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Do a reset. Turn the key on for ten minutes, off for thirty seconds, then start. A relearn is three times this, start after the third time. Use a battery charger on the relearn. Each time you try to start it, you have to start over.
Sound like the solenoid on the starter is going bad. Take the starter to a parts store and have them test the starter. If the starter checks out good on the first test, tell them to test it ten more times as your problem is intermittent.
Grab a test light go down to the starter, hook to a good ground and probe the battery cable. If that has power probe the solenoid engage wire( its the little one) have a helper turn the key to start if that gets power replace the starter.
OKAY MAKE SURE ALL ACCESORIES ARE OFF .TURN KEY TO ON POSITION "DO NOT TRY TO START " LEAVE IT ON FOR TEN MINUTES AFTER THE TEN MINUTES TURN KEY TO OFF POSITION FOR 30 SECONDS .THEN TURN KEY AND TRY TO START .IF NOTHING REPEAT UP TO THREE TIMES
Your keys need to be reprogramed, especially if you have disconnected the battery. To do this operation you will need 30 minutes of your valuable time or take it to the dealer & pay through the nose. Turn your key to on position but do not start. Leave key on for ten minutes & then shut off & on. Again do not start & leave key on for ten minutes. Do this a third time the same way. Turn off after the 3rd 10 mins. & start car. The key will be reprogramed to the power control module. Do this procedure with any spare keys. Good luck!
take it back to the dealer that they better get it right or your contacting Hyundai of North America and complaining about their incompetence. if you bought this car new is still under warrantee that is .. this is going to be the only real way of solving this type of problem since we are talking about the factory security system which all those factors you mentioned are all linked together. That car should still be under warrantee.. you know if they reprogrammed the same key you had (because all car makes of these kind of keys are know to lose their "programing") that key may be faulty. 10 years/ 100,000 miles
TRY THE RELEARN PROCEDURE.....INSERT KEY IN IGNITION, AND TURN TO THE RUN POSITION,,DO NOT CRANK THE ENGINE..LET CAR SET WITH KEY ON FOR TEN MINUTES.. THEN TURN KEY OFF AND THEN BACK ON FOR ANOTHER TEN MINUTES... AGAIN TURN OFF THEN BACK ON FOR THE LAST TEN MINUTES... AFTER TIME IS UP TURN OFF REMOVE KEY AND REINSERT AND ATTEMPT TO START CAR.. IF STILL NO GOOD TRY A SPARE KEY IF YOU HAVE ONE IF STILL NO GOOD TAKE YOUR KEY TO DEALER FOR REPRORAMMING