P0BB8Hybrid/EV Battery Voltage Sense Z Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL and stop or service warning for the drive system
- Ready mode may be refused
- No charging
- Likely causes
- LikelySense lead Z interrupted
- PossibleExcessive resistance at the splice or busbar of Z
- RareMonitoring electronics input Z defective
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €7,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.