Bought the truck a week a week ago, all worked fine in all modes(2h 4a 4h 4L- just a foward and backward in a dry parking lot for 4L) at the time. 108k miles. Have driven the vehicle on the road in all modes other than 4low since purchace. Had an ice storm and very slippery uphill drive way yesterday so i decided this was a better place to test the 4 low. Each time i tried to use 4 low the wrench and message showed up. Ive read several other posts and made sure i was in neutral and tried with foot on the brake and off. Also tried backing up a bit then trying again as well as rolling forward a bit and trying again. No luck. I did not see any posts on any fixs.