P0025 KIA -

Question

Dear Sirs: Referred to my Kia Mohave, every time I select
4x4 Low Gear (Selector switch in 4L) the engine warning lights
on. (Code P0025, cam shaft sensor, etc.etc.) Engine runs perfectly
and every seems to be normal. The failure light goes off reseting
the battery negative terminal and remains off until the next time
I select 4L. I´ll appreciate any concerning comment.
Thankyou.