Powertrain, generic · Hybrid propulsion

P0B15 Hybrid/EV Battery Pack Voltage Sense B Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B15 marks pack voltage measurement B as electrically valid but implausible: the value lies within the sensor range yet does not match a reference, typically the sum of the cell voltages or another pack measurement. No manufacturer documents this code publicly. GM shows the principle on channel A: P0ABB fails when pack voltage and summed cell voltages differ by more than 12 V, 20 of 25 samples at 25 ms, Type A, one trip. CARB demands rationality checks for battery voltage sensors of the hybrid storage system. Hard circuit faults of channel B are P0B14, P0B16 and P0B17. Because state of charge and cell protection rely on this value, the controller restricts power or charging.

Likely causes

Drift or calibration error of measurement channel B
Faulty cell voltage acquisition distorts the reference sum
Increased contact resistance at sense terminals
Battery controller software needs an update

Symptoms

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

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 bwiring harnessbms

Related codes

P0B14P0B16P0B17P0B18P0ABBP0B1A

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