Q: gear selection indicator is lit but the indicator only displays when you are in r on 2002 Chevrolet Silverado 2500 HD

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problem started this morning and when you put it in park the doors do not unlock automaticly but the truck will start in park even though the indicator does not show that you are in park
(1) Answer
That would be your "neutral safety switch" located on the transmission.

I have done 3 of these on three trucks. Water gets in them, was a bad design on GM's side of things

100 bucks if you do it yourself, or 200-300 at the stealership