P1EF3 - Battery Charger High-Voltage Converter 1 Temperature Too High

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Battery Charger
  • Battery Charger harness is open or shorted
  • Battery Charger circuit poor electrical connection

Possible symptoms

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

P1ef3 Description

The battery charger uses a liquid cooled cooling system which is cooled from the front of the vehicle. The hybrid electronic cooling system needs to be functioning properly for the battery charger to be able to meet its temperature requirements.

The hybrid/EV powertrain control module 2 monitors the battery charger temperature and verifies it is within its proper operating range. There is a temperature sensor that measures the overall temperature of the battery charger. Also, there are battery charger internal temperatures sensors that monitor for over-temperature conditions, that are for the voltage converter 1, voltage converter 2 and the voltage conditioner within the battery charger.

OBDII Code P1ef3 - Battery Charger High-Voltage Converter 1 Temperature Too High - AutoCodes.com

P1EF3 Information for specific makes

  • P1EF3 BUICK Battery Charger High-Voltage Converter 1 Temperature Too High
  • P1EF3 CADILLAC Battery Charger High-Voltage Converter 1 Temperature Too High
  • P1EF3 CHEVROLET Battery Charger High-Voltage Converter 1 Temperature Too High
  • P1EF3 GMC Battery Charger High-Voltage Converter 1 Temperature Too High
  • P1EF3 SATURN Battery Charger High-Voltage Converter 1 Temperature Too High

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Related Information

P1EF3 Comments

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