Regain Control of Your 4WD System with a Plug-and-Play Solution
Is the dreaded “Service 4WD” light glaring at you from the dash of your Sierra Denali? Are you unable to shift into 4-High for a slippery road or 4-Low for a tough job? You’re not alone. As a technician with over two decades of experience, I’ve seen this exact issue countless times. The Transfer Case Control Module (TCCM) is the electronic brain of your truck’s four-wheel-drive system, and when it fails, it can leave your capable HD truck feeling powerless. This isn’t just an inconvenience; it’s a matter of capability and safety.
Forget the expensive trip to the dealership and the long wait for programming. We offer a direct, reliable fix. This is a genuine GM Transfer Case Control Module, part number 24243084, that we program specifically to your truck’s Vehicle Identification Number (VIN) before it ships. It arrives at your door with the latest GM software updates already installed, ready for a straightforward installation. This process ensures perfect communication between the module and your truck’s other systems, eliminating the common errors that come with unprogrammed parts.
Is Your Truck Showing These Symptoms?
A faulty TCCM can manifest in several ways. If you’re experiencing any of the following, there’s a strong chance this module is the culprit. In my shop, these are the classic indicators I look for:
- âś” “Service 4WD” or “Service Four Wheel Drive” message on the instrument cluster.
- âś” Inability to shift the transfer case between 2WD, 4HI, Auto, or 4LO.
- âś” The 4WD selector switch lights don’t illuminate or flash without engaging.
- âś” The truck is stuck in a single drive mode (e.g., 4HI or 2WD).
- âś” Diagnostic Trouble Codes (DTCs) stored in the system, such as C0327, C0398, or various U-codes (U0100, U0101) indicating a loss of communication.
From the Diagnostic Bay: The Case of the Unresponsive 4×4
A customer brought in his 2012 Sierra 2500, frustrated because his 4WD had quit just before a major snowstorm. He was a contractor who relied on his truck daily. The selector switch was dead, and the “Service 4WD” light was on. His local shop had quoted him over $700 for a new module plus programming. We scanned it and found a classic TCCM communication failure code. Instead of sending him to the dealer, we used one of our pre-programmed modules. The physical swap took less than 30 minutes. The moment we reconnected the battery, the selector lights came on, and the truck shifted perfectly through all ranges. He was back on the road for less than half the dealer’s quote, with his truck’s full capability restored. This is the power of a VIN-programmed, ready-to-install part.
A Straightforward Guide to Installation
One of the biggest benefits of this pre-programmed module is the ease of installation. You don’t need advanced diagnostic tools, just basic hand tools. This makes it a perfect job for a DIY enthusiast or a quick swap for a professional mechanic.
- Safety First: Always disconnect the negative terminal from your truck’s battery before working on any electronic components.
- Locate the TCCM: On most GM trucks of this era, the TCCM is located on the driver’s side of the dashboard, up and 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. Then, unbolt the module from its mounting bracket. It’s typically held in by one or two small bolts or nuts.
- Install the New Module: Bolt the new, pre-programmed TCCM into place. Ensure it is secure.
- Reconnect: Plug the electrical connectors firmly into the new module. You should hear or feel a click as they seat properly.
- Final Steps: Reinstall any dash panels you removed. Reconnect the negative battery terminal. Turn the ignition on (without starting the engine) and test the 4WD selector switch. The lights should illuminate, and you should hear the transfer case motor engage as you cycle through the modes.
Guaranteed Fitment for Your GM Truck or SUV
This module is a direct replacement for a wide range of GM vehicles. Please verify your truck is on this list. This part is compatible with the following part numbers: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, and 24252878.
- Sierra Denali 2500: 2011-2014
- Avalanche 1500: 2008-2013
- Sierra/Silverado 1500: 2007 (New Body Style) – 2013
- Sierra/Silverado 2500 & 3500: 2007 (New Body Style) – 2014
- Sierra Denali & Denali 3500: 2007-2010, 2011-2014
- Suburban 1500 & 2500: 2008-2014
- Tahoe / Yukon / Yukon XL: 2007-2014
Don’t let a faulty module sideline your truck. This pre-programmed 2011-2014 Sierra Denali 2500 TCCM is the most efficient and reliable way to restore your four-wheel-drive system to factory performance. Provide your VIN at checkout and let us handle the complex part, so you can get back to what matters.
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) allows us to program the TCCM with the specific software and calibrations for your truck’s exact configuration (engine, transmission, transfer case model, etc.). This ensures seamless communication and proper 4WD operation without any additional programming.
Is this part difficult to install?
No, the physical installation is very straightforward for both DIYers and professionals. It involves unplugging the old module and plugging in the new one. Since we handle the programming, no special computer tools are needed. Most people can complete the job in under an hour with basic hand tools.
Will this fix my “Service 4WD” light?
In the vast majority of cases, yes. The TCCM is the most common cause for the “Service 4WD” light and the symptoms described. However, we always recommend a proper diagnosis to rule out issues with the transfer case motor or selector switch, though these are less frequent failures.
What if I order the wrong part?
Our extensive fitment list and VIN programming process greatly reduce the chance of an incorrect part. Please double-check your vehicle’s year and model against the compatibility list. If you are unsure, contact us with your VIN before ordering, and we’ll be happy to verify fitment for you.
Is this a new or used part?
This is a high-quality, inspected, and tested genuine GM part that has been professionally programmed with the latest software updates for your vehicle. It is guaranteed to restore your vehicle’s function.