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

works in 2wd fine...if I press auto or 4 wheel hi the light just flashes

by in Appleton, WI on January 24, 2013
2 answers
ANSWER by on January 24, 2013
scan codes and post so we can adv
ANSWER by on January 24, 2013
System stores codes so diagnosis is not very tough....Encoder motor failures are not uncommom.