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Charging my 2004 impala is charging at 18 volts. The security light comes on sometimes but nothing else seems to be wrong.What can cause overcharging besides bad reglator in alternator?

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Sounds like the regulator is full fielded you need to change the alternator

Posted on Sep 22, 2008

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My 2004 impala dashboard lights come on while driving it doesn't cut of but after I cut the car off headlights flash an clickin noise start what wrong with my car please help Loretta


Impala's are famous for ignition issues, are the interior lights of your dash coming on when you want them, or just by themselves? The clicking after you turn off, I would check the security system, i.e., remote clickers, cars computer, key chip, ect. Sound like your alarm is attempting to engage

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2004 Chevy impala won't start sometimes


Is the "Security" light coming on?. If so, there is a problem with the Passlock key antitheft system. It is common for the ignition cylinder key detection contacts to go bad.

Replacing the key cylinder fixes the problem. The new cylinder has to be "relearned". See the internet and search for "2004 Chevrolet passlock system relearn procedure".

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sounds Like the Body control module is goin and check your grounds for being Loose and see the could also be in the wiring Harness is a short or the dash panel is shorting out out first by used one then see what happens ther cheap

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1 Answer

2004 Impala, the "security" light


It means there is a security issue with the vehicle.Most likely your passlock sensor in your ignition switch is sending the bcm false voltage readings causing the light to come on.You may want to get this checked out because it could leave you stranded if the sensor gets worse.Another issue could be the bcm is getting wet from a water leak in the vehicle.

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For the last five years that I have owned my 2004 Chevy Impala I have had problems with it not wanting to start at certain times, usually and mostly during the summer months, but not all the time. I get...


I had the same thing happen to my impala. It was the sensor in the ignition switch for security purposes. I had too many keys on my key ring, and it caused the ignition switch to not read my key right. Once I had the ignition switch repaired, I don't put so many keys on my key ring. It cost me about $300.

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While driving my 2005 impala the security light turn on once i turn the car of it wont sart .i turn on an off key an after awhile it will start


Sounds like an immobilizer problem, you need to get the car diagnostics done as it might not start at all one day

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If they come back on on their own, it could be a relay or circuit breaker. If there is a loose connection or bad ground they could be drawing higher amps than designed

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