Car messing up a few weeks after giving someone a jump, what could be wrong?

I tried to start my car today and it wouldn’t turn on. Called AAA and they ran a battery and alternator check and both were fine. He said the mess up has to do with the security/alarm system. I don’t have an alarm button on my keys anymore cause it broke. Well it shut down again and won’t start so once again I’m waiting on AAA. How much do you think this will cost me to fix and do you think this is happening because I gave someone a jump about 2-3 weeks ago?

6 Answers

  • zipper
    Lv 6
    2 months ago

    That's a maybe, most likely the security system is getting some kind or reading from your broken alarm key, I would go buy a new one with a working button and take the battery out of the broken one and not use it again.

  • 2 months ago

    A stock alarm system won't effect the starter cranking the motor over. It just disables the fuel injectors.

    If the jumper cables were connected backwards for even a second or two it can take out the drivers in the PCM that control the alternator output.

    Try starting it in neutral. I'd get a 12 volt test light and make sure the ignition switch is sending power to the neutral safety switch when turned to the start position. If it is then see if the neutral safety switch is sending power to the starter solenoid trigger wire.

    Source(s): Mitsubishi Master Tech
    • falconry2
      Lv 7
      2 months agoReport

      It is possible the key fob issue is affecting the start circuit also; when something is broken and makes something else not work, I'd be looking there. The security alarm-broken alarm button could be a direct correlation. If it was the jump, then you'd notice it then not now.

  • 2 months ago

    todays car computers use special Jumper leads or you blow the User and sender computers

    the sender car should be switched off to prevent this

  • Snezzy
    Lv 7
    2 months ago

    The usual thing to do when jumpstarting is to touch the hot cables (the ones from the car that's working) together to make a spark. It's fun, it looks neat, and the fat spark assures you that the battery's just fine.


    Why? The spark generates electromagnetic radiation (radio waves) that might be strong enough to wipe out some of the car's delicate electronics. 

    Did that happen to your car? It might have. Have your expensive mechanic look at it.


    As the Bax 2006 says, if the cables were hitched backwards that'll wipe out various electric parts. Just like my "don't do that" above, people often try one way and then the other way. After seeing the big 24-volt spark they hitch it up the other way. Always best to do the jumper connections yourself, knowing precisely the correct way, and not letting anyone else mess with them.

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  • 2 months ago

    You will probably have to get the car seen by an auto electrician. They're the experts when it comes to dealing with such problems. Your average auto club patrolman/woman is a qualified mechanic but not able to handle complex electrical problems. I had a faulty electronic engine immobilizer and a garage mechanic advised me to get an auto electrician to repair or replace it, which I did. Similarly, for auto air-conditioning re-gassing etc., you're better off taking the vehicle to an auto air-conditioning specialist.

  • 2 months ago

    maybe you should have a mechanic check it out

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