What are the common causes of P0A0B?

A faulty high voltage interlock A sensor. A short in the interlock A circuit. Corrosion in a high voltage connector. A fault in the high voltage system control module. A software or calibration issue in the control module.

Inspect the high voltage interlock A circuit and connectors. Check high voltage connectors for corrosion. Read high voltage system live data. Verify the control module software version. Reprogram or replace the high voltage control module if faulty. Clear the code and retest.

P0A0B

High Voltage System Interlock Circuit A Performance

System: Powertrain control (P code)
Lamp: Check Engine Light
Category: Powertrain - Hybrid Propulsion

What it means

P0A0B means High Voltage System Interlock Circuit A Performance.

Check these first

A faulty high voltage interlock A sensor
A short in the interlock A circuit
Corrosion in a high voltage connector
A fault in the high voltage system control module
A software or calibration issue in the control module

What to do next

Inspect the high voltage interlock A circuit and connectors
Check high voltage connectors for corrosion
Read high voltage system live data
Verify the control module software version
Reprogram or replace the high voltage control module if faulty
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.