P0B7EHybrid/EV Battery Voltage Sense N Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B7E sets when channel N reads below the lower plausibility limit. GM's 2016 program with a separate battery sense module uses less than 0.20 V and needs 14 failures in 18 samples, about 1.8 s at 100 ms each, before a Type A fault; the open-circuit test must not be failing at the same time. The other GM lithium-ion controllers use 0.2 V or less for 1.4 s in 2 s, also Type A. The BAS Plus mild hybrid works with 1.4 V and 7 of 10 samples, Type B. On 2012 two-mode trucks N is NiMH block 14, and blocks 14 and 15 must both drop under 2 V. A low reading usually comes from the measuring path, not from the cell: a lead shorted to a lower potential or a damaged input stage.
- What you may notice
- MIL from the first trip on lithium-ion GM systems
- Hybrid system limits power
- Combustion engine does not shut off at standstill
- Likely causes
- LikelySense lead N shorted to a lower potential
- PossibleDamaged input stage in the sense module
- RareDeeply discharged or failed cell on channel N
- 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: €100 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.