Silverado 1500 4WD V8-6.0L Hybrid (2009)
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The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
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The ignition is ON, with the engine OFF.
Battery Voltage Gauge Operation
The IPC displays the system voltage as received from the BCM over the GMLAN serial data circuit. If there is no communication with the BCM then the
gauge will indicate minimum.
This vehicle is equipped with a regulated voltage control (RVC) system. This will cause the voltmeter to fluctuate between 12 and 14 volts, as opposed
to non-regulated systems which usually maintain a more consistent reading of 14 volts. This fluctuation with the RVC system is normal system operation
and NO repairs should be attempted.
SERVICE BATTERY CHARGING SYSTEM
The BCM and the ECM will send a GMLAN message to the DIC for the SERVICE BATTERY CHARGING SYSTEM message to be displayed. It is
displayed whenever the charge indicator is commanded ON due to a failure.
