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.
The HV battery system precharge time is shorter than the calibrated window. Indicates short circuit or low resistance path.
Common causes
- high
Short on DC-link
One of the most commonly reported causes for this code — check this first.
Typical part cost: $440-3300
- medium
Charge resistor shorted
A plausible cause — test and verify before replacing parts.
Typical part cost: $440-3300
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P0C77 mean?
P0C77 means "Hybrid/EV Battery System Precharge Time Too Short". It is a generic OBD-II code that points to a fault in the hybrid / ev powertrain.
What are the most common causes of P0C77?
short on dc-link; charge resistor shorted; pack cell imbalance approaching service threshold — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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