Is a “Service 4WD” Light Ruining Your Drive?
There’s nothing more frustrating than looking down at your dash and seeing the dreaded “Service 4WD” message, especially when you rely on your truck’s capability. When your Sierra, Silverado, Tahoe, or Yukon suddenly refuses to shift into 4-Hi or 4-Lo, it’s not just an inconvenienceโit’s a loss of the core utility you depend on. The problem often lies with a failed Transfer Case Control Module (TCCM). This isn’t just a part; it’s the brain of your 4×4 system, and we have the definitive, hassle-free solution to get you back in control.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a failing TCCM is the most likely culprit:
- The “Service 4WD” light is illuminated on your dashboard.
- Your 4WD selector switch is unresponsive or its lights are flashing.
- The vehicle is stuck in 2WD and will not engage 4WD (or vice-versa).
- You’re seeing Diagnostic Trouble Codes (DTCs) like C0306, C0327, C0374, or U-codes related to lost communication.
Our Programmed 24252878 Transfer Case Control Module is the answer. We take the guesswork and dealer expense out of the equation. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the module with the latest, most stable software updates directly from GM. It arrives at your door ready for a true plug-and-play installation, restoring your truck’s off-road and all-weather confidence.
Features & Benefits
- โ VIN-Programmed for Your Truck: This module arrives ready for installation with no need for an expensive trip to the dealership for programming. Just plug it in and go.
- โ Loaded with Latest GM Updates: We flash each unit with the newest software to correct factory bugs and improve transfer case performance and reliability.
- โ Restores Full 4×4 Functionality: Regain complete control of your 2WD, 4-Hi, and 4-Lo settings for any road or job site condition.
- โ Direct-Fit Replacement: Engineered to be a perfect match for a wide range of GM trucks and SUVs, ensuring a seamless installation. Compatible with part numbers 24261367, 12588096, 24239190, and more.
- โ This unit is backed by our one-year replacement warranty.: Your purchase is protected, giving you complete peace of mind.
An Expert’s Insight on TCCM Failure
As a technician with over 20 years on the floor, I’ve seen dozens of these GMT900-platform trucks come in with 4WD issues. The TCCM is located under the dash, but it’s still susceptible to failure from voltage spikes or internal component degradation over time. Many owners try to save a few bucks with a junkyard part, only to find it’s either faulty or, worse, still needs to be programmed by the dealer, erasing any initial savings. Getting a quality, tested Programmed 24252878 Transfer Case Control Module that’s flashed to your specific VIN is the single smartest way to do this job right the first time.
Frequently Asked Questions
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is specific to your vehicle.
Will this fix my “Service 4WD” light?
In the vast majority of cases where symptoms point to the TCCM, this part is the correct fix. Once installed, the light should go off, and 4WD functions will be restored. If the problem persists, you may have an issue with another component, such as the transfer case encoder motor or the dash switch.
Is this a brand new part?
This is a professionally inspected and verified component that is guaranteed to perform to OEM standards. Each module is tested before being programmed with the latest GM software for your vehicle.
Do I need special tools for installation?
No special tools are required. The TCCM is typically located under the driver’s side of the dashboard and is accessible with basic hand tools like a socket set. The installation involves disconnecting the battery, removing a few trim panels, and swapping the electrical connectors.
Which transfer case options does this fit?
This module is compatible with vehicles equipped with transfer case RPO codes NQH (2-speed, electronic, Autotrac) and NQF (2-speed, electronic shift), which cover the most common configurations for the listed GM trucks and SUVs.