Restore Your Truck’s 4×4 Functionality Instantly
Is that frustrating “Service 4WD” light glaring at you from the dash of your Sierra 3500? Are you unable to switch between 2WD and 4WD, leaving you stranded in the wrong mode when you need traction most? As a technician with over two decades of experience, I’ve seen this exact issue hundreds of times. The Transfer Case Control Module (TCCM) is the electronic brain of your four-wheel-drive system, and when it fails, it can cause a host of problems. This isn’t just an inconvenience; it’s a reliability issue that can compromise your truck’s capability when hauling heavy loads or navigating tough terrain.
We offer a simple, reliable solution. This is a direct-replacement TCCM, part number 24239190, for your GM truck. The best part? We handle the most difficult step for you. Simply provide us with your vehicle’s VIN at checkout, and our technicians will program the module with the latest, most stable software directly from GM. It arrives at your door ready to install, saving you a costly trip to the dealership and their programming fees. This is the definitive fix for a faulty 2007-2014 Sierra 3500 TCCM and related models.
Common Signs of a Failing TCCM
- ✔ “Service 4WD” or “Service Four Wheel Drive” message on the instrument cluster.
- ✔ Inability to shift the transfer case into or out of 4-High, 4-Low, or 2-Wheel Drive.
- ✔ The 4WD selector switch lights blink or do not illuminate correctly.
- ✔ Audible clicking or grinding from under the vehicle when trying to engage 4WD.
- ✔ Diagnostic Trouble Codes (DTCs) stored in the system, such as C0327, C0398, or U0100 (Loss of Communication with ECM/PCM).
A Technician’s Notebook: The Misleading Grinding Noise
A customer brought in his ’11 Silverado 2500, convinced his transfer case was shot. He described a horrible grinding noise whenever he tried to switch to 4HI. His local shop quoted him thousands for a new transfer case. I scanned the truck and found a C0327 code for the encoder motor circuit. Instead of jumping to the mechanical parts, I checked the TCCM data. The module was commanding a shift, but it wasn’t receiving the correct position feedback. On a hunch, I swapped in a known-good TCCM. The grinding vanished, and the truck shifted perfectly. The original module was sending erratic signals, causing the encoder motor to hunt for position and create the noise. It was a $300 module fix, not a $3,000 mechanical rebuild. This is why a correctly programmed module is critical for proper diagnosis and repair.
Your Straightforward Installation Guide
Installing your pre-programmed 2007-2014 Sierra 3500 TCCM is a job most DIYers can handle in under 30 minutes with basic tools. It’s located under the driver’s side of the dashboard, near the parking brake pedal.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the Module: Find the TCCM mounted to a bracket under the dashboard, to the left of the steering column. It’s a small black or silver box with several electrical connectors.
- Remove Connectors: Carefully press the release tabs on each wiring harness connector and pull them straight out from the module. Don’t force them.
- Unbolt the Old Module: Use a socket wrench (typically 7mm or 10mm) to remove the bolts or nuts holding the TCCM to its mounting bracket.
- Install the New Module: Mount your new, pre-programmed TCCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Plug the wiring harnesses back into the new module. They are keyed and will only fit in their correct slots. Reconnect the negative battery terminal.
- Final Check: Start the truck and test the 4WD selector switch to confirm all modes engage correctly. The “Service 4WD” light should be off.
Guaranteed Fitment for Your GM Truck or SUV
This module is a direct replacement for multiple part numbers and fits a wide range of General Motors vehicles. Please verify your model and year below. This part is compatible with the following part numbers: 24261367, 12588096, 24239190, 24240487, 24241143, 24241970, 24242480, 24243084, 24243085, 24249095, and 24252878.
- AVALANCHE 1500: 2008-2013
- SIERRA/SILVERADO 1500: 2007 (New Body Style, opt NQH), 2008-2013
- SIERRA/SILVERADO 2500 HD: 2007 (New Body Style, opt NQF), 2008-2014
- SIERRA/SILVERADO 3500 HD: 2007 (New Body Style), 2008-2014
- SIERRA DENALI: 2007-2010
- SIERRA DENALI 2500/3500: 2011-2014
- SUBURBAN 1500: 2008-2014
- SUBURBAN 2500: 2008-2013
- TAHOE: 2008-2014
- YUKON / YUKON XL 1500: 2007 (Denali), 2008-2014
- YUKON XL 2500: 2008-2013
Frequently Asked Questions about the 2007-2014 Sierra 3500 TCCM
Do I really need to provide my VIN?
Yes, this is essential. We program the module with GM’s latest software specific to your truck’s VIN. This ensures perfect compatibility with your vehicle’s options (like transfer case type and axle ratios) and prevents communication errors.
Will this fix my ‘Service 4WD’ light?
In the vast majority of cases, a faulty TCCM is the root cause of the ‘Service 4WD’ light on these GM trucks. While other parts like the encoder motor or selector switch can fail, the module is the most common point of failure.
Is any additional programming needed after installation?
No. Because we program it to your VIN before shipping, it is a true plug-and-play part. You will not need a scan tool or a trip to the dealer for any additional setup.
Where is the TCCM located on my truck?
The Transfer Case Control Module is typically located under the driver’s side dashboard, to the left of the steering column and often near the emergency brake assembly.
Is this part difficult to replace myself?
Not at all. With basic hand tools like a socket wrench, most people can replace this module in under 30 minutes. The most important part is being able to comfortably access the area under your dashboard.