Is a โService 4WDโ Light Ruining Your Drive?
Thereโs nothing more frustrating than looking down at your dash and seeing the dreaded โService 4WDโ message, especially when you rely on your truck or SUVโs capabilities. Whether you can’t shift into 4-High for a snowy road, or you’re stuck in a mode you don’t need, a faulty Transfer Case Control Module (TCCM) can sideline your vehicleโs most important feature. You lose confidence, capability, and control. This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s utility and safety. This is the simple, reliable solution to get your truck back to 100%.
Common Symptoms & Your Direct-Fit Solution
A failing TCCM is the electronic brain of your four-wheel-drive system, and when it goes, it can cause a host of confusing issues. If you’re experiencing any of the following, it’s a strong sign your module needs replacement:
- The “Service 4WD” light is constantly on.
- Your 4WD selector switch lights don’t illuminate or flash without engaging.
- Inability to switch between 2WD, 4HI, 4LO, or Auto modes.
- Unusual grinding or clunking noises during attempted shifts of the transfer case.
- Diagnostic Trouble Codes (DTCs) such as C0306, C0327, C0398, or others related to the transfer case encoder or control circuit.
This programmed 24239190 transfer case control module is the definitive fix. We take all the guesswork and hassle out of the repair. Before we ship it, we flash the unit with the latest official GM software, specifically calibrated to your vehicle using the VIN you provide. This means it arrives at your door ready for a straightforward, plug-and-play installation, saving you an expensive trip to the dealership for programming.
Features & Benefits
- โ VIN-Programmed for You: Arrives ready to install with no additional programming needed. Just plug it in and restore your 4WD system’s function immediately.
- โ Latest GM Software: We flash each module with the most current updates from General Motors, ensuring optimal performance and resolving known factory issues.
- โ Broad Compatibility: Replaces a wide range of original part numbers, including 24261367, 12588096, 24240487, and more, guaranteeing a perfect match.
- โ Restores Full Functionality: Eliminates dash warning lights and restores crisp, reliable shifting between all 4WD modes.
- โ Cost-Effective Repair: Avoid the high costs and scheduling headaches of dealership programming and service fees.
- โ Peace of Mind Guarantee: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Programming
As a technician, I’ve seen countless people try to save a few dollars by buying a used module from a salvage yard or a generic one online. Here’s the problem: a TCCM is not a simple part. It’s a computer that must be perfectly matched to your truck’s specific optionsโits engine, transmission, and even tire size. Installing an unprogrammed module is like putting the wrong key in a lock; it simply won’t work. You’ll still have the warning lights and no 4WD. Our pre-programming service is the most critical step. We ensure the electronic “handshake” between the module and your vehicle is perfect from the moment you install it.
Don’t settle for a truck that’s only working at half its potential. By installing our fully prepared and programmed 24239190 transfer case control module, you are not just replacing a part; you are restoring the core capability and dependability you expect from your GM vehicle. Get ready to tackle any road, in any weather, with complete confidence once again.
Frequently Asked Questions
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) allows us to access the specific factory build data for your truck or SUV. We use this to load the exact GM software and calibrations your vehicle requires for the TCCM to function correctly. This step is essential for a true plug-and-play installation.
Is this a difficult part to install?
For someone with basic mechanical skills, this is a very manageable job. The TCCM is typically located under the driver’s side of the dashboard. It involves removing a few trim panels and disconnecting the electrical connectors. Since our module is pre-programmed, no special tools or software are needed for the installation process itself.
Will this fix the “Service 4WD” light on my dash?
In the vast majority of cases where the TCCM is the diagnosed point of failure, yes. This module is the central computer for the 4WD system, and its failure is the most common cause of the “Service 4WD” warning light and related shifting issues.
How do I know if my TCCM is the problem?
Common symptoms include the inability to shift 4WD modes, a flashing selector light, and a persistent “Service 4WD” message. For a definitive diagnosis, scanning the vehicle for trouble codes is recommended. Codes like C0327 (Encoder Circuit) or C0398 (Mode Select Switch Circuit) often point directly to a faulty TCCM.
What happens if I install a module without programming?
An unprogrammed module, or one from a different vehicle, will not communicate correctly with your truck’s other computers. The 4WD system will not work, the warning lights will remain on, and you will have wasted your time and money. Our pre-programming service eliminates this problem entirely.
Is this compatible with the Denali trim?
Yes, this programmed 24239190 transfer case control module is compatible with Denali models of the Yukon, Yukon XL, and Sierra within the specified year ranges, as well as other trims listed in the fitment guide. We use your VIN to ensure it is programmed correctly for your specific trim and options.