Powertrain, generic · Hybrid propulsion

P0B92 Hybrid/EV Battery Voltage Sense R Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B92 stands for an implausibly low reading on sense R. In GM's lithium-ion battery controllers of 2016 and 2019 the limit is 0.2 V or less for 1.4 s inside a 2 s window, Type A; the test is suspended while an open sense line fault is active, so a broken lead appears as P0B90 rather than P0B92. Programmes with a separate battery sensor module (GM 16OBDG02) use under 0.20 V in 14 of 18 samples. The eAssist mild hybrid applies 1.4 V, 7 of 10 samples, Type B. In the 2012 two-mode trucks R is NiMH block 18, and blocks 18 and 19 must both read under 2 V in 15 of 20 samples (Type B). A short of the sense lead to ground or to a lower cell is the classic cause.

Likely causes

Sense lead R chafed through and touching ground or a lower cell
Failed input for channel R on the cell monitoring board
Cell or block on channel R genuinely collapsed

Symptoms

  • MIL and hybrid or EV system message
  • Propulsion limited, possibly no restart

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 rwiring harnessbms

Related codes

P0B90P0B91P0B93P0B94P0B8DP0B97

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