What are the common causes of P0B71?

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

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

P0B71

Hybrid/EV Battery Voltage Sense K Circuit Intermittent/Erratic

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

What it means

P0B71 means Hybrid/EV Battery Voltage Sense K Circuit Intermittent/Erratic.

Check these first

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

What to do next

Road test while graphing K circuit voltage
Wiggle test the K connector and harness
Check K sense lead continuity while flexing it
Inspect the K pins for corrosion
Repair the K 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.