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Old 04-26-2013, 06:22 PM   #3
13 ZL1
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Drives: 2013 IOM ZL1
Join Date: Nov 2009
Location: Manteca CA
Posts: 658
Originally Posted by MPHS_AGM View Post
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!
This doesn't work on my car. I tried PTM Mode 5 in my driveway today and HSA was still active.
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