What are the common causes of P0B1D?

A loose or corroded voltage sense C connector. Chafed wiring in the voltage sense C circuit. Water in the voltage sense C connector. A battery pack cell going weak.

Road test and watch battery pack voltage sense C data. Wiggle test the sense C connector and wiring. Inspect the sense C connector for water or corrosion. Test the battery pack cells for a weak cell. Replace the sense C sensor if the signal drops. Clear the code and retest.

P0B1D

Hybrid/EV Battery Pack Voltage Sense C Circuit Intermittent/Erratic

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

What it means

P0B1D means Hybrid/EV Battery Pack Voltage Sense C Circuit Intermittent/Erratic.

Check these first

A loose or corroded voltage sense C connector
Chafed wiring in the voltage sense C circuit
Water in the voltage sense C connector
A battery pack cell going weak

What to do next

Road test and watch battery pack voltage sense C data
Wiggle test the sense C connector and wiring
Inspect the sense C connector for water or corrosion
Test the battery pack cells for a weak cell
Replace the sense C sensor if the signal drops
Clear the code and retest

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Updated

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