What are the common causes of P0B4D?

A short to power in the voltage sense D circuit. A failed battery pack voltage sense D sensor reading high. A battery pack running over voltage. Water in the voltage sense D connector.

Read battery pack voltage sense D on a scan tool. Check the sense D circuit for a short to power. Compare the sense D reading to actual pack voltage. Inspect the sense D connector for water or corrosion. Replace the sense D sensor if the reading stays high. Clear the code and retest.

P0B4D

Hybrid/EV Battery Voltage Sense D Circuit High

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

What it means

P0B4D means Hybrid/EV Battery Voltage Sense D Circuit High.

Check these first

A short to power in the voltage sense D circuit
A failed battery pack voltage sense D sensor reading high
A battery pack running over voltage
Water in the voltage sense D connector

What to do next

Read battery pack voltage sense D on a scan tool
Check the sense D circuit for a short to power
Compare the sense D reading to actual pack voltage
Inspect the sense D connector for water or corrosion
Replace the sense D sensor if the reading stays high
Clear the code and retest

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

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