Powertrain, generic · Hybrid propulsion

P0B1D Hybrid/EV Battery Pack Voltage Sense C Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0B1D stands for an unsteady pack voltage measurement C: the signal jumps, drops out for moments or changes faster than a real battery voltage can. Because the fault often clears itself, it is frequently found only as a stored code. No manufacturer documents P0B1D publicly; GM's published tables cover only channel A of this measurement (P0ABB to P0ABD). CARB requires circuit monitoring of battery voltage sensors in hybrid storage systems. Permanent faults of channel C are P0B19 to P0B1C, the same fault type on channels B and D is P0B18 and P0B22. Loose terminals, vibration and temperature changes are the usual suspects, so warnings tend to come and go.

Likely causes

Loose or corroded sense connector or terminal
Chafed sense lead with intermittent contact
Controller software misinterprets transients

Symptoms

  • Warning comes and goes, often stored as history
  • 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

P0B19P0B1AP0B1BP0B1CP0B18P0B22

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