The service 4WD light usually only comes on when it’s cold outside or snowing, something’s the 4WD works fine some days the light comes on and I can’t use it. Any help I could use to help solve this problem, I’ve got the switch module and encoder motor replaced already also what else could it be. I was told the transfer case isn’t in bad shape.

 

Please post your vehicle details (should have been in the right section too). Have you run a diagnostic scan yet?