What does code P0C77 mean?

Q: What does code P0C77 mean?

Hybrid/EV Battery System Precharge Time Too Short. P0C77 means the hybrid or electric vehicle's battery management system commanded the high-voltage precharge circuit to close and bring the inverter bus up to pack voltage, but the bus reached its target faster than the expected precharge time window. The computer interprets this abnormally quick rise as a precharge resistor that is not limiting current as designed, or a circuit that is bypassing the resistor entirely.

DTC codes / P0Cxx · Hybrid propulsion / P0C77

P0C77Hybrid/EV Battery System Precharge Time Too Short

P0C77 means the hybrid or electric vehicle's battery management system commanded the high-voltage precharge circuit to close and bring the inverter bus up to pack voltage, but the bus reached its target faster than the expected precharge time window. The computer interprets this abnormally quick rise as a precharge resistor that is not limiting current as designed, or a circuit that is bypassing the resistor entirely.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.