Restore Full Control of Your Truck’s 4WD System
If you’re staring at a persistent “Service 4WD” light on your 2008-2013 Chevrolet Avalanche 1500, you’re not alone. As a technician with over two decades of experience, I’ve seen this exact issue countless times. The Transfer Case Control Module (TCCM) is the electronic brain of your four-wheel-drive system, and when it fails, it can leave you stuck in two-wheel drive—often right when you need 4WD the most. This isn’t just an inconvenience; it’s a matter of vehicle capability and safety in poor weather or off-road conditions.
This replacement TCCM, part number 24243085, is the definitive solution. We take the guesswork and extra cost out of the repair. Simply provide your vehicle’s VIN at checkout, and our experts will program the module with the latest GM software updates specifically for your truck. It arrives at your door ready for a direct, plug-and-play installation, eliminating the need for an expensive trip to the dealership for programming. This is the same reliable fix I’d perform in my own service bay.
From the Diagnostic Bay
I remember a customer with a 2011 Sierra 1500 who brought his truck in just before a big winter storm was forecast. His 4WD selector switch was completely unresponsive. He was worried he wouldn’t be able to get to his rural home safely. A quick scan showed communication loss with the TCCM. The original module had failed internally, a common issue due to heat cycles and vibration under the dash. We installed a pre-programmed module just like this one, and he was back on the road with fully functional 4WD in under an hour. It’s a simple part that makes a world of difference in your truck’s readiness.
Common Signs of a Failing TCCM
- ✔ The “Service 4WD” or “Service Four Wheel Drive” message is illuminated on your dash.
- ✔ Inability to switch between 2WD, 4-High, or 4-Low.
- ✔ The 4WD selector switch lights do not illuminate or blink continuously.
- ✔ The vehicle is stuck in one drive mode (e.g., 4WD Low or 2WD).
- ✔ Diagnostic Trouble Codes (DTCs) are stored, such as C0327, C0374, or U0102 (Lost Communication with TCCM).
A Straightforward Guide to Installation
Installing your new 2008-2013 Avalanche 1500 TCCM is a job most DIYers can handle with basic tools. It’s typically located behind the lower dash panel on the driver’s side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Access the Module: Remove the lower dash panel (knee bolster) below the steering wheel. It’s usually held in by a few screws or clips.
- Locate the Old TCCM: Find the existing module. It’s a small black box with several electrical connectors. It may be mounted to a bracket.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old module. Then, unbolt or unclip it from its mounting location.
- Install the New Module: Mount your new, pre-programmed TCCM in the same location and securely reconnect all electrical harnesses.
- Final Steps: Reinstall the lower dash panel and reconnect the negative battery terminal. Start the vehicle and test the 4WD selector switch to confirm proper operation.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM trucks and SUVs. It is compatible with the following part numbers: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, and 24252878. Please confirm your vehicle is on the list below.
- Chevrolet Avalanche 1500: 2008-2013
- Chevrolet Silverado 1500/2500/3500: 2007 (New Body Style), 2008-2014
- Chevrolet Suburban 1500/2500: 2008-2014
- Chevrolet Tahoe: 2008-2014
- GMC Sierra 1500/2500/3500: 2007 (New Body Style), 2008-2014
- GMC Sierra Denali / 2500 / 3500: 2007-2014
- GMC Yukon / Yukon XL 1500 / Yukon XL 2500: 2007-2014
Frequently Asked Questions
Why do I need to provide my VIN?
Your VIN is essential for us to program the TCCM with the correct GM software and vehicle-specific calibrations. This ensures it communicates perfectly with your truck’s other systems, like the engine and transmission, for seamless 4WD operation right out of the box.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills, this is a very manageable DIY repair. The module is typically located in an accessible spot under the driver’s side dashboard. No special tools are required, and since it’s pre-programmed, you save a trip to the dealer.
What happens if I don’t replace a faulty TCCM?
Ignoring a bad TCCM means your four-wheel-drive system will remain inoperable. This can be a significant safety concern in snow, ice, or muddy conditions and can prevent you from using your truck to its full potential for towing or off-road activities.
Will this part fix my ‘Service 4WD’ light?
In the vast majority of cases where the TCCM is the root cause, yes. This module is the most common failure point for the symptoms listed. However, we always recommend a proper diagnosis to rule out other issues like a faulty transfer case encoder motor or selector switch.
Is this a new or used part?
This is a high-quality, inspected, and tested used component that is guaranteed to function correctly. Each module is programmed with the latest software available from GM, ensuring reliable performance and longevity.