DTC P1C77-79: Engine Failed to Start Mechanical Linkage Failure [04/2018 - 08/2020]: Caution/Notice/Hint
WARNING: This page is about a different car, the 2020 Toyota Avalon and 2019 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
If this DTC is output, the engine or gears in the transaxle may have seized. Before performing this inspection, check the engine oil, hybrid transaxle fluid, coolant (for Engine) and coolant (for Inverter) levels.