If you’re staring at that frustrating “Service 4WD” light on your 2011-2014 Sierra Denali 3500, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM trucks sidelined by a faulty Transfer Case Control Module (TCCM). It’s the electronic brain of your four-wheel-drive system, and when it fails, it can leave you stuck in one mode, unable to shift, or with a dashboard light that just won’t quit. This isn’t just an annoyance; it’s a loss of the core capability you rely on in your heavy-duty truck.
We offer a straightforward, reliable solution: a genuine GM TCCM, part number 24243085, that arrives at your door fully programmed to your truck’s specific VIN. We flash it with the latest, most stable software from General Motors before it ships. This means you can skip the expensive trip to the dealership for programming—a step that’s mandatory for a blank module. This is the definitive fix for a failing module, restoring full communication and control over your 4×4 system.
Case Study: A Tricky Diagnosis
I remember a 2012 Silverado 2500 that came into my shop. The owner was a contractor who couldn’t get his truck out of 4-HI. The selector switch lights were blank, and the dash showed the dreaded “Service 4WD” message. He was worried about a costly transfer case repair. After a quick scan, we found a U0102 code—Lost Communication with TCCM. Instead of a complex mechanical issue, the module itself was dead. We installed one of these pre-programmed units, and in under 15 minutes, all 4WD functions were restored. He was back on the job site the same day, having avoided a huge bill and days of downtime.
Is Your Truck Showing These Symptoms?
A failing TCCM will almost always give you clear warning signs. If you’re experiencing any of the following, this module is the likely culprit.
- âś” “Service 4WD” or “Service Four Wheel Drive” message on the instrument cluster.
- âś” Inability to switch between 2WD, 4-HI, and 4-LO.
- âś” 4WD selector switch lights are off or flash without engaging.
- âś” Vehicle is stuck in one drive mode (e.g., stuck in 4-HI or 4-LO).
- âś” Diagnostic Trouble Codes (DTCs) are present, such as C0327, C0387, C0398, or the classic U0102 (Lost Communication With TCCM).
A Straightforward Guide to Installation
Replacing the 2011-2014 Sierra 3500 TCCM is a job most DIYers can handle with basic tools. Because our module is pre-programmed, no further electronic work is needed.
- Safety First: Disconnect the negative terminal from your truck’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, often attached to a metal bracket. 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 the new, pre-programmed TCCM into place. Securely plug in the electrical connectors until they click, ensuring a solid connection.
- Final Steps: Reinstall any dash panels you removed and reconnect the negative battery terminal. Start the truck and test the 4WD selector switch to confirm all modes engage correctly. The “Service 4WD” light should be gone.
Verified Vehicle Compatibility
This module, programmed specifically for your vehicle, is a direct replacement for part number 24243085 and other compatible numbers. It fits a wide range of GM trucks and SUVs. Please confirm your vehicle is on the list below.
SIERRA 1500 PICKUP 07 (new style), 08-13
SIERRA 2500 PICKUP 07 (new style), 08-14
SIERRA 3500 PICKUP 07 (new style), 08-14
SIERRA DENALI 07-10
SIERRA DENALI 2500 11-14
SIERRA DENALI 3500 11-14
SILVERADO 1500 PICKUP 07 (new style), 08-13
SILVERADO 2500 PICKUP 07 (new style), 08-14
SILVERADO 3500 PICKUP 07 (new style), 08-14
SUBURBAN 1500 08-14
SUBURBAN 2500 08-13
TAHOE 08-14
YUKON & YUKON XL 1500 07-14
YUKON XL 2500 08-13
Frequently Asked Questions
How do I provide my VIN for programming?
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 your VIN, as the programming is essential for the module to function in your truck.
Do I need to take my truck to a dealer after installation?
No. The main benefit of our service is that the module arrives pre-programmed with the latest GM software matched to your VIN. This eliminates the need for any additional programming or calibration at a dealership, saving you time and money.
Is this a guaranteed fix for the ‘Service 4WD’ light?
The TCCM is the most common cause for this light and the associated symptoms. If your truck is showing signs like an inoperative selector switch or communication codes (like U0102), this module is the highly probable solution. However, we always recommend proper diagnosis to rule out other issues like a faulty encoder motor or selector switch.
What tools are required for installation?
You’ll typically only need basic hand tools, such as a socket set (7mm or 10mm sockets are common for dash panels and module bolts) and possibly a panel removal tool to avoid scratching your interior plastics. No special electronic equipment is needed.
What are the compatible part numbers for this module?
This module is a direct replacement for several part numbers, including: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, and 24252878.