Powertrain, generic · Hybrid propulsion

P0BA6 Hybrid/EV Battery Voltage Sense V Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

A sense V reading that collapses towards zero produces P0BA6. The threshold depends on the system: GM's eAssist mild hybrid uses under 1.4 V in 7 of 10 samples with at least 8.8 V on the 12 V side, Type B, while GM's lithium-ion battery controllers of 2016 and 2019 go down to 0.2 V or less for 1.4 s within 2 s, Type A. The 16OBDG02 programme sets it below 0.20 V in 14 of 18 samples. Because these tests are blocked by an active open sense line fault, P0BA4 would be reported first if the lead were simply broken; P0BA6 alone tends to mean a short to a lower potential or a failed input. The driver sees a hybrid or EV warning and reduced power.

Likely causes

Sense lead V shorted to ground or a lower cell
Monitoring board input for channel V failed
Cell V genuinely collapsed

Symptoms

  • MIL and service hybrid or EV system message
  • Power limited, restart may be refused

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–6,000
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery voltage sense vwiring harnessbms

Related codes

P0BA4P0BA5P0BA7P0BA8P0BA1P0BAB

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.