What are the common causes of P0B45?

An open or short in the sense C circuit wiring. A corroded sense C connector. A failed voltage sense module on circuit C. A degraded battery pack feeding sense C. The battery installed incorrectly so sense C misreads.

Inspect sense C wiring and connectors. Test sense C voltage and resistance against spec. Replace the failed sense C module. Update the control module software. Inspect the battery pack and replace if degraded. Clear the code and retest.

P0B45

Hybrid/EV Battery Voltage Sense C Circuit

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

What it means

P0B45 means Hybrid/EV Battery Voltage Sense C Circuit.

Check these first

An open or short in the sense C circuit wiring
A corroded sense C connector
A failed voltage sense module on circuit C
A degraded battery pack feeding sense C
The battery installed incorrectly so sense C misreads

What to do next

Inspect sense C wiring and connectors
Test sense C voltage and resistance against spec
Replace the failed sense C module
Update the control module software
Inspect the battery pack and replace if degraded
Clear the code and retest

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Updated

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