Is that frustrating ‘Service 4WD’ light glaring at you from the dash of your Sierra Denali 3500? Are you unable to switch between 2WD, 4-High, and 4-Low, leaving your truck’s capabilities compromised? As a technician with over two decades of experience, I’ve seen this exact issue hundreds of times. The problem often points directly to a failed Transfer Case Control Module (TCCM)—the electronic brain of your four-wheel-drive system.
Your heavy-duty truck was built for tough jobs and challenging conditions, and a non-functional 4×4 system is more than an inconvenience; it’s a liability. This replacement TCCM, part number 24240487, is the definitive solution. We take the guesswork and dealer-dependency out of the equation. Simply provide us with your vehicle’s VIN at checkout, and our experts will program the module with the latest GM-certified software specifically for your truck. It arrives at your door ready for a true plug-and-play installation, saving you hundreds in dealership programming fees and valuable time.
From the Diagnostic Bay: The Hidden Culprit
I remember a 2013 Sierra 3500 that came into my shop. The owner, a contractor, was frustrated because his 4WD was stuck on. He couldn’t make tight turns on pavement without the tires binding up. His selector switch was dead, and the ‘Service 4WD’ light was on. A quick scan pulled a U0102 code—Lost Communication with TCCM. After checking the fuses and wiring, I located the module. Just as I suspected, the casing showed faint signs of water intrusion from a leaky seal higher up. This is a common failure point I’ve diagnosed on over 50 of these GM trucks. Corrosion on the circuit board had fried the module. We replaced it with a pre-programmed unit like this one, and in under 30 minutes, his truck’s 4WD system was fully operational again. It’s not always a complex problem, but it requires the right part.
Is Your Truck Showing These Symptoms?
A failing TCCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2011-2014 Sierra Denali 3500 TCCM issues:
- ✔ ‘Service 4WD’ or ‘Service Four Wheel Drive’ message on the Driver Information Center (DIC).
- ✔ Inability to shift the transfer case into or out of 4WD High, 4WD Low, or 2WD.
- ✔ The 4WD selector switch lights are off or flash without engaging.
- ✔ The vehicle is stuck in a single 4WD mode.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as C0306, C0327, C0374, or communication codes like U0102.
A Straightforward Guide to Installation
One of the greatest benefits of this VIN-programmed module is its simple installation. You don’t need advanced diagnostic tools or a trip to the dealership. Here’s a general guide:
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the TCCM: On most GM trucks of this era, the module is located on the driver’s side, mounted to a bracket behind the lower dashboard panel, near the steering column.
- Remove Trim Panels: Carefully remove the necessary lower dash panels to gain access to the module. Usually, this involves a few screws or clips.
- Unplug and Unbolt: Disconnect the electrical connectors from the old TCCM. Then, remove the bolts or nuts holding it to the mounting bracket.
- Install the New Module: Mount your new, pre-programmed TCCM onto the bracket and securely fasten it. Reconnect the electrical connectors—they only fit one way.
- Reassemble and Reconnect: Reinstall the dash panels and reconnect the negative battery terminal.
- Test the System: Start the truck. The ‘Service 4WD’ light should be off. Test the selector switch to confirm you can shift between all 4WD modes properly.
Guaranteed Fitment for Your GM Truck or SUV
This module is a direct replacement for a wide range of GM vehicles. While this listing is focused on the 2011-2014 Sierra Denali 3500 TCCM, it is also compatible with the following models and part numbers, ensuring broad applicability and reliability. Compatible part numbers include: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, and 24252878.
- AVALANCHE 1500 (2008-2013)
- SIERRA & SILVERADO 1500/2500/3500 (2007 New Body Style – 2014)
- SIERRA DENALI (2007-2010)
- SIERRA DENALI 2500/3500 (2011-2014)
- SUBURBAN 1500/2500 (2008-2014)
- TAHOE (2008-2014)
- YUKON & YUKON XL 1500/2500 (2007-2014)
Frequently Asked Questions
Do I need to do any programming myself?
No. This is the biggest benefit of our service. We program the module to your specific VIN before shipping it. It arrives ready to install, saving you a trip to the dealer and their expensive programming fees.
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 module until we have this information to ensure correct programming.
Is this part difficult to install for a DIYer?
Not at all. For most DIY enthusiasts with basic hand tools, this is a very manageable job. The module is typically located behind the driver’s side lower dash and can be swapped out in under an hour.
What if this doesn’t fix my problem?
While the TCCM is the most common cause for these symptoms, other issues like a faulty encoder motor, selector switch, or wiring problems can exist. We recommend proper diagnosis. However, this programmed module eliminates a major variable and is a critical step in the diagnostic process.
Will this work for a different part number than 24240487?
Yes. This module is a direct replacement for a range of GM part numbers, including 24261367, 24241143, 24252878, and others listed in the description. Our programming ensures it functions correctly for your vehicle’s specific options.