Engine-Codes - GMC - P0C78 GMC

P0C78 GMC Code - Hybrid/EV Battery System Precharge Time Too Long

- Code Popularity: 314 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P0C78 GMC?

  • Faulty Hybrid/EV Battery Pre-Charge Resistor
  • Faulty Starter/Generator Control Module
  • Starter/Generator Control Module harness is open or shorted
  • Starter/Generator Control Module circuit poor electrical connection

|How to Fix the P0C78 GMC Code?

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 Code P0C78 GMC?

Labor: 1.0

The cost to diagnose the P0C78 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

Does your GMC have Safety Recalls? → Check here

|What are Code P0C78 GMC Possible Symptoms?

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

|What Does the P0C78 GMC Code Mean?

The hybrid battery system voltage is controlled by two high voltage contactors. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the Hybrid/EV Battery Pack assembly. Of the two contactors, one is a pre-charge contactor and the other is the primary contactor. The two contactors are closed in a specific sequence by the Starter/Generator Control Module. The pre-charge contactor is closed first. This causes high voltage to flow through the pre-charge resistor, allowing system voltage to build slowly. Once the system voltage has raised and stabilized, the primary contactor is closed. Both contactors are controlled by the Starter/Generator Control Module. The Starter/Generator Control Module supplies B+ to each contactor at all times. When the contactors are to be closed, the Starter/Generator Control Module will provide a ground to the contactor through a low side driver.

P0C78 GMC Code - Hybrid/EV Battery System Precharge Time Too Long

|Need more Information on the P0C78 GMC Code?

Need more information on how to fix the P0C78 GMC code? Get Access to Factory Service Manuals

|Need Help with the P0C78 GMC Code?

Get the P0C78 GMC code diagnosed by a professional: Find a repair shop in your area