crank position sensor.
If the CPS doesn't fix the "Starting Disabled" problem, start a new Post to see if someone has that problem.I would like to thank those who took the time to answer this post. I found this post after a quick search when my friend's 03 CTS 3.2L would not start. She was in a panic and I was the hero. Onstar reported a P2107 which turned out to be a dead end and there is no telling what the closest dealer 40 miles away would have charged for the tow. BTW, Onstar REALLY wanted to tow the car in... I had to practically beg for them to just read the DTC to me.
Anyway, 45 minutes and the car fired right up. From looking at other posts, we hope this will also solve the intermittent "Starting Disabled - Remove Key" condition that the dealer can not solve.