If you’re staring at that frustrating ‘Service 4WD’ light on the dash of your 2011-2014 Sierra Denali 3500, you’ve come to the right place. As a technician with over two decades in the bay, I know how critical a fully functional four-wheel-drive system is, especially in a heavy-duty truck built for tough jobs and challenging conditions. A faulty Transfer Case Control Module (TCCM) can leave you stranded in the wrong drive mode, unable to switch when you need it most. This isn’t just an inconvenience; it’s a reliability issue that compromises your truck’s capability.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the biggest headache out of the equation: programming. Before this module ships, we flash it with the latest GM software, perfectly matched to your truck’s specific Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership for programming. You get a part that’s truly plug-and-play, restoring the intelligent control of your 4×4 system right out of the box. This is the same reliable fix I’ve provided to hundreds of truck owners to get them back on the road and off the beaten path with confidence.
A Technician’s Notebook
I remember a customer with a 2012 Sierra 2500 HD, a contractor who relied on his 4WD for accessing muddy job sites. His truck was stuck in 2WD, and the ‘Service 4WD’ light was on. He’d been to the dealer and was quoted over $700 for a new TCCM and the required programming labor. He was frustrated, facing downtime he couldn’t afford. We diagnosed a failed TCCM (a common issue due to voltage spikes or internal circuit failure). Instead of the dealer route, we ordered one of these pre-programmed modules. It arrived two days later, already flashed to his VIN. The physical swap took me less than 15 minutes. He was back in business for a fraction of the cost, his 4WD system working flawlessly. That’s the power of solving the whole problem, not just selling a part.
Is Your Truck’s 4WD Acting Up?
A failing TCCM can manifest in several ways. If you’re experiencing any of these, it’s a strong indicator that this module is the solution you need:
- ✔ ‘Service 4WD’ or ‘Service Four Wheel Drive’ message on the instrument cluster.
- ✔ Inability to shift between 2HI, 4HI, 4AUTO, or 4LO.
- ✔ The selector switch lights don’t illuminate or flash without engaging.
- ✔ The 4×4 system seems to engage or disengage on its own.
- ✔ Diagnostic Trouble Codes (DTCs) stored in the system, such as U0102 (Lost Communication With TCCM) or codes related to the transfer case encoder motor circuit (e.g., C0327).
Straightforward DIY Installation Guide
One of the best parts about this pre-programmed module is how simple the physical installation is. No special tools are required, making this a perfect job for a DIY enthusiast. Here’s a general guide:
- Safety First: Always disconnect the negative terminal from your truck’s battery before working on electrical components.
- Locate the Module: On most 2011-2014 Sierra Denali 3500 trucks, the TCCM is located under the driver’s side of 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 or unclip the old TCCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed TCCM in the same location. Securely plug in the electrical connectors—you should hear or feel a click.
- Final Steps: Reinstall any trim panels you removed. Reconnect the negative battery terminal. Start the truck and test the 4WD selector switch to confirm proper operation. The ‘Service 4WD’ light should be off.
Verified Fitment for Your GM Truck or SUV
This module is a direct replacement for part number 24243085 and is compatible with a wide range of GM vehicles. Please confirm your model and year below. This part is compatible with the following original equipment part numbers: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24249095, 24252878.
- GMC Sierra 1500/2500/3500: 2007 (New Body Style) – 2014
- GMC Sierra Denali 1500/2500/3500: 2007 – 2014
- GMC Yukon / Yukon XL: 2007 – 2014
- Chevrolet Silverado 1500/2500/3500: 2007 (New Body Style) – 2014
- Chevrolet Avalanche: 2008 – 2013
- Chevrolet Suburban: 2008 – 2014
- Chevrolet Tahoe: 2008 – 2014
Frequently Asked Questions
Do I need to take this module to a dealer for programming?
No. The main benefit of our service is that we program the module to your vehicle’s VIN before we ship it. It arrives at your door ready for installation, saving you hundreds in dealership fees and hassle.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit VIN (Vehicle Identification Number). You can typically find this on your driver’s side door jamb sticker or on the dashboard viewable through the windshield.
Will this fix my ‘Service 4WD’ light?
In the vast majority of cases, a failed TCCM is the root cause of the ‘Service 4WD’ light and the inability to shift drive modes. If your vehicle’s symptoms match the ones described, this module is the correct and reliable fix.
Where is the TCCM located on my 2013 Sierra 3500?
On most GM trucks of this era, including your 2013 Sierra, the TCCM is mounted under the dashboard, on the driver’s side, typically to the left of the steering column. Access is usually straightforward after removing the lower dash cover.
Is this a used part?
This is a high-quality, inspected, and tested recycled OEM part. It is guaranteed to function correctly and has been updated with the latest software from GM for optimal performance and longevity.