Powertrain, generic · Hybrid propulsion

P0B19 Hybrid/EV Battery Pack Voltage Sense C Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Voltage sense C is the third of up to four pack voltage measurements defined in SAE J2012. P0B19 is its general circuit code and sets when the battery controller finds this input electrically unusable, for instance open or without a valid raw value. Which measuring point a manufacturer assigns to C is its own choice. No manufacturer documents P0B19 publicly. GM shows the principle for channel A, checking pack-side voltage against limits and against the summed cell voltages (P0ABB to P0ABD). CARB requires battery voltage sensors of hybrid storage systems to be monitored as input components. The detailed fault types of channel C are P0B1A to P0B1D. High-voltage operation is usually limited.

Likely causes

Voltage sense lead C or its fuse open
Sense connector loose or corroded
Measurement input of the battery controller defective

Symptoms

  • MIL and hybrid/EV system warning on
  • Battery power limited, reduced electric drive or assist
  • Vehicle may not reach Ready or may shut down the high-voltage system

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 cwiring harnessbms

Related codes

P0B1AP0B1BP0B1CP0B1DP0B14P0B1E

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