P0B55 code meaning
Hybrid/EV Battery Voltage Sense F Circuit Range/Performance
Powertrain system Generic code P0Bxx codes Check engine light
What P0B55 means
P0B55 is the plausibility code of cell channel F: the signal exists and lies inside its range, yet it does not move like the rest of the pack. On the 2016 Chevrolet Volt the vehicle integration control module checks whether channel F moves in the same direction as the average cell voltage, failing it after 7 seconds in an 8 second window, Type A; GM's 2019 tables use 35 failures in 40 samples of 100 ms. The 2012 two-mode hybrids compare block 6, times 20, with the pack voltage and allow 70 V. Chrysler labels it Voltage Sense 6 Circuit Performance on the 2020 Pacifica PHEV, the highest channel in that bulletin, and resolves it with BPCM software.
P0B55 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.2 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B55
- MIL with otherwise normal driving
- Reduced hybrid or electric performance
Common causes of P0B55
- PossibleBattery controller software, fixed by update (Chrysler Pacifica PHEV)
- PossibleChannel F measuring input stuck or slow to respond
- Less likelyIncreased resistance in the channel F tap or connector
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 fWiring harnessBms
What each part of P0B55 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. |
| 55 | The exact fault in that area. |
What to do next
- Note P0B55 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 P0B55
What does P0B55 mean?
P0B55 means "Hybrid/EV Battery Voltage Sense F Circuit Range/Performance". P0B55 is the plausibility code of cell channel F: the signal exists and lies inside its range, yet it does not move like the rest of the pack. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B55?
Drive gently and only to a workshop. With P0B55 the car can go into limp mode (reduced power) to protect itself.
Will P0B55 fail an emissions test?
Yes, it can. P0B55 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 P0B55 to fix?
Difficulty: workshop only. A typical repair takes 0.2 to 8 hours of work. This is a job for a workshop.
Will P0B55 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.