P0B57 code meaning
Hybrid/EV Battery Voltage Sense F Circuit High
Powertrain system Generic code P0Bxx codes Check engine light
What P0B57 means
P0B57 stands for an implausibly high value on cell sense channel F, as opposed to P0B56 for an implausibly low one and P0B55 for a frozen value. GM uses fixed upper limits: 4.8 V or more for 1.4 s within 2 s in the battery energy control module of its lithium-ion systems (Type A, one trip), and above 23 V for block 6 in the 2012 two-mode trucks (15 of 20 samples, Type B, two trips). Both values lie clearly above what the cell or block can physically reach, so a real overcharge is not the explanation. Look for a sense lead in contact with a higher potential or for a measuring fault inside the module, and expect limited battery power and charging until then.
P0B57 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.3 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B57
- MIL and battery warning
- Battery charging limited
- Weaker acceleration in hybrid mode
Common causes of P0B57
- Most likelyChannel F sense lead touching a higher potential
- PossibleMeasuring input or reference fault in the module
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 P0B57 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. |
| 57 | The exact fault in that area. |
What to do next
- Note P0B57 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 P0B57
What does P0B57 mean?
P0B57 means "Hybrid/EV Battery Voltage Sense F Circuit High". P0B57 stands for an implausibly high value on cell sense channel F, as opposed to P0B56 for an implausibly low one and P0B55 for a frozen value. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B57?
Drive gently and only to a workshop. With P0B57 the car can go into limp mode (reduced power) to protect itself.
Will P0B57 fail an emissions test?
Yes, it can. P0B57 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 P0B57 to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 6 hours of work. This is a job for a workshop.
Will P0B57 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.