Powertrain, generic · Hybrid propulsion

P0B1F Hybrid/EV Battery Pack Voltage Sense D Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B1F says pack voltage measurement D is electrically present but disagrees with what the controller expects, typically the sum of cell voltages or a parallel pack measurement. It is a plausibility fault, not an open or shorted circuit. No manufacturer documents P0B1F publicly. GM's analogous channel A check, P0ABB, fails at a deviation above 12 V from the summed cell voltages for 20 of 25 samples at 25 ms, Type A, one trip. CARB requires rationality checks for battery voltage sensors of hybrid storage systems. Circuit faults of channel D use P0B1E, P0B20 and P0B21. With a doubtful pack voltage the controller narrows the usable battery window and limits power.

Likely causes

Drift or calibration error of measurement channel D
Cell voltage acquisition faulty, reference sum wrong
Increased resistance at sense terminals
Battery controller software needs an update

Symptoms

  • MIL and hybrid/EV system warning on
  • Implausible state-of-charge or range display
  • Battery power limited, reduced electric drive or assist

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–6 h

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

Parts involved

hv battery pack voltage sense dwiring harnessbms

Related codes

P0B1EP0B20P0B21P0B22P0B1AP0ABB

References: gsi.ext.gm.com, law.cornell.edu.