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
1 answer
that code is not listed in all data,ck circuit 1st then its poss the switch iv seen this alot on gmc