I have searched the forum, watched various YouTube videos and I cant seem to find anything replicating my issue. I am getting code P0503 for the VSS, but not the random speed display on the dash , the "battery not charging" displays at start up (goes away driving) and the air bag light has stayed on once at idle then went off. I attempted to charge the battery myself (it was already fully charged), ordered a new oem VSS, and debating a voltage regulator (headlights pulsate faintly at idle) I don't want to start chasing electrical ghosts if someone has a better idea. car is a 99 Deville base w/118k mi. that was sitting for 6mos, previous owner couldn't get it to pass smog. she was 95yo and running regular unleaded... I got a good puff or two of carbon out the tailpipes when I pushed it hard uphill, floored, with super unleaded. any thoughts??
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