Powertrain, generic · Hybrid propulsion

P0BA7 Hybrid/EV Battery Voltage Sense V Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0BA7 is the high-voltage plausibility code for channel V. The battery controller compares the measured value against a ceiling no healthy cell should reach: 4.8 V for 1.4 s within 2 s in GM's 2016 Volt and ELR and in the 2019 battery energy control module (Type A), 4.90 V in 14 of 18 samples of 100 ms in the 16OBDG02 programme (Type A), and 4.65 V in 7 of 10 samples in the eAssist mild hybrid (Type B). Each of these checks waits for the open sense line monitor to pass. A high reading usually comes from a sense lead V pressed against a higher cell tab or busbar, or from a measuring chip that has lost its reference, and only rarely from a cell actually overcharged.

Likely causes

Sense lead V touching a higher cell tab or busbar
Measuring chip with faulty reference reading channel V high
Cell V really overcharged

Symptoms

  • MIL and hybrid or EV warning
  • Charging and regeneration reduced

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

P0BA4P0BA5P0BA6P0BA8P0BA2P0BAC

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