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Periodically my 05 Silverado flashes a red battery warning light and a "Service Charging System" warning displays. The voltage then begins to fluctuate maybe 2-3 volts over and under 14v. Lights dim and brighten. Then warnings shut off and all is back to normal. This happens at least once a day or so for about a year. Hasn't gotten worse....any idea what problem is?

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The Rob. I'm on a budget. I'm ordering an OBD2 scanner from Amazon. I'm hoping I can clear it that way. I have a check engine light on as well. Evap solenoid is causing it.

*The Rob

Gahhhhhh!!! *thx Rob

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clearing it will do nothing ,here is a little diddy from the description and operation of the charging system


Service Charging System

The generator battery control module will send a class 2 message to the IPC
for the SERVICE CHARGING SYSTEM message to be displayed. It is commanded ON when
DTC B1390, B1488, B1492, or B1516 sets. The message is turned off when the
conditions for clearing the DTC have been met and after an ignition cycle.

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