Powertrain, generic · Hybrid propulsion

P0B14 Hybrid/EV Battery Pack Voltage Sense B Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

SAE J2012 reserves up to four pack voltage measurements, A to D; voltage sense B is the second one. P0B14 is its general circuit code: the battery controller sees an electrical fault on this input, typically an open or implausible raw signal. Which tap a manufacturer calls B is not standardised. No manufacturer documents P0B14 publicly. For the comparable channel A GM checks pack-side voltage against fixed limits and against the sum of cell voltages (P0ABB to P0ABD). CARB requires battery voltage sensors of hybrid storage systems to be monitored like any input component. Range, low, high and erratic faults have their own codes, P0B15 to P0B18. The system usually limits or blocks high-voltage operation.

Likely causes

Voltage sense lead or its fuse open inside the pack
Sense connector at the battery controller 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 bwiring harnessbms

Related codes

P0B15P0B16P0B17P0B18P0ABAP0B19

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