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OBD-II · Engine and powertrain (P)

P0A0A

High-voltage interlock circuit fault

What it means

The safety loop that confirms all high-voltage connectors and covers are closed has been interrupted, so the system blocks high voltage.

Symptoms

  • Hybrid/EV warning light
  • Car will not go into READY or drive mode

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01service plug / disconnect not fully seated
02high-voltage connector or inverter cover not fully fitted after work
03corroded or damaged interlock wiring
04faulty interlock switch in a high-voltage component

What to check, step by step

  1. 01Ask whether any high-voltage work was done recently
  2. 02Have a high-voltage qualified technician check the service plug and all high-voltage connector locks and covers
  3. 03Check interlock wiring continuity
  4. 04Clear codes and re-test