My Spark started doing some funny things, I did some googling, and I found this thread: https://www.mychevysparkev.com/forum/vi ... php?t=4880
The "Propulsion Power Reduced" error is exactly as described there (still intermittent for me at the moment), and the OP's ultimate solution was to have the dealer replace a bad ECM/PCM module. I'm wondering if I can get ahead of this before my car fails entirely, and if anyone has experience replacing this computer themselves?
Another user later in the thread had a similar issue and needed their entire battery pack replaced.... I'm not even going to go there yet.