P0B7C code meaning
Hybrid/EV Battery Voltage Sense N Circuit
Powertrain system Generic code P0Bxx codes Check engine light
What P0B7C means
Voltage sense N, the fourteenth channel, reports a broken or high-resistance sense lead with P0B7C. It is the last code in Ford's TSB 23-2039: 2019-2020 Fusion plug-in hybrids that fail to start with any open-circuit code from P0B3B up to P0B7C get a replacement traction battery; the bulletin names no channel beyond N. In GM's 2019 battery controller tables N is the first channel whose open test runs 0.8 s within a 1.6 s window instead of 0.6 s, while the criteria (1.3 V adjacent-cell difference, 36 mV balancing gate, splice limits) stay the same, Type A. A second GM program of 2016 closes the balancing gates in a test pattern, turns the voltage drop into a sense-line resistance and fails above 30.00 in 7 of 9 samples, Type A.
P0B7C at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B7C
- No start or vehicle does not become ready
- MIL and stop-safely or service message
- Plug-in charging unavailable
Common causes of P0B7C
- Most likelyInternal traction battery fault (Ford Fusion PHEV 2019-2020)
- PossibleSense lead N broken or with excessive resistance
- Less likelyFault on the cell monitoring board
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 P0B7C 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. |
| 7C | The exact fault in that area. |
What to do next
- Note P0B7C 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 P0B7C
What does P0B7C mean?
P0B7C means "Hybrid/EV Battery Voltage Sense N Circuit". Voltage sense N, the fourteenth channel, reports a broken or high-resistance sense lead with P0B7C. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B7C?
Drive gently and only to a workshop. With P0B7C the car can go into limp mode (reduced power) to protect itself.
Will P0B7C fail an emissions test?
Yes, it can. P0B7C 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 P0B7C to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P0B7C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.