The VDC system also incorporates an all-wheel, allspeed Traction Control System (TCS) to help reduce wheel spin. The combination of these two technologies helps provide outstanding handling and control in a wide variety of driving conditions. Controlled by VDC, the VTD center differential – not the traction control system – governs power distribution. The system operates while driving in a straight line or cornering and can help maintain traction even if up to three wheels are slipping. If the driver is applying more throttle than available traction
will allow, VDC will reduce engine power. It is important to point out that the VDC system uses traction control as a second line of defense, activated only when VTD alone cannot maintain sufficient traction.
VDC models include a “VDC OFF” switch to turn off the stability and traction control for driving in or extricating the vehicle from deep snow or mud. Under such conditions, the selective braking action that a stability control system provides is not desirable. It is important to point out, however, that even with VDC off, the VTD All-Wheel Drive system remains 100% operational at all times. If VDC is switched off, it will default to "ON” the next time the vehicle is started and driven over 32 mph.