Restore Your Truck’s Four-Wheel Drive with a Plug-and-Play Solution
Is your truck’s “Service 4WD” light glaring at you from the dashboard? Are you stuck in two-wheel drive, unable to shift into 4HI or 4LO when you need it most? As a technician with over two decades of experience, I’ve seen this exact issue hundreds of times on GM trucks. The problem is almost always a failed Transfer Case Control Module (TCCM). This isn’t just an annoyance; it’s a critical failure that compromises your truck’s capability in bad weather, on the job site, or off-road. Don’t let a faulty module leave you stranded.
This TCCM is the definitive, hassle-free fix. Unlike parts you’d get from a local store or salvage yard, this module arrives at your door fully programmed with the latest GM software updates. We use your vehicle’s VIN to ensure the programming is a perfect match, eliminating the need for an expensive trip to the dealership. This means no surprise programming fees and no waiting for an appointment. You get a reliable part that’s ready for immediate installation, getting your heavy-duty truck back to full strength quickly and affordably.
From the Diagnostic Bay
I remember a customer with a 2011 Sierra 2500 who was convinced he needed a new transfer case motor. He had already spent a weekend replacing the encoder motor ring, a common but often misdiagnosed fix. His 4WD selector switch lights would flash, but nothing would happen. He brought it to my shop, frustrated. After a quick scan, I saw communication error codes pointing directly to the TCCM. The module wasn’t sending the right signals. We swapped in a pre-programmed Sierra 3500 TCCM (the same one used in the 2500), and within 15 minutes, the 4WD system was shifting perfectly. He could have saved himself a whole weekend of frustration and a few hundred dollars by diagnosing the electronics first. It’s a classic case of the ‘brain’ failing, not the ‘muscle’.
Is Your Truck Showing These Symptoms?
A failing TCCM can manifest in several ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ “Service 4WD” or “Service Four Wheel Drive” message on the dash.
- ✔ Inability to shift between 2WD, 4WD High, and 4WD Low.
- ✔ Selector switch lights are off, flashing, or don’t correspond to the selected mode.
- ✔ Grinding or clunking noises during attempted shifts.
- ✔ Diagnostic Trouble Codes (DTCs) stored in the system, such as C0306, C0321, C0327, C0374, or U-series communication codes.
A Straightforward Guide to Installation
Replacing the TCCM is a job most DIYers can handle in under 30 minutes with basic hand tools. It’s typically located under the driver’s side of the dashboard, near the steering column.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the Module: On most GM trucks of this era, the TCCM is mounted to a bracket to the left of the steering column. You may need to remove a lower dash panel for access.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock in.
- Reconnect 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 hear the transfer case motor engage as you cycle through the modes. The “Service 4WD” light should now be off.
Guaranteed Fitment for Your GM Truck or SUV
This module is a direct replacement for part number 24249095 and is compatible with a wide range of vehicles. Please verify your model and year below. This module works as a direct replacement for many other part numbers, including: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, and 24252878.
- Avalanche 1500: 2008-2013
- Sierra 1500/2500/3500 Pickup: 2007 (New Body Style), 2008-2014
- Sierra Denali (1500/2500/3500): 2007-2014
- Silverado 1500/2500/3500 Pickup: 2007 (New Body Style), 2008-2014
- Suburban 1500/2500: 2008-2014
- Tahoe: 2008-2014
- Yukon / Yukon XL 1500/2500: 2007-2014
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as the programming is specific to your truck.
Yes. Because we program the module to your VIN before shipping, it arrives ready to be installed without any additional steps. Once installed, it will communicate correctly with your truck’s other systems, just like the original part.
This module replaces a long list of original GM part numbers. As long as your vehicle is listed in our compatibility chart, this module will function correctly, even if the number on your old part is different. We load the correct software for your specific vehicle.
In the vast majority of cases, a faulty TCCM is the cause of the “Service 4WD” light and shifting issues. Replacing it with this pre-programmed unit is the correct and reliable repair for that failure.
On a 2012 Sierra 3500, the TCCM is located on the driver’s side, up under the dashboard and to the left of the steering column. You will likely need to remove the plastic knee bolster panel to gain clear access to it.