Is a “Service 4WD” Light Ruining Your Drive?
When you depend on your GM truck or SUV, the last thing you want to see is a warning light that compromises its core capability. A faulty Transfer Case Control Module (TCCM) can leave you without four-wheel drive when you need it most—whether you’re navigating a treacherous job site, a snowy mountain pass, or a muddy trail. Don’t let a failed electronic module sideline your powerful vehicle. This is the simple, reliable solution to restore your truck’s legendary go-anywhere performance.
Common Symptoms & Your Direct-Fit Solution
If you’re experiencing any of the following issues, a failing TCCM is the most likely culprit:
- Persistent “Service 4WD” or “Service Four Wheel Drive” message on your dash
- Inability to switch between 2WD, 4-Hi, and 4-Lo
- Indicator lights on the 4WD switch are blinking or not illuminating at all
- Unusual grinding or clunking noises when attempting to engage 4WD
- Diagnostic Trouble Codes (DTCs) such as C0327, C0306, or C0398
This is your definitive fix. We are providing a high-quality, programmed GM transfer case control module that is flashed with the latest official GM software specifically for your vehicle’s VIN. This critical programming step means you can skip the expensive and time-consuming trip to the dealership. It’s designed to be a true plug-and-play repair that gets you back on the road with confidence.
Features & Benefits
- âś” VIN-Programmed for Your Truck: This module arrives at your door ready for installation. We program it using your VIN to ensure it communicates perfectly with your truck’s systems, just like an OEM part from the factory.
- âś” Restores Full 4WD Functionality: Regain complete control over your transfer case. Switch modes smoothly and reliably, and extinguish that frustrating dash light for good.
- âś” Direct-Fit OEM Compatibility: Engineered to be a perfect replacement for a wide range of original part numbers, including 12588096, 24261367, 24239190, and more, guaranteeing a flawless installation.
- âś” Avoid Expensive Dealer Fees: The most significant benefit of our programmed GM transfer case control module is avoiding the hefty programming fees and labor charges at a dealership. This is a smart, cost-effective repair.
- âś” This unit is backed by our one-year replacement warranty. We stand behind our parts, giving you peace of mind with your purchase.
From the Technician’s Bench: A common failure point in these original TCCMs is internal circuit board corrosion or solder joint failure from years of vibration and thermal cycles. The updated GM software we install helps optimize the module’s operation, reducing electrical stress and improving long-term reliability. By installing this module, you’re not just replacing a part; you’re getting a component with improved logic to prevent future issues. It’s the fix we perform in our own shops.
Frequently Asked Questions
Do I need to take this part to a dealer to be programmed?
Absolutely not. That’s the primary benefit of our service. We pre-program the module to your vehicle’s specific VIN before we ship it. This makes the installation a simple plug-and-play process, saving you hundreds in dealer fees and a day of your time.
How do I provide my VIN number?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive and validate your VIN, so please provide it promptly to avoid delays.
Is this a difficult part to install?
For most of the listed GM trucks and SUVs, the TCCM is located under the driver’s side of the dashboard, to the left of the steering column. It’s typically held in with a few small bolts or clips and has a few electrical connectors. Most DIY mechanics with basic tools can complete the replacement in under an hour.
What if my original part number isn’t on your compatible list?
The part numbers listed are the most common, but GM often has many superseded numbers. If you don’t see your exact part number, please contact us with your VIN. We can verify compatibility to ensure you receive the correct programmed GM transfer case control module for your truck.
Will this module fix my specific 4WD problem?
This module corrects issues directly related to TCCM failure, such as the common “Service 4WD” light and inability to shift. While it is the most frequent point of failure, other components like the transfer case encoder motor or the dash switch can also cause issues. We recommend confirming your diagnosis or consulting with a technician if you are unsure.