Question about 2003 GMC Sierra 2500HD

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2003 gmc battery light flashes

Battery light flashes and information says battery not charging

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  • clyde Jan 24, 2013

    all ready tested battery and alternator.all passed.should be a wire to ecm and to dash,but have no wiring diagram to find out which wire and pins i need to be looking at.also this seems to be a common problem,

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Check alternator to see if charging. Replace if necessary.

Check battery, may have broken plates and not holding charge. Replace if necessary.

Posted on Jan 21, 2013

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Posted on Jan 02, 2017

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The charging system on your vehicle is Computer controlled . called ( smart charging system )
BATTERY NOT CHARGING
The IPC illuminates the battery not charging indicator in the driver information center when the following occurs:
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• The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.

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Hi amacias1 am,

This problem is either one or both of two common problems

The less expensive:
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2)your battery doesn't hold a charge anymore and it will need replacing.
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you should look into getting this looked at by a trusted mechanic, your car may turn off on you unexpectedly while youre driving if you battery cannot keep up with the demand.

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