My GMC truck , is got a P1875 code, which is the 4WD low switch, on 1997 GMC 1500 Pickup

the truck will not shift out of first gear, however when I engage the 4WD low it works, and 4wd high also works, what can be wrong with this truck, help...

Asked by for the 1997 GMC 1500 Pickup
that code is not listed in all data,ck circuit 1st then its poss the switch iv seen this alot on gmc