P0B7E code meaning
Hybrid/EV Battery Voltage Sense N Circuit Low
Powertrain system Generic code P0Bxx codes Check engine light
What P0B7E means
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.
P0B7E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B7E
- MIL from the first trip on lithium-ion GM systems
- Hybrid system limits power
- Combustion engine does not shut off at standstill
Common causes of P0B7E
- Most likelySense lead N shorted to a lower potential
- PossibleDamaged input stage in the sense module
- Less likelyDeeply discharged or failed cell on channel N
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery voltage sense nWiring harnessBms
What each part of P0B7E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B | Area: hybrid propulsion. |
| 7E | The exact fault in that area. |
What to do next
- Note P0B7E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0B7E
What does P0B7E mean?
P0B7E means "Hybrid/EV Battery Voltage Sense N Circuit Low". P0B7E sets when channel N reads below the lower plausibility limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B7E?
Drive gently and only to a workshop. With P0B7E the car can go into limp mode (reduced power) to protect itself.
Will P0B7E fail an emissions test?
Yes, it can. P0B7E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0B7E to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0B7E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.