Restore Your Truck’s 4×4 Capability the Easy Way
As a technician with over two decades of experience, I’ve seen countless GM truck owners frustrated by that dreaded ‘Service 4WD’ light. One minute your four-wheel drive is your most trusted feature, and the next, it’s a useless switch on the dash. The problem often traces back to a failed Transfer Case Control Module (TCCM), the electronic brain of your 4×4 system. When it fails, you can get stuck in one mode, hear unsettling noises, or lose the ability to shift into 4HI or 4LO entirely. This isn’t just an inconvenience; it’s a loss of the core capability you paid for.
This TCCM, part number 24243085, is the definitive, hassle-free solution. We take all the guesswork and dealership expense out of the equation. Before this module ever leaves our facility, we program it with the latest GM software, specifically matched to your truck’s Vehicle Identification Number (VIN). This means when it arrives at your door, it’s a true plug-and-play part. No need for expensive scan tools or a costly trip to the dealer for programming. You get a reliable part that restores full function to your truck’s drivetrain.
From the Diagnostic Bay: The Case of the Stuck 4×4
I remember a 2011 Sierra 2500HD that came into the shop. The owner used it for plowing, and his 4WD system was completely unresponsive. The selector switch lights wouldn’t even come on. He was worried the transfer case itself was shot—a multi-thousand-dollar repair. After a quick scan, I found a U0102 code: ‘Lost Communication with Transfer Case Control Module.’ Instead of a complex wiring chase, we started with the most common culprit. The original TCCM, located under the driver’s side dash, had failed internally. We installed one of our pre-programmed modules, and within 10 minutes, the 4×4 system was shifting perfectly. The customer saved a fortune and got his work truck back in service the same day.
Is Your Truck Showing These Symptoms?
A failing TCCM can cause a range of issues that are often misdiagnosed. If you’re experiencing any of the following, this module is the likely solution for your 2007-2014 Sierra 2500 TCCM problems:
- ✔ ‘Service 4WD’ or ‘Service Four Wheel Drive’ message on the instrument cluster.
- ✔ Inability to shift the transfer case between 2HI, 4HI, Auto, or 4LO.
- ✔ The 4WD selector switch lights are inoperative or flashing.
- ✔ Getting stuck in a single drive mode (e.g., stuck in 4WD).
- ✔ Diagnostic Trouble Codes (DTCs) such as C0327, C0398, or U0102 stored in the system.
- ✔ A noticeable delay or grinding sound when attempting to engage 4WD.
A Straightforward Guide to Installation
Replacing the TCCM on these GM trucks is a job most DIYers can handle in under 30 minutes with basic tools. Because our module comes pre-programmed, you skip the hardest part. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: The TCCM is typically located on the driver’s side, up under the dashboard, often bolted to a metal bracket to the left of the steering column.
- Remove the Old Module: You may need to remove a lower dash panel for easier access. Unplug the electrical connectors by depressing their locking tabs. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed TCCM into place. Securely plug in the electrical connectors—you should hear a ‘click’ as they lock.
- Final Steps: Reinstall any trim panels you removed. Reconnect the negative battery terminal. Start the truck and test the 4WD selector switch to confirm proper operation. Enjoy your fully functional four-wheel drive!
Guaranteed Fitment for Your GM Truck or SUV
This module is a direct replacement for a wide range of General Motors vehicles. Please verify your model and year below. This is the correct part for a 2007-2014 Sierra 2500 TCCM and is also compatible with part numbers 24261367, 12588096, 24239190, and others listed in the original description.
- Avalanche 1500: 2008-2013
- Sierra 1500/2500/3500: 2007 (New Body Style), 2008-2014
- Sierra Denali 1500/2500/3500: 2007-2014
- Silverado 1500/2500/3500: 2007 (New Body Style), 2008-2014
- Suburban 1500/2500: 2008-2014
- Tahoe: 2008-2014
- Yukon & Yukon XL 1500/2500: 2007-2014
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the TCCM with the exact software and calibrations specific to your truck’s options. This ensures seamless communication with other vehicle systems and guarantees it works right out of the box.
Is any additional programming required after installation?
No. This is the biggest benefit of our service. The module arrives fully programmed and ready for installation. You will not need to visit a dealer or use a special scan tool.
What does the TCCM actually do?
The Transfer Case Control Module acts as the computer for your 4WD system. It takes the input from your selector switch and commands the transfer case shift motor to engage or disengage the different drive modes.
Will this fix a ‘Service 4WD’ light?
In the vast majority of cases, yes. A faulty TCCM is the most common cause of this warning light on 2007-2014 GM trucks. If the module has failed, replacing it with our programmed unit is the direct solution.
Where is this module located on my 2012 Sierra 2500?
On most Sierra and Silverado models from this generation, the TCCM is mounted under the driver’s side dashboard, to the left of the steering column. It’s a black plastic box with several electrical connectors.
Is this compatible with multiple part numbers?
Yes, this module replaces numerous original GM part numbers, including 24243085, 24261367, 12588096, 24241143, and several others, ensuring wide compatibility.