2002 chevy Tahoe c0308 c0327 no lights on 4wd switch

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Ialsofkdyourdad

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Hey I posted before but I was able to scan it and it was a bit weird


At first it only had c0308 which is a voltage issue, I saw online people had fixed it by cleaning ground points and the connector. so I went under the truck and cleaned the connector and unbolted the ground points, hit then with a flap wheel and grinder reattached them and painted the showing bare metal



I went up and the truck still had the service 4wd system and no lights I rescanned the truck and it now has c0308 and c0327. Before I order the encoder motor is that for sure what these codes mean or is there anything else I should check?




Also is there any way to know if the encoder is splined or keyed without taking it off? If not I'll order both and return the one I don't use
 

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