what do i try to fix when truck wont get out of 4wd on 2003 Chevrolet Silverado 2500 HD

truck will not come out of 4wd

3 answers
You know there was a recall on this mine slammed into 4 wheel drive all by its self and when i took it to the dealer they told me there was a recall and they fixed it
start with scanning codes and posting so we can adv
possible actuator not retracting...