Restore Your Truck’s 4WD Capability with a Plug-and-Play Solution
If you’re staring at that frustrating “Service 4WD” light on the dash of your Sierra 2500, you’re not alone. As a technician with over two decades of experience, I’ve seen hundreds of these GMT900 trucks come into the bay with a non-responsive four-wheel-drive system. The culprit is almost always a failed Transfer Case Control Module (TCCM). This small electronic box is the brain of your 4×4 system, and when it fails, it can leave you stuck in two-wheel drive right when you need traction the most.
The common dealership solution involves a new module and a hefty bill for programming. We eliminate that hassle. This TCCM, part number 24243085, arrives at your door fully programmed with the latest GM software, specifically flashed to your truck’s Vehicle Identification Number (VIN). This means no expensive trip to the dealer is required. It’s a direct, effective fix that you can perform yourself in under an hour.
A Technician’s Notebook
I remember a contractor who brought his ’11 Sierra 2500 HD to my shop in a panic. He was stuck in 4-Low after a muddy job site, and his truck was unusable on the highway. His selector switch was dead, and the dash was lit up with warnings. A quick scan showed communication loss with the TCCM. Instead of a complex wiring chase, my experience pointed straight to the module. We swapped in a VIN-programmed unit just like this one. In less than 30 minutes, the lights were off, the selector switch worked perfectly, and he was back on the road to his next job. It’s a simple part that can cause major headaches, and having a pre-programmed replacement is the fastest way to solve the problem.
Is Your Truck Showing These Symptoms?
- ✔ “Service 4WD” or “Service Four Wheel Drive” message on the instrument cluster.
- ✔ Inability to shift the transfer case into or out of 4HI, 4LO, or Auto modes.
- ✔ The 4WD selector switch lights are off or flash without engaging.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as C0306, C0327, C0374, or U0102 (Lost Communication with TCCM).
- ✔ A grinding or clunking noise when attempting to shift the transfer case.
A Straightforward Guide to Installation
Replacing your 2007-2014 Sierra 2500 TCCM is a simple job that most owners can handle with basic tools. This module is typically located behind the lower dash panel on the driver’s side.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Access the Module: Remove the lower dash panel (knee bolster) below the steering column. It’s usually held in by a few screws or clips.
- Locate the Old TCCM: Look for a small black or silver box with several electrical connectors. It will be mounted to a bracket.
- Unplug and Remove: Carefully disconnect all electrical connectors from the old module. Then, unbolt or unclip the module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed TCCM in the same location. Reconnect all the electrical connectors firmly until they click into place.
- Final Steps: Reinstall the lower dash panel and reconnect the negative battery terminal. Start the truck and test your 4WD selector switch. The warning light should be gone, and all functions restored.
Guaranteed Fitment for Your GM Truck or SUV
This module is a direct replacement for multiple part numbers and fits a wide range of General Motors vehicles. Please verify your model and year below. Upon purchase, we require your VIN to ensure perfect programming and compatibility.
Compatible Part Numbers: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, 24252878
- GMC Sierra 1500/2500/3500 & Denali: 2007 (New Body Style) – 2014
- Chevrolet Silverado 1500/2500/3500: 2007 (New Body Style) – 2014
- Chevrolet Avalanche 1500: 2008-2013
- Chevrolet Suburban 1500/2500: 2008-2014
- Chevrolet Tahoe: 2008-2014
- GMC Yukon & Yukon XL 1500/2500: 2007-2014
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
It means we load the module with the specific software and settings for your truck using its unique 17-digit VIN. This makes it a true plug-and-play part, saving you a trip to the dealership for expensive programming.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your vehicle’s VIN. We cannot ship the module until we receive this information.
Is this a difficult part to install myself?
Not at all. For most DIYers with basic hand tools, this is a 30-60 minute job. The module is located under the driver’s side dash and is easy to access and swap out.
Will this fix my ‘Service 4WD’ light?
In the vast majority of cases, a faulty TCCM is the cause of the ‘Service 4WD’ light and related symptoms on these trucks. This module is designed to be the definitive solution for that problem.
What is the main cause of TCCM failure?
From my experience, failures are often caused by voltage spikes, internal circuit board corrosion from moisture, or simply age-related electronic component failure.