Powertrain, generic · Hybrid propulsion

P0B67 Hybrid/EV Battery Voltage Sense I Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

SAE J2012 reserves P0B67 for an unsteady signal on channel I, meaning readings that spike, drop and recover. No manufacturer documents this code publicly, and none of the GM tables that define the other four channel I codes includes an erratic test. The fault picture would sit between an open circuit (P0B63) and a frozen value (P0B64): the line works most of the time but loses contact under vibration, heat or current load. CARB requires battery voltage sensors to be monitored as inputs of the energy storage system, which explains why the code exists at all. For diagnosis, record cell voltage I with a scan tool during a drive and compare its noise with neighbouring channels H and J.

Likely causes

Sense contact on channel I opening under vibration or heat
Corroded terminal in the module connector

Symptoms

  • Sporadic warning without a reproducible pattern
  • Momentary drop in electric power

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–5,000
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery voltage sense iwiring harnessbms

Related codes

P0B63P0B64P0B65P0B66P0B62P0B6C

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