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Engine-Codes - Generic - P0C78

P0C78 - Hybrid Battery System Precharge Time Too Long

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P0C78 Possible Causes

What does this mean?
  • Faulty Inverter with converter assembly
  • Inverter with converter assembly harness is open or shorted
  • Inverter with converter assembly circuit poor electrical connection
  • Faulty Power management control ECU

How is the P0C78 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P0C78 code

Labor: 1.0

The cost to diagnose the P0C78 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0C78 Meaning

The inverter contains a three-phase bridge circuit, which consists of six power transistors (IGBTs) each for MG1 and MG2. The inverter converts high-voltage direct current from the HV battery into three-phase alternating current for generator (MG1) and motor (MG2); it also converts three-phase alternating current supplied by generator (MG1) and motor (MG2) into direct current for the HV battery. The MG ECU controls the actuation of the power transistors (IGBTs). The inverter transmits information necessary for control, such as amperage and voltage, to the MG ECU.

More Information

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Information for specific makes

  • P0C78 BUICK Hybrid/EV Battery System Precharge Time Too Long
  • P0C78 CADILLAC Hybrid/EV Battery System Precharge Time Too Long
  • P0C78 CHEVROLET Hybrid/EV Battery System Precharge Time Too Long
  • P0C78 GMC Hybrid/EV Battery System Precharge Time Too Long
  • P0C78 LEXUS Hybrid Battery System Precharge Time Too Long
  • P0C78 TOYOTA Hybrid Battery System Precharge Time Too Long

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