Powertrain, generic · Hybrid propulsion

P0B1B Hybrid/EV Battery Pack Voltage Sense C Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B1B sets when pack voltage measurement C delivers a reading below its plausible lower limit. Typical electrical causes are a sense lead shorted to ground, an open fuse or resistor in the sense path, or a defective controller input. No manufacturer documents this code publicly. GM applies the same idea to channel A, where P0ABC sets below 24 V pack-side voltage for 1.6 s in a 2 s window, Type A. CARB calls for out-of-range monitoring of battery voltage sensors. The high counterpart is P0B1C and the plausibility code P0B1A. A pack voltage reading that is too low can prevent precharge and contactor closing, so the vehicle may not become ready to drive.

Likely causes

Sense lead of channel C shorted to ground
Fuse or resistor in the sense path open
Measurement input of the battery controller defective

Symptoms

  • Vehicle may not reach Ready or may shut down the high-voltage system
  • MIL and hybrid/EV system warning on
  • 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 cwiring harnessbms

Related codes

P0B19P0B1AP0B1CP0B1DP0B16P0ABC

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