My car wont stay started after i had unplugged and re plugged battery..

Asked by Oct 08, 2015 at 02:17 AM about the 2006 Hyundai Sonata

Question type: Maintenance & Repair

well my oldest unplugged the battery to change a head lite bulb . yes i know ..anyways now after reconnecting. car wont stay started.. dies .

8 Answers

725

Don't understand "Unplugged the battery", do you mean "disconnected"? The battery only starts the car, once started the spark plugs derive spark from the alternator. If the car starts, its a good chance the batter is good and hooked up correctly. However, she may have disconnect another wire that leads from the alternator to the coil pack (which sparks your spark plugs). Look for any more disconnected wires from the alternator to the coil

ok after she reconnected the battery, started the car, it ran for like 1min then died. and while its running.. it very loopy/runs ruff at times

88,785

It sounds like it didn't complete the reset procedure, I would try disconnecting the battery again then turn the headlight switch on, doing this drains the capacitors and clears the ECM memory, the longer you can leave it the better, but it has to be disconnected for at least a minute, turn off headlight switch and reconnect the battery, on some vehicles this will set off the alarm if equipped, so make sure you know how to shut it down before performing this procedure, start engine and drive as you normally do for about 20 minutes, this will relearn the ECM as to vehicle and how it is driven. HTH

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Best Answer

so(1) disconnect battery .(2) turn ON head lights ..wait like what 30mins? then(3)turn OFF head lights (4) reconnect battery (5) restart car . and run 20mina or so..... i dont know if she touched the bulb but i think she did.. and if it doesnt bulb lite doesnt work but car DOES.. ill repeat this from steps after i replace headlamp bulb ..pray she didnt touch it ggrr . ill get back to u..thanks

88,785

Oh man touched the bulb, and disconnected the battery, are you two going to have a talk about reading instructions? Good Luck

ok car still doing the same i guess next is map censer what i call it... off there air filter,, its a used part bout 4mths old.. acts same.. just funny it just did this at bulb changing time..

88,785

Yeah used emission parts if they are good they don't last long, is the check engine light on also?

725

Your ECM might be completely bad. If all you did was disconnect the ground and replace a headlight. It should have booted right back up with this stock programming in tact. If it only stays on for a minute you might have a fuel pump relay issue. There could be a short and the fuel pump relay is overloaded and then turns off. If you are giving it gas, does it die?

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