P0B1F code meaning
Hybrid/EV Battery Pack Voltage Sense D Circuit Range/Performance
Powertrain system Generic code P0Bxx codes Check engine light
What P0B1F means
P0B1F says pack voltage measurement D is electrically present but disagrees with what the controller expects, typically the sum of cell voltages or a parallel pack measurement. It is a plausibility fault, not an open or shorted circuit. No manufacturer documents P0B1F publicly. GM's analogous channel A check, P0ABB, fails at a deviation above 12 V from the summed cell voltages for 20 of 25 samples at 25 ms, Type A, one trip. CARB requires rationality checks for battery voltage sensors of hybrid storage systems. Circuit faults of channel D use P0B1E, P0B20 and P0B21. With a doubtful pack voltage the controller narrows the usable battery window and limits power.
P0B1F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B1F
- MIL and hybrid/EV system warning on
- Implausible state-of-charge or range display
- Battery power limited, reduced electric drive or assist
Common causes of P0B1F
- Most likelyDrift or calibration error of measurement channel D
- PossibleCell voltage acquisition faulty, reference sum wrong
- PossibleIncreased resistance at sense terminals
- Less likelyBattery controller software needs an update
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery pack voltage sense dWiring harnessBms
What each part of P0B1F 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. |
| 1F | The exact fault in that area. |
What to do next
- Note P0B1F 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 P0B1F
What does P0B1F mean?
P0B1F means "Hybrid/EV Battery Pack Voltage Sense D Circuit Range/Performance". P0B1F says pack voltage measurement D is electrically present but disagrees with what the controller expects, typically the sum of cell voltages or a parallel pack measurement. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B1F?
Drive gently and only to a workshop. With P0B1F the car can go into limp mode (reduced power) to protect itself.
Will P0B1F fail an emissions test?
Yes, it can. P0B1F 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 P0B1F to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0B1F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.