P0A72 Boost Voltage System Voltage Sensor Circuit Intermittent

P0A72 indicates an intermittent boost voltage system voltage sensor circuit fault. Boost voltage feedback becomes invalid only under certain conditions.

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 clear intermittent boost voltage sensor faults without checking connector retention and harness movement.

Useful checks before replacing parts

Review freeze-frame load, boost command, road vibration, temperature, regeneration events, and related intermittent voltage sensor or converter codes.
Inspect connector pin fit, shielded harness flex points, moisture intrusion, loose grounds, heat damage, and routing near high-voltage cables.
Wiggle-test low-voltage sensor wiring only where safe while graphing boost voltage data for spikes, dropouts, or false readings.

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.