What are the common causes of P0BA3?

A U terminal backing out of its connector. A broken strand in the U sense lead. A U tap that opens as the pack shifts. Corrosion bridging the U connector pins. A cold solder joint at the U module pin.

Road test while graphing U circuit voltage. Wiggle test the U connector and harness. Check U sense lead continuity while flexing it. Inspect the U pins for corrosion. Repair the U circuit if the signal cuts out. Clear the code and retest.

P0BA3

Hybrid/EV Battery Voltage Sense U Circuit Intermittent/Erratic

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

What it means

P0BA3 means Hybrid/EV Battery Voltage Sense U Circuit Intermittent/Erratic.

Check these first

A U terminal backing out of its connector
A broken strand in the U sense lead
A U tap that opens as the pack shifts
Corrosion bridging the U connector pins
A cold solder joint at the U module pin

What to do next

Road test while graphing U circuit voltage
Wiggle test the U connector and harness
Check U sense lead continuity while flexing it
Inspect the U pins for corrosion
Repair the U circuit if the signal cuts out
Clear the code and retest

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Updated

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