Hello! There are several possibilities...A Technical Service Bulletin written on July/08 shows the existence of the problem...Yes, they know about it and nothing more...It is TSB# 02-06-03-008D...
The meter in the dash is telling you "complete discharge", correct? When the idle drops are there any other signs...ie...Lights dim for instance...Or is the only indication of a problem the meter?...Lets eliminate the meter itself...There is a blocking diode installed in the instrument cluster that may be defective and actually the discharge is a lie...Using a voltmeter, Read the battery voltage with the engine off...Record reading...Start the engine and at idle take another reading...Voltage should be 1,8 to 2 volts higher...Increase RPM'S...Does the voltage rise or remain the same...Send readings...
The ground strap from the -battery terminal to the engine block/chassis may be corroded or loose causing a voltage drop at low RPM'S...Set scale of meter to X1 ohms...Engine off...Place one probe on the CENTER of the - battery terminal the other on the alternator mounting bracket...Must be zero ohms...Dead short...Send readings...
The Regulated Voltage Control Module is defective and needs to be replaced...Regulated voltage control is
new for the Vortec 4.2L and Vortec 5.3L engines. It enhances fuel
economy by reducing the load on the engine generated by the alternator...It is located on the center tunnel under the rear seat...Check the connector to see if any pins are bent and that it is properly seated...
guru......saailer
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
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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 serial data message from the body control module (BCM) indicating the system voltage.
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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
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