Question about 2003 Jeep Grand Cherokee

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Battery disconnected turned on "check engine" light

How can one reset the check engine light caused by the disconnection of the battery?

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Light should go out by itself once the system runs through a few cycles.

Posted on Feb 04, 2010


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Posted on Jan 02, 2017


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Just because the lights go on does not always mean that the battery has enough power to engage the starter. The clicking noise could be the voltage regulator clicking. And since you disconnected the battery maybe there is not a great connection at the terminals. Were the terminals cleaned before the battery was reconnected?
Curious ... what was the cause of the check engine light going on?

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As I know disconnecting battery cable cannot reset engine light.
Engine light on caused by a fault code remained in the OBD system. You have to clear the fault code to reset engine light.
But before that, I suppose to have your car checked first to make sure there's nothing wrong.

Good luck.

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- not all cars will clear the code after disconnecting the battery
- some problems, if not repaired in time may cause a serious damage and more costly repair.
- the radio, if code-protected, may be locked after disconnecting the battery
- the "check engine" light will come back anyway if the problem still exists.

But by all means try disconnecting the battery (for at least 1 minute) first.



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How can i reset my check engine light?

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2002 kia optima wont pass emissions. check engine light was on, then turned off. how to reset computer

Reseting the cpu will clear the check engine code however it will not fix the problem that caused the check engine light to come on. The most common cause of failing emissions is the O2 Sensor. This sensor will trigger the check engine light when it is failing. The good news is that the Oxygen senser is pretty cheap and is mounted on your exhuast so it is fairly easy to replace yourself. I suggest replacing your O2 sensor the clear the computer by disconnecting the negative battery terminal and leave it disconnected for a few moments, hook up the negative again and it's all clear. Take your car back threw emmisions and you should be all set.

Hope this helps

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