What does code P0B85 mean?

DTC codes / P0Bxx · Hybrid propulsion / P0B85

P0B85Hybrid/EV Battery Voltage Sense O Circuit Intermittent/Erratic

P0B85 indicates that the hybrid or electric vehicle battery pack's voltage sensing circuit for the 'O' position is reporting an intermittent or erratic signal to the battery energy control module. The computer detects this when the voltage reading from that specific sense circuit jumps, drops out, or otherwise fails to remain stable within the expected range during normal operation.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.