P0C78

Symptoms

• Hybrid system does not activate
• Check Engine light comes on
• A hybrid system fault message appears
• Reduced vehicle performance
• The car goes into emergency mode

Causes

• Faulty precharge relay
• Damaged pre-charge resistor
• Problems with high voltage battery
• Malfunction of the hybrid system control module
• Open or short circuit in the precharge circuit

How to Fix

1. Carry out diagnostics of the high-voltage system
2. Check relay and precharge resistor
3. Test the integrity of the precharge circuit
4. Check the condition of the high-voltage battery
5. Update or replace the control module if necessary
6. Repair only from an authorized dealer

Related codes

Error P0C78 by Vehicle Brand