Restore Full Command of Your Truck’s Drivetrain
Is your Sierra Denali flashing a “Service 4WD” message? Are you stuck in one gear, unable to switch between 2WD and 4WD? You’re not just losing convenience; you’re losing the core capability of your heavy-duty truck. The Transfer Case Control Module (TCCM) is the electronic brain of your four-wheel-drive system, and when it fails, it can sideline your vehicle. This isn’t just an annoyance—it’s a critical failure that can leave you unprepared for rough terrain or bad weather.
As a technician with over two decades of experience, I’ve seen countless GM trucks roll into the bay with these exact symptoms. The problem is often a faulty TCCM, but the real headache for most owners is the repair process. A new module from the dealership requires expensive, specialized programming. Our solution eliminates that step entirely. We provide a reliable replacement TCCM, part number 24243084, that arrives at your door fully programmed to your truck’s specific VIN. It’s a true plug-and-play fix that puts you back in control.
A Technician’s Notebook: The TCCM Communication Breakdown
I remember a 2013 Sierra 2500HD that came in, stuck in 4-HI. The owner, a contractor, couldn’t get it to shift back to 2WD, which was killing his fuel mileage on the highway. His dash selector switch was dead, and the “Service 4WD” light was glaring at him. A quick scan with a professional tool showed a U0102 code – “Lost Communication with Transfer Case Control Module.” We checked the wiring and fuses, which were all fine. This pointed directly to an internal failure in the TCCM, a common issue caused by voltage spikes or simple component aging. He was worried about a multi-day repair and a huge bill from the dealer for the module and programming. We solved his problem in under an hour with a VIN-programmed module just like this one. He drove away with a fully functional 4×4 system for a fraction of the quoted dealership cost.
Common Signs of a Failing TCCM
If your truck is experiencing any of the following, a faulty TCCM is the most likely culprit. This module is the solution for clearing these persistent issues and associated diagnostic trouble codes (DTCs).
- ✔ “Service 4WD” or “Service Four Wheel Drive” message on the instrument cluster.
- ✔ Inability to shift the transfer case into or out of 4-HI, 4-LO, or 2-WD.
- ✔ The 4WD selector switch lights are off or flash without engaging.
- ✔ Vehicle feels like it’s binding or hopping during turns on dry pavement.
- ✔ Diagnostic codes stored, such as C0327, C0374, or U0102.
A Straightforward Guide to Installation
You don’t need to be a master mechanic to install this part. With basic hand tools, you can have your 2011-2014 Sierra Denali TCCM replaced in under 30 minutes. Our pre-programmed module makes it a simple swap.
- 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 located on the driver’s side, up under the dashboard, 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 from the old module. They have locking tabs that need to be depressed. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, VIN-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 and reconnect the negative battery terminal. Start the truck and test the 4WD selector switch to confirm the repair is complete. The “Service 4WD” light should be gone.
Guaranteed Fitment for Your GM Truck or SUV
This module is a direct replacement for a wide range of GM vehicles. Please provide your VIN upon purchase to ensure we load the correct software for your specific configuration. This part is compatible with the following part numbers: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, and 24252878.
AVALANCHE 1500 (2008-2013)
SIERRA/SILVERADO 1500 (2007 New Body Style – 2013)
SIERRA/SILVERADO 2500 & 3500 (2007 New Body Style – 2014)
SIERRA DENALI (2007-2010)
SIERRA DENALI 2500/3500 (2011-2014)
SUBURBAN 1500 (2008-2014)
SUBURBAN 2500 (2008-2013)
TAHOE (2008-2014)
YUKON & YUKON XL 1500 (2007-2014)
YUKON XL 2500 (2008-2013)
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
It means we load your vehicle’s specific software onto the module using your VIN before we ship it. This makes the part ready to install right out of the box, with no need for a trip to the dealer for expensive programming.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we have this information.
Will this fix my ‘Service 4WD’ light?
In the vast majority of cases, yes. The ‘Service 4WD’ light is most commonly triggered by a failed TCCM or a faulty transfer case encoder motor (which is often replaced at the same time). This module resolves all issues related to TCCM failure.
Is this a difficult part to install myself?
Not at all. For most DIYers with basic tools, this is a 30-minute job. The module is typically located under the driver’s side dashboard and is held in by a few bolts and electrical connectors.
Is this compatible with other part numbers?
Yes, this module is a direct replacement for a long list of GM part numbers, including 24261367, 12588096, 24243084, 24252878, and several others listed in the description. It’s a comprehensive solution.