P0A8C Hybrid Battery Contactor Contacts Stuck

P0A8C indicates hybrid battery contactor contacts are stuck. The controller sees contactor voltage behavior that suggests contacts did not open or close correctly.

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 service contactors until the high-voltage battery is disabled and voltage is verified safe.

Useful checks before replacing parts

Compare contactor command, pack voltage, load-side voltage, precharge voltage, discharge behavior, freeze-frame data, and related contactor stuck codes.
Inspect contactor feedback wiring, welded contact symptoms, precharge circuit behavior, battery ECU command, 12-volt supply, and high-current event history.
Use service diagnostics to distinguish stuck contacts from biased voltage sensing or incorrect feedback.

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.