What are the common causes of P0B49?

A loose or corroded voltage sense C connector. Chafed wiring in the voltage sense C circuit. A battery pack cell going weak. A control module misreading the sense C signal.

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

P0B49

Hybrid/EV Battery Voltage Sense C Circuit Intermittent/Erratic

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

What it means

P0B49 means Hybrid/EV Battery 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
A battery pack cell going weak
A control module misreading the sense C signal

What to do next

Road test and watch battery pack voltage sense C data
Wiggle test the sense C connector and wiring
Test the battery pack cells for a weak cell
Check the sense C circuit for chafing
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.