What are the common causes of P0B4A?

An open or short in the voltage sense D circuit. A failed battery pack voltage sense D sensor. Corrosion in the voltage sense D connector. High electrical load dropping pack voltage.

Read battery pack voltage sense D on a scan tool. Check the sense D circuit for an open or short. Measure the sense D voltage against pack voltage. Check for excess electrical load. Replace the sense D sensor if the circuit tests good. Clear the code and retest.

P0B4A

Hybrid/EV Battery Voltage Sense D Circuit

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

What it means

P0B4A means Hybrid/EV Battery Voltage Sense D Circuit.

Check these first

An open or short in the voltage sense D circuit
A failed battery pack voltage sense D sensor
Corrosion in the voltage sense D connector
High electrical load dropping pack voltage

What to do next

Read battery pack voltage sense D on a scan tool
Check the sense D circuit for an open or short
Measure the sense D voltage against pack voltage
Check for excess electrical load
Replace the sense D sensor if the circuit tests good
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.