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Hello,

I have a 2004 Elantra that has recently been giving us some trouble. It went into "limp-home" mode at which time my friend reset the car to get it running which I assume erased the codes because when I had the codes checked, nothing came up. I waited for about a month with no troubles and then it started having the same problems with kicking into the safe mode. I took it straight down to the auto parts store and NO codes came up. At first I believed it to be the input or output speed sensor but now that I have no codes to tell me for sure I am stumped. I obviously don't want to buy new sensors ($$) and have it be a completely different issue. Here is what is happening...

Car tries to shift into higher gear and there is a big "clunk" then it goes into safe mode and the dash lights all flash or tick. The radio loses all power as well. I can drive it home but as soon as I let it idle it will die. If I happen to get it home and turn the engine off then it won't restart without jumping the battery.

Without codes am I going to be able to pinpoint the issue? Should I take it to someone with a better code reader, or is that not the issue?



Thanks for your help!
 

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QUOTE (jsinton @ Jun 28 2010, 02:39 PM) index.php?act=findpost&pid=336849
So when it the last time you had the trans fluid changed?
We had the trans fluid changed about 7K miles ago. We have maintenance done on it pretty religiously (with fluids checked and changed when dirty).

I am also wondering if the alternator could be causing a problem since the battery is losing power every time we turn it off (and the battery is brand new).
 

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Definitely, I would fix the charging problem before I assumed anything. It could certainly be a voltage problem. Take it someplace like Walmart for a free charging system check.
 

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Took it to O'Reilly's and they said that the alternator was holding a charge of 14.3 volts and after doing the "at home" checks of turning on the high-beams and removing the negative cable on the battery, the car still runs fine.

I figure that I can't get the codes because the car battery is dying before I get to the auto parts store thereby erasing everything. I get the car running and then as soon as it goes into safe mode the entire dash lights up and the car radio turns off.

Will the safe mode cause my car to lose power? I obviously don't want to change the alternator is it's something completely different.
 

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It's really bad for your car to have to jump start the battery everytime. You need to fix that asap. You could have the problem with the battery cables:
 
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