Powertrain, generic · Hybrid propulsion

P0B83 Hybrid/EV Battery Voltage Sense O Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B83 reports that channel O reads implausibly low. It is not the same as an open lead: GM's lithium-ion controllers run this check only while no open sense line fault is present, so a broken wire shows as P0B81 instead. The low limit there is 0.2 V or less for 1.4 s within 2 s, Type A. The BAS Plus mild hybrid sets it below 1.4 V in 7 of 10 samples, Type B. On the 2012 two-mode trucks, where O is NiMH block 15, block 15 and block 16 must both be under 2 V for 15 of 20 samples, Type B, with the 12 V supply between 9 and 18 V. Short circuits in the sense path towards ground or a lower cell are the main suspects; a genuinely dead cell is the exception and usually brings neighbouring codes as well.

Likely causes

Short in the O sense path towards ground or a lower cell
Monitoring input reading low
Dead cell or NiMH block 15

Symptoms

  • MIL and hybrid warning lamp
  • Electric operation switched off

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 owiring harnessbms

Related codes

P0B81P0B82P0B84P0B85P0B7EP0B88

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