Restore Your Truck’s 4WD System with a Plug-and-Play Solution
Is the dreaded “Service 4WD” light glaring at you from the dash of your Sierra? Are you stuck in two-wheel drive, unable to shift when you need it most? As a technician with over two decades of experience, I’ve seen this exact issue hundreds of times. The problem is almost always a failed Transfer Case Control Module (TCCM). This isn’t just an inconvenience; it’s a loss of the core capability and safety your truck was built for. This replacement TCCM, part number 24243085, is the definitive fix, arriving at your door fully programmed to your truck’s VIN with the latest GM software updates.
From the Diagnostic Bay: The Case of the Unresponsive 4×4
A customer brought in his 2011 Sierra 1500, frustrated because his 4×4 selector switch did nothing. He was planning a hunting trip and needed the 4WD for the back roads. When he pressed the buttons, there was no response—no clicks, no lights, nothing. My first step was to connect a professional scan tool. It couldn’t communicate with the TCCM, throwing a U0102 (Lost Communication With Transfer Case Control Module) code. After confirming the module had power and ground, the diagnosis was clear: internal TCCM failure. We ordered one of these pre-programmed modules. The next day, it was a 15-minute job to swap it out. The moment we reconnected the battery, the selector switch lights came on, and the truck shifted perfectly through 2HI, 4HI, and 4LO. He was able to make his trip without a costly, time-consuming visit to the dealer. That’s the power of a ready-to-install part.
Is Your Truck Showing These Symptoms?
A faulty TCCM can manifest in several ways. If you’re experiencing any of the following, this module is likely the solution you need. This is a common failure point I’ve diagnosed on countless GM trucks and SUVs in my shop.
- ✔ “Service 4WD” or “Service Four Wheel Drive” message on the instrument cluster.
- ✔ Inability to switch between 2WD, 4HI, and 4LO modes.
- ✔ The selector switch lights are off or flash and then go out.
- ✔ The vehicle is stuck in one drive mode (e.g., 4WD Low or 2WD).
- ✔ Audible clicking or grinding from the transfer case area during attempted shifts.
- ✔ Common Diagnostic Trouble Codes (DTCs) stored in the system, such as C0306, C0327, C0374, C0569, or U0102.
The Critical Advantage: Pre-Programmed for Your VIN
Replacing a modern electronic module isn’t just a mechanical swap. A blank TCCM from a dealer requires special tools and a software subscription to program it to your vehicle. This process can add hundreds of dollars and significant downtime to your repair. We eliminate that entire step. When you purchase from us, you provide your VIN, and our technicians program the module specifically for your Sierra 1500 TCCM. It arrives ready for a true plug-and-play installation, loaded with the most current software from GM for optimal performance and reliability.
A Straightforward Guide to Installation
You don’t need to be a master mechanic to replace your TCCM. With basic hand tools, you can get this done in your own driveway in under 30 minutes. Follow these steps for a successful installation.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the Module: On most 2007-2013 Sierra models, the TCCM is located on the driver’s side, up under the dashboard to the left of the steering column. You may need to remove the lower dash panel for easier access.
- Disconnect and Remove: The module is held in by a few small bolts or clips. Carefully unplug the electrical connectors (they have locking tabs you’ll need to press) and remove the old module.
- Install the New Module: Mount your new, pre-programmed TCCM in the same location. Securely plug in all the electrical connectors until they click into place.
- Power Up and Test: Reconnect the negative battery terminal. Turn the ignition to the ‘On’ position (without starting the engine) and test the 4WD selector switch. You should see the indicator lights function correctly and hear the transfer case motor engage as you switch modes.
Will This Fit My Truck or SUV?
This module is a direct replacement for a wide range of GM vehicles. Please verify your model and year against the list below. This part is compatible with the following part numbers: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, 24252878.
- Avalanche 1500: 2008-2013
- Sierra 1500 Pickup: 2007 (New Body Style, NQH), 2008-2013
- Sierra 2500/3500 Pickup: 2007 (New Body Style), 2008-2014
- Sierra Denali (1500/2500/3500): 2007-2014
- Silverado 1500 Pickup: 2007 (New Body Style, NQH), 2008-2013
- Silverado 2500/3500 Pickup: 2007 (New Body Style), 2008-2014
- Suburban 1500/2500: 2008-2014
- Tahoe: 2008-2014
- Yukon / Yukon XL 1500/2500: 2007-2014
Frequently Asked Questions
What exactly does the Transfer Case Control Module (TCCM) do?
The TCCM is the ‘brain’ of your four-wheel-drive system. It takes the input from your 4WD selector switch on the dash, processes it, and then sends commands to the encoder motor on the transfer case to shift the truck into the desired drive mode (e.g., 2WD, 4HI, 4LO).
Is this module really plug-and-play? Do I need to get it programmed?
No additional programming is required! This is the key benefit of our service. We use the Vehicle Identification Number (VIN) you provide at checkout to flash the module with the correct, vehicle-specific software from GM before we ship it. It arrives ready to install and function immediately.
Where is the TCCM located on my 2010 GMC Sierra 1500?
On the 2007-2013 GM truck and SUV platform, the TCCM is consistently found under the driver’s side dashboard, to the left of the steering column and above the emergency brake pedal. It’s typically a small black box with several electrical connectors.
What happens if I forget to provide my VIN after purchase?
Providing your VIN is a critical step. We cannot program and ship your module without it. Our customer service team will contact you to obtain the VIN, but this will delay the shipment of your order. Please provide it promptly to ensure fast delivery.
Will this fix a grinding noise when I try to shift into 4WD?
In many cases, yes. A faulty TCCM can send erratic signals to the transfer case motor, causing it to only partially engage, which results in grinding. If the TCCM is the root cause, this module will resolve that noise. However, severe grinding could also indicate a mechanical issue in the transfer case itself, so a full diagnosis is always recommended.