmission feels like it’s slipping between gears.
A Straightforward Guide to Installation
Replacing the TCM on your Tahoe is a job you can tackle in your own garage in under 30 minutes. On the 2007-2009 Tahoe, the TCM is conveniently located in the engine compartment, right next to the battery.
- 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: Find the TCM mounted on a bracket next to the battery. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small flathead screwdriver to release the locking tabs if necessary. 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 negative battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD-II scan tool to clear any stored fault codes from the vehicle’s memory. Start the engine and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
While this listing is focused on the 2007-2009 Tahoe TCM, this module is compatible with a wide array of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is a direct replacement for multiple part numbers, including 24242391, 24234503, 24252114, and 24238856. Please see the detailed fitment list below:
- Chevrolet Tahoe: 2007, 2008, 2009 (w/o auxiliary oil cooler pump)
- Chevrolet Silverado 1500: 2007-2013 (w/o hybrid)
- GMC Yukon / Yukon XL 1500: 2007-2009 (w/o auxiliary oil cooler pump)
- GMC Sierra 1500: 2007-2013 (w/o hybrid)
- Chevrolet Avalanche 1500: 2007-2008
- Chevrolet Suburban 1500: 2007-2008
- Cadillac DTS: 2006-2011
- Buick Lucerne: 2006-2011
- Chevrolet Impala: 2006-2011
- Hummer H3: 2008-2010
- …and many more GM models from 2006-2014. Please verify your part number or contact us with your VIN.
Frequently Asked Questions
Do I need to do any programming after I install this TCM?
No. We handle all the programming for you. This module is flashed with your vehicle’s VIN and the latest GM software updates before shipping, making it a true plug-and-play installation.
What is the warranty on this part?
This Transmission Control Module comes with a one-year, hassle-free warranty, giving you confidence in your repair.
Will this fix a P0700 check engine light code?
Yes, in most cases. A P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the fault, replacing it with our pre-programmed unit will resolve the code and the underlying issue.
Is a core charge required?
No, there is no core charge for this part. You can keep your old module without needing to send it back, saving you time and shipping costs.