What are the common causes of P0B64?

An I circuit voltage reading outside the expected window. A drifting I voltage tap. A high resistance joint in the I sense lead. A weak cell at the I tap. A calibration fault in the I sense channel.

Compare I circuit voltage to adjacent taps. Monitor I voltage across a drive cycle. Inspect the I sense lead for added resistance. Test the I cell tap under load. Replace the sense module if I stays out of range. Clear the code and retest.

P0B64

Hybrid/EV Battery Voltage Sense I Circuit Range/Performance

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

What it means

P0B64 means Hybrid/EV Battery Voltage Sense I Circuit Range/Performance.

Check these first

An I circuit voltage reading outside the expected window
A drifting I voltage tap
A high resistance joint in the I sense lead
A weak cell at the I tap
A calibration fault in the I sense channel

What to do next

Compare I circuit voltage to adjacent taps
Monitor I voltage across a drive cycle
Inspect the I sense lead for added resistance
Test the I cell tap under load
Replace the sense module if I stays out of range
Clear the code and retest

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Updated

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