engine stalls when really cold out

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by different.eli, Feb 1, 2026 at 4:59 AM.

  1. different.eli

    different.eli Junior Member

    Joined:
    Jan 25, 2024
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    Location:
    Vermont
    Vehicle:
    2012 Prius Plug-in
    Model:
    N/A
    used to be that very rarely on really cold nights (like below 0°) I would start the car and the engine would shudder so badly the whole car was shake so I would quickly turn it off and turn it back on and it would be fine.
    then at the beginning of this winter it would (occasionally) feel like it's almost stalling for a minute or two (really low idle), after it automatically started (for some reason) on really cold days. seemed fine once it warmed up.
    just now, -10° out, the engine would not stay running. it would start, run and sound normal, for 2 or 3 seconds and then turn off. check engine light comes on and it "says check hybrid system". unfortunately me but not my code reader are away from home right now.

    just looking for anything I can do myself on this Sunday or something very specific to tell a random mechanic to fix

    thanks for reading,
    eli.