If your 2007-2009 Chevrolet Tahoe is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’re likely dealing with a failed Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfectly good SUV. This isn’t just an annoyance; it’s a reliability issue that can leave you stranded. This T42 Transmission Control Module, part number 24256960, is the definitive, hassle-free solution to restore your vehicle’s performance and your peace of mind.
The biggest headache with TCM replacement has always been the mandatory, and often expensive, trip to the dealership for programming. We eliminate that step entirely. By providing your vehicle’s VIN at checkout, we program the module with the latest GM software updates specifically for your Tahoe. This means it arrives at your door ready for a true plug-and-play installation, saving you hundreds in dealer fees and vehicle downtime. This isn’t just a part; it’s a complete repair solution for your 2007-2009 Tahoe TCM issues.
A Technician’s Notebook: The Intermittent Limp Mode Case
A few months back, a 2008 Tahoe was towed into my bay. The owner was frustrated—the truck would randomly refuse to shift past 2nd gear (classic limp mode) and had a persistent Check Engine Light. He’d already replaced two shift solenoids at another shop, but the problem kept coming back. A quick scan showed a P0700 (Transmission Control System Malfunction) and an intermittent solenoid circuit code. Instead of throwing more parts at it, we checked the TCM wiring and found it solid. The intermittent nature of the fault pointed directly to the module’s internal logic failing under heat. We installed one of our VIN-programmed T42 modules, and the problem was solved permanently. It’s a textbook example of why correctly diagnosing the electronic ‘brain’ is key.
Is Your Tahoe Exhibiting These Telltale Signs?
A failing TCM will give you clear warnings. If you’re experiencing any of the following, it’s time to consider a replacement:
- âś” Harsh, banging shifts or delayed gear engagement.
- âś” The vehicle is stuck in a single gear (often called “limp mode”).
- âś” Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-specific codes.
- âś” Complete failure to upshift or downshift, leading to poor acceleration and fuel economy.
- âś” Unpredictable electrical behavior related to the transmission.
Your 30-Minute Path to a Smooth Ride
One of the best features of this module is its straightforward installation. You don’t need to be a master mechanic to get this done in your own driveway. For most 2007-2009 Tahoes, the TCM is located right next to the battery in the engine compartment.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Old TCM: Find the module, typically mounted on a bracket next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small 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’ll hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Compatibility for Your GM Vehicle
While this is the perfect solution for the 2007-2009 Tahoe TCM, this T42 module is also compatible with a wide range of other GM cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is a direct replacement for multiple part numbers, including 24242391, 24234503, and 24252114.
- âś” Chevrolet Tahoe/Suburban/Avalanche (2007-2009)
- âś” GMC Yukon / Yukon XL (2007-2009)
- âś” Chevrolet Silverado 1500 (2007-2013)
- âś” GMC Sierra 1500 (2007-2013)
- âś” Chevrolet Express / GMC Savana Vans (2006-2014)
- âś” Hummer H3 (2008-2010)
- âś” And many other GM models from 2006-2014.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means the module arrives ready to install with no extra steps. We load the specific software for your vehicle’s exact configuration using your VIN, so it communicates perfectly with your engine and transmission right out of the box, avoiding a costly trip to the dealership.
Do I need to send my old TCM back?
No, there is no core charge or need to return your old part. You can dispose of it or keep it, making the process simpler and faster for you.
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. In many cases, a failing TCM is the root cause. Replacing the module with our programmed unit often resolves the P0700 code and any accompanying specific transmission codes.
Is this a difficult part to install myself?
Not at all. For most DIYers with basic hand tools, this is a job that takes less than 30 minutes. The module is easily accessible in the engine bay on most trucks and SUVs.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty, giving you confidence and protection in your repair.