Powertrain, generic · Hybrid propulsion

P0BBC Hybrid/EV Battery Voltage Sense Z Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0BBC closes the generic block of 26 cell voltage channels from A to Z; after it J2012 moves on to pack-level codes such as P0BBD and P0BBE. The code is meant for a Z signal that is unstable rather than absent. There is no manufacturer documentation for it: GM monitors channel Z from the 2011 Volt to the 2019 battery energy control module, but always with P0BB8 to P0BBB only, and no table contains an intermittent monitor. Its basis is CARB 1968.2, which requires battery voltage sensors of hybrid storage systems to be checked and faults to be narrowed down to the smallest replaceable unit. Should it appear, contacts that fail under vibration or heat cycling are the logical starting point.

Likely causes

Intermittent contact on sense lead Z
Joint at channel Z opening with heat cycling
Corrosion in the Z sense connector

Symptoms

  • Warning lamp appearing irregularly
  • Occasional brief loss of electric drive 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 zwiring harnessbms

Related codes

P0BB8P0BB9P0BBAP0BBBP0BB7P0ABE

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