BMW i4

P0BC0

Critical

High Voltage Battery Isolation Fault (Ground Fault)

Severity
Critical
Category
Battery
Code Type
Manufacturer Specific
Applicable Regions
EU, US

What does P0BC0 mean?

Fault code P0BC0 means "High Voltage Battery Isolation Fault (Ground Fault)". This is a Volkswagen-specific EV diagnostic trouble code for the VW MEB platform. It is classified as "battery" with a severity level of "critical". Applicable models: ID.3, ID.4, ID.5, ID.7, ID.Buzz. [BMW EV-specific: High Voltage Battery Ground Fault / Isolation Loss. Applies to: BMW i4 (2022+), BMW iX1 (2022+), BMW iX3 (2020+), BMW i5 (2023+), BMW iX (2021+)] [General Motors EV-specific: High Voltage System Ground/Isolation Fault. Applies to: Chevrolet Equinox EV (2024+), Chevrolet Blazer EV (2024+), Honda Prologue (2024+), Cadillac Lyriq (2023+), Chevrolet Silverado EV (2024+)] [Ford EV-specific: High Voltage System Ground Fault / Isolation Loss. Applies to: Ford F-150 Lightning (2022+), Ford Mustang Mach-E (2021+), Ford E-Transit (2022+)] [Volkswagen Group (MEB) EV-specific: High Voltage Battery Ground/Isolation Fault. Applies to: VW ID.3, VW ID.4, VW ID.5, VW ID.7, Skoda Enyaq, Skoda Elroq] [Audi EV-specific: High Voltage Battery Isolation/Ground Fault. Applies to: Audi Q6 e-tron (2024+), Audi SQ6 e-tron (2024+), Porsche Macan EV (2024+), Audi Q4 e-tron (2021+), Audi Q4 Sportback e-tron (2021+)]

Possible Causes

  • Battery management system (BMS) malfunction
  • High voltage battery cell imbalance
  • Battery temperature sensor fault
  • High voltage contactor failure

Recommended Actions

  1. 1 Stop driving immediately and park in a safe location
  2. 2 Do not attempt to restart the vehicle
  3. 3 Contact roadside assistance or authorized dealer
  4. 4 Have the vehicle towed to an authorized service center

This is a critical fault code. Pull over safely and seek immediate professional assistance.

This code applies to all vehicles. View generic P0BC0 information →