HSA Disable Method?
Looking through the GM service manual for the 2013 and found a note that may solve the HSA problem. There is a note that says the hill start assist feature will not operate if the stability control is disabled.
It is raining here so I am not going to go and test this until Sunday or Monday. If you get a chance to test this, please report back!
2013 AGM 2SS/RS/1LE-NPP
2002 Z28 Navy Blue A4 [traded]
1996 Camaro V6 Black [traded]