OBD-II code · Powertrain (generic)
P0C77 Hybrid/EV Battery System Precharge Time Too Short
The HV battery system precharge time is shorter than the calibrated window. Indicates short circuit or low resistance path.
Is it safe to drive with P0C77?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyShort on DC-link
- PossibleCharge resistor shorted
- Less likelyPack cell imbalance approaching service threshold
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–10 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery System, Precharge Resistor, Main Contactors
Related codes
- P0C74Motor Electronics Coolant Pump B Control Performance
- P0C75Hybrid/EV Battery System Discharge Time Too Short
- P0C76Hybrid/EV Battery System Discharge Time Too Long
- P0C78Hybrid/EV Battery System Precharge Time Too Long
- P0C79Drive Motor A Inverter Voltage Too High
- P0C7ADrive Motor B Inverter Voltage Too High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.