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Just a data point. My 6 week old 2017 Volt started displaying the "Reduced Propulsion" messages, and eventually "Shift to Park" with the solid amber Check Engine Light. Once I'd done that it wouldn't restart until OnStar gave me a reset sequence. It turned out that the "Drive Motor Control Module" had no coolant, which the dealer traced to a bad seal. Dealer was great, but I can't say I'm impressed with OnStar. The first time it displayed RP (a few days prior) they managed to disconnect me and wipe the codes, so it wasn't until it repeated that I had anything to tell the dealer. Mind you, OnStar still couldn't see any codes even while I was stuck on the side of the road, nor see anything wrong in their diagnostics. But by then I'd gotten my own OBD2 and could see the codes for myself. They included p0c14, p0c15.

Could have put this on the other RP thread, but it seemed to be a clearly different cause.
 

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Wiped the codes ? from their computer screen or you car ?

Generally when a cell call gets disconnected I blame Sprint ;-) Yes I know onstar does not use Sprint.

but good to know that a drop in connection can erase car data.
 

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2016 Volt Premier, delivered Oct/15
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Reset sequence?

Curious as to what the reset sequence Onstar gave you. I had the same issue last year and they gave me nothing but grief.
Just a data point. My 6 week old 2017 Volt started displaying the "Reduced Propulsion" messages, and eventually "Shift to Park" with the solid amber Check Engine Light. Once I'd done that it wouldn't restart until OnStar gave me a reset sequence. It turned out that the "Drive Motor Control Module" had no coolant, which the dealer traced to a bad seal. Dealer was great, but I can't say I'm impressed with OnStar. The first time it displayed RP (a few days prior) they managed to disconnect me and wipe the codes, so it wasn't until it repeated that I had anything to tell the dealer. Mind you, OnStar still couldn't see any codes even while I was stuck on the side of the road, nor see anything wrong in their diagnostics. But by then I'd gotten my own OBD2 and could see the codes for myself. They included p0c14, p0c15.

Could have put this on the other RP thread, but it seemed to be a clearly different cause.
 

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The reset sequence they gave me after the car wouldn't start was: long press on Start button until screens dimmed, then open the driver's side door for ~15 seconds. Then it would start normally.

As for OnStar clearing the codes, what I know is this: when I called after the first Propulsion Reduced message, a few days prior to the real shutdown, they said there were codes showing. Then they tried to transfer me to the Volt Specialists and we were disconnected. When I called them back they said there were no codes (which I confirmed with my own OBD2 a few days later). I suppose it's possible that he was mistaken, and there were no codes in the first place, but it seems unlikely it would display the Propulsion Reduced error without throwing a code (especially knowing now that there was a real problem brewing). The fact that they then couldn't read the codes off the car later, when I knew they were present, makes me wonder about their whole system. Too bad... it was a golden opportunity for OnStar to convince me to re-up when the subscription expired. Doesn't seem likely now.
 

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Unfortunately that's the state of remotely trying to diagnose complicated machines. That's another reason OTA updates may not be the best way to do things.

There is nothing like having a human actually looking and touching something before deciding how to fix it. In their defense OnStar can only do so much. Glad your dealer was able to fix your problem and get you back on the road.
 
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