Thread: 2005 GTP full throttle battery drop

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  1. #1 2005 GTP full throttle battery drop 
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    I have a 2005 grand prix GTP and when I punch the throttle to pass or do a speed pass the charging system failure light comes on and my battery voltage drops from 14.2 to below 9 and the car loses power once I let off and go back to driving normal the battery charges fine again boost gauge only gets to about three quarters of the gauge as well on the DIC I believe it used to peg the gauge when punching it. Please help I love this car but it's annoying. Also with car on accessory the battery sits at 12.29 volts
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  2. #2 Re: 2005 GTP full throttle battery drop 
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    couple of things im thinkin:
    clean battery terminals and grounds. check alt terminals. have battery load tested and test the alternator.
    08 grand prix NA3800
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  3. #3 Re: 2005 GTP full throttle battery drop 
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    Cables are clean 0 corrosion on them also every once in a while my rpm,fuel,temp,boost gauge quit working for like 5 mins then after restarting the car it well work again my obd 2 port also quits working. During. This the lights slightly dim
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  4. #4 Re: 2005 GTP full throttle battery drop 
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    Cables seem good I'll check grounds battery has never given me problems.. also every once in a while my rpm,fuel,temp,boost gauges die and my obd2 port quits working as well until I restart the car.
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  5. #5 Re: 2005 GTP full throttle battery drop 
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    Batteries good cables are good also having a problem where the rpm,temp,boost,and obd2 port quit working for about 5-10 minutes with slight light dimming then after restarting everything works again
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