P0B15 code meaning
Hybrid/EV Battery Pack Voltage Sense B Circuit Range/Performance
Powertrain system Generic code P0Bxx codes Check engine light
What P0B15 means
P0B15 marks pack voltage measurement B as electrically valid but implausible: the value lies within the sensor range yet does not match a reference, typically the sum of the cell voltages or another pack measurement. No manufacturer documents this code publicly. GM shows the principle on channel A: P0ABB fails when pack voltage and summed cell voltages differ by more than 12 V, 20 of 25 samples at 25 ms, Type A, one trip. CARB demands rationality checks for battery voltage sensors of the hybrid storage system. Hard circuit faults of channel B are P0B14, P0B16 and P0B17. Because state of charge and cell protection rely on this value, the controller restricts power or charging.
P0B15 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 P0B15
- MIL and hybrid/EV system warning on
- Battery power limited, reduced electric drive or assist
- Implausible state-of-charge or range display
Common causes of P0B15
- Most likelyDrift or calibration error of measurement channel B
- PossibleFaulty cell voltage acquisition distorts the reference sum
- PossibleIncreased contact 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 bWiring harnessBms
What each part of P0B15 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. |
| 15 | The exact fault in that area. |
What to do next
- Note P0B15 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 P0B15
What does P0B15 mean?
P0B15 means "Hybrid/EV Battery Pack Voltage Sense B Circuit Range/Performance". P0B15 marks pack voltage measurement B as electrically valid but implausible: the value lies within the sensor range yet does not match a reference, typically the sum of the cell voltages or another pack measurement. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B15?
Drive gently and only to a workshop. With P0B15 the car can go into limp mode (reduced power) to protect itself.
Will P0B15 fail an emissions test?
Yes, it can. P0B15 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 P0B15 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0B15 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.