P0A0C High Voltage System Interlock Circuit High

P0A0C indicates a high condition in the high-voltage system interlock circuit. The interlock feedback voltage or logic state is above the expected range.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System: Hybrid / EV
Scope: iso-sae-controlled-p0
Standard: SAE J2012 / ISO 15031-6
Source: legacy-import

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not treat a high interlock signal as harmless; confirm the safety loop is intact before returning the vehicle to service.

Useful checks before replacing parts

Review interlock feedback voltage, service plug position, high-voltage connector seating, battery cover status, freeze-frame data, and related hybrid codes.
Inspect for short-to-voltage faults, open grounds, crossed interlock wiring, connector damage, water intrusion, and incorrect repairs on high-voltage connectors.
Test the interlock loop with the high-voltage system disabled to confirm whether the high state is wiring, switch, or module related.

Related OBD-II codes

These nearby hybrid / ev entries can help compare wording and fault area. They may share the same verification status as the source database.