Powertrain, generic · Hybrid propulsion

P0B82 Hybrid/EV Battery Voltage Sense O Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B82 is a plausibility verdict on channel O. GM's 2016 program with a battery sense module asks cell O to trend at least 0.002 V in the direction of the average whenever the average moves by more than 0.022 V; 35 failed evaluations out of 40 set a Type A code. The 2019 controllers use the same logic with 0.005 V. Where O is NiMH block 15, on the 2012 two-mode hybrids, the battery pack control module multiplies blocks 15 and 16 by twenty and compares the result with the pack voltage, failing beyond 70 V in 160 of 170 samples, Type B. The BAS Plus mild hybrid needs half the average movement, 20 of 40, Type B. Low, high and open faults on the same channel are reported separately as P0B83, P0B84 and P0B81.

Likely causes

Channel O reading frozen in the monitoring electronics
Battery controller software fault
Rising resistance in the O sense tap distorting the reading

Symptoms

  • MIL with otherwise normal driving
  • State of charge display jumps or is inaccurate

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–5,000
Time0.5–6 h

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

Parts involved

hv battery voltage sense owiring harnessbms

Related codes

P0B81P0B83P0B84P0B85P0B7DP0B87

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