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I have had the abs light and brake light on since I bought the truck. it's 4x2 abs I changed the rear speed sensor just to try. I brought it to the dealer to get scanned and it came back with code 65 he said it was main open maybe. Said something about a rwal valve,did say that the abs computer was good.but wanted and little input from you guys

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It means the ABS module isn't powering up.  Check the fuses and ground for the module and ohm test the rwal solenoids under the module.  If they are O'K then the module's internal relay is bad and the module needs to be replaced or repaired (see above).

The dealer should have run a full diagnostic on the ABS system and given a written report. 

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Main relay is in the ABS control module. Without any other diagnostics to go by, the module needs repair/rebuild.

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