If the starter is accessible, while someone is trying that hot start, tap it with a hammer/ pry bar etc.. If it starts, it's the starter.. Typical GM starter issue. Also, you can typically jump the solenoid and see if that works as well.. I used a screwdriver to start my last old GM product many a time to jump across the 2 terminals on the solenoid when it did that..

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Sharing my partner's 2012 Forte 5dr SX til I find my next 123 or 126..
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Do I miss being a service advisor ???