Powertrain, generic · Hybrid propulsion

P0B1C Hybrid/EV Battery Pack Voltage Sense C Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B1C reports that pack voltage measurement C reads above its plausible upper limit. Usually the measurement path is at fault, for example a sense lead shorted to a higher potential, a defective controller input or a software error in the evaluation, rather than a real overvoltage of the pack. No manufacturer documents P0B1C publicly. GM checks channel A against a 479 V limit on its BECM (P0ABD, Type A, 1.6 s in 2 s), and Mercedes-Benz logs the matching channel B fault P0B17 on the eSprinter. CARB requires out-of-range monitoring of battery voltage sensors. The low counterpart is P0B1B. The controller typically blocks or limits high-voltage operation.

Likely causes

Sense lead of channel C shorted to a higher potential
Evaluation error in battery controller software
Measurement input of the battery controller defective

Symptoms

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

P0B19P0B1AP0B1BP0B1DP0B17P0ABD

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