Is your 2007-2010 Sierra Denali plagued by a stubborn “Service 4WD” light? Are you unable to switch between 2WD, 4-Hi, or 4-Lo, leaving you unprepared for changing road conditions? 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). This isn’t just an annoyance; it’s a critical failure that compromises your truck’s capability. This module is the solution—a direct-fit TCCM, part number 24252878, that arrives at your door fully programmed to your truck’s specific VIN.
The TCCM is the electronic brain of your 4×4 system. It takes your command from the dash switch and orchestrates the complex process of engaging or disengaging the front axle via the transfer case encoder motor. When it fails, communication breaks down, leaving your truck stuck and triggering diagnostic trouble codes. Our solution eliminates the biggest headache of this repair: the need for expensive dealership programming. We handle the programming for you before we ship, loading the latest GM software updates. This means you get a true plug-and-play part that restores function the moment it’s installed.
From the Diagnostic Bay: The Case of the Stuck Sierra
A customer brought in his ’09 Sierra Denali last winter, frustrated because the “Service 4WD” message was on and the truck was stuck in 4-Hi. He was worried about driving on dry pavement and causing damage to the drivetrain. A quick scan with my pro-level tool revealed code U0102 – Lost Communication with Transfer Case Control Module. After verifying power and ground at the module connector under the driver’s side dash, it was clear the TCCM itself was the culprit. These modules are a known failure point; I’ve personally replaced hundreds due to internal circuit board issues. We installed one of our pre-programmed modules, and within 15 minutes, the codes were clear, the 4WD selector worked perfectly, and the customer was back on the road with confidence. This is the exact, reliable fix we offer you.
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 4WD High, 4WD Low, or 2WD.
- ✔ Indicator lights on the 4WD selector switch are blinking or completely off.
- ✔ The vehicle feels like it’s binding or hopping during turns on dry pavement (stuck in 4WD).
- ✔ Diagnostic Trouble Codes (DTCs) such as U0102, C0327, or other communication errors are present.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- ✔ Locate the Module: The TCCM is typically located under the driver’s side of the dashboard, to the left of the steering column. 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. Then, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Bolt the new, pre-programmed TCCM into place and securely plug in all the electrical connectors. You should hear a click as they lock.
- ✔ Final Steps: Reinstall any dash panels you removed. Reconnect the negative battery terminal. Start the truck and test the 4WD selector switch to confirm full functionality.
Verified Vehicle Compatibility
This module is a guaranteed fit for a wide range of GM trucks and SUVs. Please verify your vehicle is on this list. This part replaces multiple original part numbers, including 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, and more.
- AVALANCHE 1500: 2008-2013
- SIERRA 1500 PICKUP: 2007 (New Body Style), 2008-2013
- SIERRA 2500/3500 PICKUP: 2007 (New Body Style), 2008-2014
- SIERRA DENALI: 2007-2010
- SIERRA DENALI 2500/3500: 2011-2014
- SILVERADO 1500 PICKUP: 2007 (New Body Style), 2008-2013
- SILVERADO 2500/3500 PICKUP: 2007 (New Body Style), 2008-2014
- SUBURBAN 1500/2500: 2008-2014
- TAHOE: 2008-2014
- YUKON / YUKON XL 1500: 2007 (Denali), 2008-2014
- YUKON XL 2500: 2008-2013
Frequently Asked Questions
What do I need to do after I purchase?
Simply reply to your order confirmation email with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it.
Is this really a plug-and-play part?
Yes. Because we program the module to your specific VIN before shipping, it requires no additional programming or setup. Just install it, and your 4WD system will be operational again.
Why is VIN programming so important for this part?
On these GM platforms, the TCCM must communicate correctly with the Engine Control Module (ECM), Body Control Module (BCM), and other systems. The VIN-specific software ensures all components recognize each other and function together as the factory intended.
Will this fix my “Service 4WD” light?
If the cause of the light is a failed TCCM, then yes, this part is the correct solution. Common symptoms pointing to the TCCM are listed above. We always recommend a proper diagnosis to confirm the TCCM is the point of failure.
Where is the TCCM located on my 2009 Sierra Denali?
The Transfer Case Control Module is mounted under the driver’s side dashboard, typically to the left of the steering column and above the emergency brake pedal assembly.