2012 Avalanche voltage charging problems

[richard234]

Voltmeter dropped to 9 o'clock when remote start use. Air conditioner was on, high fan selected, and it was about 30 degrees C at the time. Motor went into high idle at the same time. When ignition was turned on, the voltmeter went to normal and idle went to normal. Have read your forum about adaptive system charging and I see some of this happening although the voltmeter dropping to about three sixteenths of an inch to the left of 12 o'clock in normal driving is a little disturbing. The problem above has only happened once. Thoughts?
thank you
richard234

[swathdiver]

On 9/14/2020 at 1:02 PM, richard234 said:

Voltmeter dropped to 9 o'clock when remote start use. Air conditioner was on, high fan selected, and it was about 30 degrees C at the time. Motor went into high idle at the same time. When ignition was turned on, the voltmeter went to normal and idle went to normal. Have read your forum about adaptive system charging and I see some of this happening although the voltmeter dropping to about three sixteenths of an inch to the left of 12 o'clock in normal driving is a little disturbing. The problem above has only happened once. Thoughts?
thank you
richard234

Richard, look up the terms RVC and EPM.  The charging system in our trucks is smart and monitors the health and charging state of the battery and these can be seen with a bi-directional scan tool in the BCM.  The 2009 or 2013 Electrical Upfitter's Guides have excellent information on this that you can download from GM.