Powertrain, generic · Hybrid propulsion

P0B96 Hybrid/EV Battery Voltage Sense S Circuit Range/Performance

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0B96 is a plausibility code: the voltage of sense S looks electrically valid but fails to track the rest of the pack. GM's eAssist mild hybrid requires cell S to move at least half as much as the other cells once the average changes by more than 0.045 V, judged over 20 of 40 samples at 200 ms, Type B. The 16OBDG02 programme accepts a trend of 0.002 V and sets Type A after 35 of 40 evaluations, while the 2019 hybrid processor wants 0.005 V. On the 2012 two-mode trucks S is block 19, and the check scales blocks 19 and 20 by twenty and compares them with the pack voltage, with more than 70 V deviation in 160 of 170 samples leading to Type B. Circuit, low and high faults of S are excluded first.

Likely causes

Measuring channel S frozen or lagging behind the other cells

Battery controller calibration requiring a software update

Block 19 or 20 out of step with the pack on two-mode NiMH batteries

Symptoms

MIL with little or no change in driving
Electric assist reduced at times

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 swiring harnessbms

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