P0B7F code meaning
Hybrid/EV Battery Voltage Sense N Circuit High
Powertrain system Generic code P0Bxx codes Check engine light
What P0B7F means
Channel N reporting more voltage than a cell can hold leads to P0B7F. GM uses three thresholds depending on the system: 4.8 V or more for 1.4 s in 2 s on most lithium-ion battery controllers, above 4.90 V in 14 of 18 samples on the 2016 program with a separate sense module, both Type A, and above 4.65 V in 7 of 10 samples on the BAS Plus mild hybrid, Type B. The 2012 two-mode trucks treat N as NiMH block 14 and set the code above 23 V in 15 of 20 samples, Type B. The low counterpart is P0B7E, an open lead is P0B7C. Before suspecting the cell, a technician checks whether the N lead touches a neighbouring higher potential or whether the measuring input has drifted.
P0B7F 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 P0B7F
- MIL and warning in the instrument cluster
- Regenerative braking and charging limited
Common causes of P0B7F
- Most likelySense lead N touching a higher potential
- PossibleDrifted measuring input in the battery controller
- Less likelyReal overvoltage of the 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 P0B7F 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. |
| 7F | The exact fault in that area. |
What to do next
- Note P0B7F 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 P0B7F
What does P0B7F mean?
P0B7F means "Hybrid/EV Battery Voltage Sense N Circuit High". Channel N reporting more voltage than a cell can hold leads to P0B7F. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B7F?
Drive gently and only to a workshop. With P0B7F the car can go into limp mode (reduced power) to protect itself.
Will P0B7F fail an emissions test?
Yes, it can. P0B7F 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 P0B7F to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0B7F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.