Hi I have a 2003 ford f150 supercrew and I have never had a problem with it but yeasterday the 4x4 light and low range light came on and the 4 wheel drive switch is on 2 wheel and when I try to switch it over it does not work, also when I drive it the it takes longer to go faster and it keeps jumping, I have tried to unplug the power to reset the computer but that had not worked thanks.

 

i had a simular problem with my old 97 f150 (RIP) it had water in the transfer case and was shorting the sensor so the GEM board was mess'n up

change of fluid took care of it