P0B68 code meaning
Hybrid/EV Battery Voltage Sense J Circuit
Powertrain system Generic code P0Bxx codes Check engine light
What P0B68 means
For owners of a 2019 or 2020 Ford Fusion plug-in hybrid, P0B68 is best known from bulletin 23-2039: the car will not start, the battery energy control module stores one or more open sense line codes from P0B3B to P0B7C, and the prescribed repair is a complete high-voltage traction battery. Technically the code says that the tenth measuring channel, J, has lost its connection to the cells. GM describes the test in detail for its lithium-ion packs: within 0.6 s it looks for adjacent cells 1.3 V apart, a cell under 36 mV while being balanced, or splice voltages above 0.1 V or 0.5 V, and sets P0B68 as Type A. GM's BAS Plus mild hybrid uses a 1.4 V and 0.5 V rate-of-change test, Type B.
P0B68 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 P0B68
- No start, vehicle does not become ready
- Hybrid system warning on the cluster
- Plug-in charging unavailable
Common causes of P0B68
- Most likelyInternal traction battery failure, pack replacement (Ford Fusion PHEV 2019-2020)
- PossibleOpen sense wire or cell tap on channel J
- Less likelyBad bus bar or splice connection near channel J
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 jWiring harnessBms
What each part of P0B68 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. |
| 68 | The exact fault in that area. |
What to do next
- Note P0B68 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 P0B68
What does P0B68 mean?
P0B68 means "Hybrid/EV Battery Voltage Sense J Circuit". For owners of a 2019 or 2020 Ford Fusion plug-in hybrid, P0B68 is best known from bulletin 23-2039: the car will not start, the battery energy control module stores one or more open sense line codes from P0B3B to P0B7C, and the prescribed repair is a complete high-voltage traction battery. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B68?
Drive gently and only to a workshop. With P0B68 the car can go into limp mode (reduced power) to protect itself.
Will P0B68 fail an emissions test?
Yes, it can. P0B68 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 P0B68 to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0B68 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.