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G.M. has used a start/stop system in several vehicles in 2014 and 2015. These are dual battery setups. Charging the main battery should be as I described, through the BSM. If the charge procedure is performed incorrectly or if the battery has been replaced, a BSM reset/learn should be performed. This is done with the scan tool.

In 2016 and 2017, the start/stop system is different. The dual battery system is no longer used and either the 12v power module or the super capacitor system is used. This saves adding another battery in the trunk. The charging method is as described. The BSM reset/learn is no longer available in the scan tool and the vehicle needs to sit for 3 hours instead for a power on reset to take place.

James Avery
Technician/Technical Information Specialist
Stingray Chevrolet
Plant City, Florida, USA