Powertrain, generic · Hybrid propulsion

P0BB2 Hybrid/EV Battery Voltage Sense X Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Of the five X codes, P0BB2 is the only one without any public manufacturer description. It is intended for a sense X signal that flickers, drops out briefly or jumps between values. GM's Volt tables of 2011 and 2016 list channel X with circuit, range, low and high monitors, P0BAE to P0BB1, and no intermittent check. The code therefore rests on the J2012 structure and on CARB 1968.2, which requires hybrid battery voltage sensors to be monitored and the fault to be isolated to the smallest replaceable unit. In practice a technician would look for a contact that opens under vibration, moisture in a connector or a harness rubbing against the module housing.

Likely causes

Contact on lead X opening under vibration
Moisture or corrosion in the X sense connector
Harness X chafing against the module housing

Symptoms

  • Intermittent warning lamp
  • Sporadic hybrid system message

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 xwiring harnessbms

Related codes

P0BAEP0BAFP0BB0P0BB1P0BADP0BB7

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