Powertrain, generic · Hybrid propulsion

P0B6C Hybrid/EV Battery Voltage Sense J Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

No manufacturer documents P0B6C publicly. The code stands for a channel J signal that is unstable, with brief jumps or dropouts, as opposed to the steady faults covered by P0B68 to P0B6B. CARB section 1968.2 requires that the individual electronic inputs of a hybrid energy storage system, battery voltage sensors expressly included, be monitored for circuit and rationality faults; erratic behaviour is one way such a fault can show. GM, which publishes tests for the other four channel J codes, lists none for this one. For the driver it would mean a warning that comes and goes, possibly with short power cuts. A cable or connector with marginal contact is the most plausible cause.

Likely causes

Marginal contact in the channel J harness or connector
Cracked solder joint on the monitoring electronics

Symptoms

  • Intermittent warning light
  • Brief power reductions while driving

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 jwiring harnessbms

Related codes

P0B68P0B69P0B6AP0B6BP0B67P0B71

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