My son has the permanent lite on in the dash for 4 wheel drive when its not on. How do I get it off?

I drive a jeep liberty, and noticed my part time 4 wheel drive lite is on in the dash when the 4 wheel drive is not engaged. When I un engage the part time 4 wheel drive, the lite comes on saying its in part time 4 wheel drive. In order to get it off, I have to pull up the shifter to get into 4 wheel drive. In other words, the dash says the 4 wheel drive is on when its actually off and the dash lite goes out when the 4 wheel drive is engaged. Do I have to take my jeep to the dealer to get that darned lite to work right. Also, now my engine lite is on almost constantly, I thought it would go off when I got gas and screwed the gas cap on tight, but its not working. Heck, my whole dashboard is lit up. What to do?|||The front axle is probably engaged. Try taking it to an empty parking lot and backing up for about 100 feet. That will often correct the problem. If that doesn't do it it is probably the module that controls it. They are not too expensive, maybe $100-$200.