Dodge Durango service 4WD light on with knob not engaging into 4WD on Dodge Durango

Some Dodge Durango owners report experiencing issues with the "Service 4WD" light illuminating and the 4WD knob failing to engage. These problems can stem from mud, dirt, or oil buildup under the vehicle that interferes with the 4WD moving parts. Additionally, owners may find that the transfer case must be in the neutral position before shifting from 2WD to 4WD, and attempting to shift back and forth between reverse and drive may help engage the system. Some also note the importance of inspecting the fuse and oil level in the transfer case, as well as potential malfunctions with the transfer case shift motor or switch. If these troubleshooting steps do not resolve the issue, consulting a mechanic or dealership for further diagnosis and repair is advised.