Powertrain, generic · Hybrid propulsion

P0BB8 Hybrid/EV Battery Voltage Sense Z Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0BB8 is the open-circuit code of channel Z, the twenty-sixth and last cell channel with a generic P0 code. GM packs with more channels continue with manufacturer codes, for example P1B28 for the circuit of AA in the 2019 tables. The 2019 battery energy control module sets P0BB8 through the same seven cases as its neighbours, with 1.3 V between adjacent cells, under 36 mV on an active balancing gate or excessive splice voltage, 0.8 s in 1.6 s, Type A. GM's eAssist uses the voltage of lines N and N-1 below 1.4 V together with a change above 0.5 V in 200 ms, seven of ten samples, Type B and gated by P1B38. The 2011 Volt already listed P0BB8 among its open sense line faults.

Likely causes

Sense lead Z interrupted
Excessive resistance at the splice or busbar of Z
Monitoring electronics input Z defective

Symptoms

  • MIL and stop or service warning for the drive system
  • Ready mode may be refused
  • No charging

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–7,000
Time1–10 h

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

Parts involved

hv battery voltage sense zwiring harnessbms

Related codes

P0BB9P0BBAP0BBBP0BBCP0BB3P0ABA

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.