Restore Your 4WD and Take Command of the Road
Is your truck’s ‘Service 4WD’ light glaring at you from the dash? Are you stuck in two-wheel drive, unable to shift your transfer case when you need it most? Don’t let a faulty Transfer Case Control Module (TCCM) sideline your hardworking vehicle. This pre-programmed TCCM is the definitive, dealership-free solution to restore your GM truck or SUV’s four-wheel-drive capability and put you back in control, whether you’re on a muddy job site or a snowy highway.
Common Symptoms & Your Direct-Fit Solution
A failing TCCM can cause a host of frustrating issues. If you’re experiencing any of the following, this module is the solution you need:
- “Service 4WD” Message: The most common indicator of a TCCM problem.
- Inability to Shift: The system will not switch between 2WD, 4HI, and 4LO.
- Incorrect Indicator Lights: The selector switch lights don’t match the actual drive mode.
- Diagnostic Trouble Codes (DTCs): Often triggers codes such as C0306, C0327, C0374, or C0398.
This module directly addresses these communication and command failures. We eliminate the guesswork and the need for expensive dealership tools by flashing this unit with the latest GM software updates, tailored specifically to your vehicle’s VIN. This is the most reliable way to perform this repair, and it’s why our Programmed Transfer Case Control Module 24252878 is the trusted choice for mechanics and DIYers alike.
Features & Tangible Benefits
- ✔ VIN-Programmed for You: This module arrives at your door ready for installation. No extra trip to the dealer for programming is required, saving you significant time, money, and hassle.
- ✔ Updated GM Software: We flash each unit with the newest, most stable software available from GM. This often corrects factory flaws and improves transfer case performance and electronic reliability.
- ✔ Restores Full 4WD Function: Regain complete and immediate control over your 2WD, 4HI, and 4LO settings. Get the traction you need, exactly when you need it.
- ✔ Broad Compatibility: This single unit replaces a wide range of original part numbers, including 24261367, 12588096, 24239190, 24240487, and more, ensuring a perfect electronic and physical match for your vehicle.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty, giving you complete confidence in your purchase and the repair.
An Expert’s Insight on TCCM Failure
From my 20 years on the shop floor, I’ve seen countless GMT900 trucks come in with 4WD issues. Often, the root cause isn’t a major mechanical failure in the transfer case itself, but a communication breakdown in the original TCCM. The location under the dash makes them susceptible to moisture from windshield leaks, and voltage spikes can corrupt the software. Our process isn’t just about loading data; it’s about providing a stable, updated module that solves the problem at its source. For any DIYer or independent shop, choosing a pre-programmed unit like this Programmed Transfer Case Control Module 24252878 is the single best way to perform this repair correctly the first time, avoiding the frustration of a part that won’t communicate with the rest of the truck.
Frequently Asked Questions
How does the programming process work?
It’s simple. After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. Our technicians use this VIN to download the exact, most current GM software for your truck’s specific configuration. We then flash the module before shipping it to you.
Is this a true plug-and-play installation?
Yes. Because we handle all the programming on our end, the module you receive is ready to be installed. Simply disconnect the battery, swap the old module with the new one, reconnect the battery, and your 4WD system will be restored. No additional tools or dealer visits are necessary.
What happens if I forget to provide my VIN?
We cannot ship your order without a VIN. The module is essentially a blank computer and will not function in any vehicle until it is programmed. We will contact you to request the VIN, but this will delay your shipment.
Will this definitely fix my “Service 4WD” light?
A faulty TCCM is the most common cause for the “Service 4WD” light and related symptoms on these GM vehicles. While this module is the correct fix in the vast majority of cases, we always recommend proper vehicle diagnosis to rule out other potential issues, such as the encoder motor or selector switch.
Which part numbers does this module replace?
This module is a direct replacement for a wide range of part numbers, including 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, and 24252878. Please check the fitment list to confirm it matches your vehicle.