What are the common causes of P0B8F?

A Q terminal backing out of its connector. A broken strand in the Q sense lead. A Q tap that opens as the pack shifts. Corrosion bridging the Q connector pins. A cold solder joint at the Q module pin.

Road test while graphing Q circuit voltage. Wiggle test the Q connector and harness. Check Q sense lead continuity while flexing it. Inspect the Q pins for corrosion. Repair the Q circuit if the signal cuts out. Clear the code and retest.

P0B8F

Hybrid/EV Battery Voltage Sense Q Circuit Intermittent/Erratic

System: Powertrain control (P code)
Lamp: Check Engine Light
Category: Powertrain - Hybrid Propulsion

What it means

P0B8F means Hybrid/EV Battery Voltage Sense Q Circuit Intermittent/Erratic.

Check these first

A Q terminal backing out of its connector
A broken strand in the Q sense lead
A Q tap that opens as the pack shifts
Corrosion bridging the Q connector pins
A cold solder joint at the Q module pin

What to do next

Road test while graphing Q circuit voltage
Wiggle test the Q connector and harness
Check Q sense lead continuity while flexing it
Inspect the Q pins for corrosion
Repair the Q circuit if the signal cuts out
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.