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P0C78 Severity
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
The high voltage system is controlled by two high voltage contactors that act like switches for the high voltage battery. When the vehicle is off, both switches are open. When the vehicle is turned on, the first switch (Pre-charge Switch) closes, allowing the high voltage to start powering up the rest of the vehicle. If the first switch fails to operate properly, code P0C78 is stored.
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OBD-II Code Wiring issue is defined as a Hybrid Battery System Precharge Time Too Long
The high voltage system is controlled by two high voltage contactors that act like switches for the high voltage battery. When the vehicle is off, both switches are open. When the vehicle is turned on, the first switch (Pre-charge Switch) closes, allowing the high voltage to start powering up the rest of the vehicle. If the first switch fails to operate properly, code P0C78 is stored.