I had this problem about a week and a half ago. It was frustrating. My car was running 4x4 all the time therefore the fuel comsumption was greater. Also my reversesensor went off. It was not working at all. I bumped into many small cars. The radiowould not turn off after 6 minutes once the engine was off. The memory seats option was useless, the heated seats were disabled. My auto lights were not working. My alarm was not working well.

I took the car to several places in order to avoid going to the dealer. They put the car through a machine and they found that a module was not working. That little thing under the car control almost every electrical function in our trucks. Be aware, this part cost $378 and of course that is the dealer price. After the problem was fixed I put rims on my truck and we are happy again.