Toyota Prius Owner's Manual page 47

Hybrid warning message
A message is automatically displayed when a malfunction occurs in
the hybrid system or an improper operation is attempted.
PRIUS_OM_OM47A19E_(EE)
If a warning message is shown
on the multi-information display,
read the message and follow the
instructions. (P. 510)
1-1. Hybrid system
1
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