Regain Control of Your 4WD System and Eliminate Annoying Dash Lights
Is that frustrating “Service 4WD” light staring back at you from the dash of your Yukon, Sierra, or Silverado? Are you unable to switch between 2WD and 4WD, leaving you unprepared for bad weather or tough terrain? You’ve likely pinpointed the problem: a failing Transfer Case Control Module (TCCM). As a technician with over two decades of experience, I’ve seen this exact issue hundreds of times. The TCCM is the brain of your 4×4 system, and when it fails, it can leave you stranded in the wrong drive mode. This isn’t just an inconvenience; it’s a matter of vehicle capability and safety.
This replacement TCCM, part number 24243085, is the definitive solution. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific VIN with the latest GM-approved software. This means you can skip the expensive trip to the dealership for programming. It arrives at your door ready for a straightforward, plug-and-play installation, restoring full functionality to your truck or SUV’s four-wheel-drive system.
A Technician’s Notebook: The Misleading Encoder Motor
I remember a 2011 Sierra 2500 that came into the shop. The owner had already replaced the transfer case encoder motor, a common guess, but the “Service 4WD” light was still on and it wouldn’t shift. He was frustrated and out a few hundred dollars. After hooking up my scan tool, I saw communication codes (U-codes) pointing directly to the module. The TCCM wasn’t talking to the rest of the truck. We installed a pre-programmed TCCM, and within 15 minutes, the system was fully operational. His initial repair attempt wasn’t wrong, just incomplete. A faulty TCCM can often mimic an encoder motor failure, which is why proper diagnosis is key. This pre-programmed unit eliminates that diagnostic headache.
Is Your Truck Showing These Symptoms?
- ✔ “Service 4WD” or “Service Four Wheel Drive” message on the instrument cluster.
- ✔ Inability to shift the transfer case into or out of 4-High, 4-Low, or 2-Wheel Drive.
- ✔ The 4WD selector switch lights are inoperative or flashing.
- ✔ Audible clicking or grinding from under the vehicle when trying to engage 4WD.
- ✔ Stored Diagnostic Trouble Codes (DTCs) such as U0102 (Lost Communication with TCCM), C0327 (Encoder Circuit Malfunction), or C0398 (Encoder Circuit High).
- ✔ The vehicle feels like it’s stuck in 4WD, causing binding on dry pavement.
A Straightforward Guide to Your 2007-2014 Yukon TCCM Installation
- ✔ 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 of the dashboard, up and to the left of the steering column. You may need to remove the 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, pre-programmed TCCM into the same location. Ensure it is secure.
- ✔ Reconnect Everything: Plug the electrical harnesses firmly into the new module until they click into place. Reinstall the lower dash panel.
- ✔ Final Steps: Reconnect the negative battery terminal. Start the vehicle and test the 4WD selector switch to confirm that all modes engage correctly and the “Service 4WD” light is off.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM trucks and SUVs. Please verify your vehicle is on the list below. Upon purchase, we require your VIN to ensure perfect programming and compatibility. This part is a direct replacement for part numbers: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, 24252878.
- Avalanche 1500: 2008-2013
- Sierra 1500/2500/3500: 2007 (New Body Style), 2008-2014
- Sierra Denali / Denali 2500 / Denali 3500: 2007-2014
- Silverado 1500/2500/3500: 2007 (New Body Style), 2008-2014
- Suburban 1500/2500: 2008-2014
- Tahoe: 2008-2014
- Yukon / Yukon Denali: 2007-2014
- Yukon XL 1500 / Yukon XL 2500: 2007-2014
Frequently Asked Questions
Frequently Asked Questions
Why do you need my VIN number?
Your VIN is essential for us to program the TCCM with the exact software and calibrations for your vehicle’s specific options (engine, transmission, transfer case model). This ensures seamless, plug-and-play operation without needing a trip to the dealer.
Is this a difficult part for a DIYer to install?
Not at all. For most of the listed vehicles, the module is accessible under the driver’s side dash. With basic hand tools and our guide, most people can complete the swap in under an hour. The most important part—the programming—is already done for you.
Will this fix my ‘Service 4WD’ light for good?
If the TCCM is the root cause of the problem (which is very common for these symptoms), then yes, this module will resolve the issue and turn off the light. It’s always best to confirm the diagnosis, but a faulty TCCM is the leading culprit.
What if I install it and still have a problem?
While this module solves the vast majority of these cases, 4WD systems have other components like the encoder motor and front axle actuator. If a problem persists, it indicates another part may also be at fault. Our pre-programmed module confidently rules out the TCCM as the issue, allowing you or your mechanic to accurately diagnose the next step.
Is this a new or used part?
This is a high-quality, inspected, and tested component that is guaranteed to perform to OEM standards. It is loaded with brand-new GM software specific to your vehicle.