Powertrain, generic · Hybrid propulsion

P0B97 Hybrid/EV Battery Voltage Sense S Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With P0B97 the controller sees sense S pulled close to zero. In the 2012 two-mode trucks, where S is the nickel-metal hydride block 19, the battery pack control module only sets it when block 19 and block 20 are both below 2 V in 15 of 20 samples, Type B, with the 12 V system between 9 and 18 V. GM's lithium-ion packs work cell by cell: 0.2 V or less for 1.4 s in 2 s on the 2016 Volt and the 2019 controller, Type A, and under 0.20 V in 14 of 18 samples in the 16OBDG02 programme. The eAssist mild hybrid sets it below 1.4 V, 7 of 10 samples, Type B. An open sense line fault takes priority, so P0B97 points more to a short than to a broken lead.

Likely causes

Sense lead S shorted to ground or to the next lower cell
Defective channel S input on the monitoring board
Cell or NiMH block on channel S actually discharged

Symptoms

  • MIL and hybrid or EV warning message
  • Restricted power, engine may run more often on hybrids

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 swiring harnessbms

Related codes

P0B95P0B96P0B98P0B99P0B92P0B9C

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