"Service Power Steering" message but no problem. Dealer checks OBDC codes - maybe caused by a low voltage condition. Confirmed as car wouldn't start 1 day, battery dead. Was starting fine, no warnings. Fortunately car can be jump started from hybrid battery without cables using controls on dash. Cost was to diagnose codes and replace battery.
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frequently 2013 Buick LaCrosse problems occur, check out our car reliability stats.