My 4wd switch just flashes ...will not engage 4wd. Could it just be the cold. on 2001 Chevrolet Tahoe

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
works in 2wd fine...if I press auto or 4 wheel hi the light just flashes
(2) Answers
| |
scan codes and post so we can adv
| |
System stores codes so diagnosis is not very tough....Encoder motor failures are not uncommom.
Qualified Local Chevrolet Shops
Qualified Chevrolet Shops For This Repair