P0B19 code meaning
Hybrid/EV Battery Pack Voltage Sense C Circuit
Powertrain system Generic code P0Bxx codes Check engine light
What P0B19 means
Voltage sense C is the third of up to four pack voltage measurements defined in SAE J2012. P0B19 is its general circuit code and sets when the battery controller finds this input electrically unusable, for instance open or without a valid raw value. Which measuring point a manufacturer assigns to C is its own choice. No manufacturer documents P0B19 publicly. GM shows the principle for channel A, checking pack-side voltage against limits and against the summed cell voltages (P0ABB to P0ABD). CARB requires battery voltage sensors of hybrid storage systems to be monitored as input components. The detailed fault types of channel C are P0B1A to P0B1D. High-voltage operation is usually limited.
P0B19 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 P0B19
- MIL and hybrid/EV system warning on
- Battery power limited, reduced electric drive or assist
- Vehicle may not reach Ready or may shut down the high-voltage system
Common causes of P0B19
- Most likelyVoltage sense lead C or its fuse open
- PossibleSense connector loose or corroded
- PossibleMeasurement input of the battery controller defective
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 cWiring harnessBms
What each part of P0B19 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. |
| 19 | The exact fault in that area. |
What to do next
- Note P0B19 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 P0B19
What does P0B19 mean?
P0B19 means "Hybrid/EV Battery Pack Voltage Sense C Circuit". Voltage sense C is the third of up to four pack voltage measurements defined in SAE J2012. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B19?
Drive gently and only to a workshop. With P0B19 the car can go into limp mode (reduced power) to protect itself.
Will P0B19 fail an emissions test?
Yes, it can. P0B19 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 P0B19 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0B19 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.