P0B6D code meaning
Hybrid/EV Battery Voltage Sense K Circuit
Powertrain system Generic code P0Bxx codes Check engine light
What P0B6D means
P0B6D marks an open circuit on voltage sense K, the eleventh cell measuring channel. GM has used the code since its first published hybrid tables: in 2011 the open-line test already checked bus bar voltages, flagging more than 0.7 V. The 2019 battery energy control module refines it into seven cases, among them adjacent cells 1.3 V apart, a cell under 36 mV with balancing active and splice voltages over 0.1 V, all judged in a 0.6 s window and set as Type A. Ford counts P0B6D among the open sense line codes that leave a 2019-2020 Fusion plug-in hybrid unable to start and fixes it by replacing the traction battery. Before any pack work, the high-voltage system has to be disabled by trained staff.
P0B6D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B6D
- Vehicle not ready to drive
- Hybrid or EV system warning with MIL
- Charging not possible
Common causes of P0B6D
- Most likelyLoose or corroded bus bar connection at the channel K tap
- PossibleInternal traction battery fault, pack replacement (Ford Fusion PHEV)
- PossibleBroken sense wire between cells and 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 kWiring harnessBms
What each part of P0B6D 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. |
| 6D | The exact fault in that area. |
What to do next
- Note P0B6D 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 P0B6D
What does P0B6D mean?
P0B6D means "Hybrid/EV Battery Voltage Sense K Circuit". P0B6D marks an open circuit on voltage sense K, the eleventh cell measuring channel. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B6D?
Drive gently and only to a workshop. With P0B6D the car can go into limp mode (reduced power) to protect itself.
Will P0B6D fail an emissions test?
Yes, it can. P0B6D 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 P0B6D to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 8 hours of work. This is a job for a workshop.
Will P0B6D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.