P0A70 Boost Voltage System Voltage Sensor Circuit

P0A70 indicates a boost voltage system voltage sensor circuit problem. The controller cannot trust the sensor used to measure boosted high-voltage supply.

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 probe high-voltage circuits directly without manufacturer-approved tools, disable steps, and voltage verification.

Useful checks before replacing parts

Compare boost voltage sensor data with pack voltage, inverter voltage, converter command, freeze-frame load, and related voltage sensor or converter codes.
Inspect sensor wiring, low-voltage connector terminals, reference or ground circuits, water intrusion, shielding, and high-voltage connector condition.
Verify sensor plausibility through service-approved measurements or data comparisons before replacing boost converter components.

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.