If you’re staring at that frustrating “Service 4WD” light on the dash of your truck, you’re not alone. As a technician with over two decades of experience, I’ve seen countless Sierra and Silverado owners come into the shop with a four-wheel-drive system that’s completely unresponsive. The culprit is often a failed Transfer Case Control Module (TCCM). This small electronic box is the brain of your 4×4 system, and when it goes down, you lose the ability to shift into 4HI or 4LO, leaving your powerful HD truck unprepared for tough weather or job site conditions.
Don’t let a faulty module sideline your truck. This is a direct-replacement TCCM, part number 24261367, designed to restore full functionality to your vehicle. The best part? We eliminate the most expensive and time-consuming step of the repair. Before this module ships, we will program it with the latest GM software updates, specifically matched to your truck’s Vehicle Identification Number (VIN). This means no trip to the dealership for costly programming. It arrives at your door ready for a straightforward installation, making this a perfect job for a DIY enthusiast or a professional mechanic looking to save time.
From the Diagnostic Bay: A Common TCCM Failure
A few months back, a 2012 Sierra 3500 was towed in, stuck in 4HI. The owner had been hauling a heavy trailer and couldn’t disengage the 4WD. My scan tool couldn’t even communicate with the TCCM—a classic sign of internal failure. After locating the module on the driver’s side frame rail, I noticed the tell-tale signs of water intrusion around the connector. These modules are in a vulnerable spot, and over time, moisture can seep in and corrode the circuit board, causing shorts and communication breakdowns. This is why simply replacing the module with a quality, sealed unit is the only reliable, long-term fix.
Common Signs of a Failing TCCM
Not sure if the TCCM is your problem? If your Sierra Denali is showing these symptoms, a faulty module is the most likely cause. In my shop, these are the red flags I look for first:
- ✔ “Service 4WD” or “Service Four Wheel Drive” message on the instrument cluster.
- ✔ Inability to switch between 2WD, 4HI, or 4LO.
- ✔ The 4WD selector switch lights don’t illuminate or flash without engaging.
- ✔ The truck feels like it’s binding or hopping during turns on dry pavement (stuck in 4WD).
- ✔ Diagnostic Trouble Codes (DTCs) stored in the system, such as U0102 (Lost Communication with TCCM).
Your Straightforward TCCM Installation Guide
Replacing the 2011-2014 Sierra Denali 3500 TCCM is a manageable job you can do at home. Since this part comes pre-programmed, you’re skipping the hardest part. Just follow these steps:
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the Module: On most GM HD trucks of this era, the TCCM is mounted to the frame rail on the driver’s side, roughly below the driver’s door.
- Disconnect the Connectors: Carefully press the release tabs on the two large electrical connectors and pull them straight out from the module. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: The TCCM is typically held in place by two or three bolts. Remove these bolts and take the old module off the frame.
- Install the New Module: Mount your new, pre-programmed TCCM in the same location and secure it with the original bolts.
- Reconnect Everything: Firmly plug the electrical connectors back into the new module until they click into place. Reconnect your battery terminal.
- Final Check: Start the truck and test the 4WD selector switch. The lights should operate correctly, and you should hear the transfer case motor engage as you switch modes. The “Service 4WD” light should be gone.
Verified Fitment For Your GM Truck or SUV
This module is a direct replacement for a wide range of GM vehicles. It is compatible with original part numbers 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, and 24252878. Please confirm your vehicle is on the list below for guaranteed compatibility.
- AVALANCHE 1500: 2008-2013
- SIERRA 1500 PICKUP: 2007-2013
- SIERRA 2500 PICKUP: 2007-2014
- SIERRA 3500 PICKUP: 2007-2014
- SIERRA DENALI: 2007-2010
- SIERRA DENALI 2500: 2011-2014
- SIERRA DENALI 3500: 2011-2014
- SILVERADO 1500 PICKUP: 2007-2013
- SILVERADO 2500 PICKUP: 2007-2014
- SILVERADO 3500 PICKUP: 2007-2014
- SUBURBAN 1500/2500: 2008-2014
- TAHOE: 2008-2014
- YUKON & YUKON XL: 2007-2014
Frequently Asked Questions
Do I need to do any programming myself?
No. This module is fully programmed to your vehicle’s VIN before it is shipped. It is a true plug-and-play solution, saving you a trip to the dealer.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the part until we have this information to program it correctly.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part that has been programmed with the latest software for your vehicle.
Will this fix my ‘Service 4WD’ light?
In the vast majority of cases where the TCCM is at fault, yes. If the light is caused by another component, like the transfer case encoder motor or the selector switch, you will need to diagnose those parts separately.
What tools do I need for installation?
Basic hand tools are all that’s required. Typically, you’ll just need a socket set to remove the bolts holding the module to the frame and a wrench for the battery terminal. No special diagnostic equipment is needed.