P0C77 Possible Causes
- Faulty inverter with converter assembly
- Inverter with converter harness is open or short-circuited
- Inverter with converter assembly circuit poor electrical connection
- Faulty power management control ECU
What Does It Mean?
How to Fix Code P0C77
Check the “possible causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P0C77 Possible Symptoms
Check engine light on (or service engine soon warning light)
P0C77 Meaning
The inverter contains a three-phase bridge circuit, which consists of six power transistors (IGBT) for MG1 and MG2 each. The inverter converts high voltage DC current from the HV battery to three-phase AC current for the generator (MG1) and motor (MG2); it also converts three-phase AC current supplied by the generator (MG1) and motor (MG2) to DC current for the HV battery. The MG ECU controls the operation of the power transistors (IGBT). The inverter transmits necessary control information, such as current and voltage, to the MG ECU…