P0B93 code meaning
Hybrid/EV Battery Voltage Sense R Circuit High
Powertrain system Generic code P0Bxx codes Check engine light
What P0B93 means
A reading on sense R above anything a healthy cell could produce sets P0B93. GM's lithium-ion battery controllers of 2016 and 2019 use 4.8 V or more, held 1.4 s within 2 s, as a Type A fault. The 16OBDG02 programme with its own battery sensor module draws the line at 4.90 V, 14 of 18 samples. GM's eAssist mild hybrid already reacts above 4.65 V (7 of 10 samples, Type B). On the 2012 two-mode trucks the channel is nickel-metal hydride block 18, which must exceed 23 V in 15 of 20 samples, Type B. Because a cell this high would be dangerous, an electrical fault is far more likely: a sense lead touching a higher potential, or a damaged measuring input on the monitoring board.
P0B93 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B93
- MIL and hybrid system warning
- Charging or regeneration cut back
- Reduced power mode
Common causes of P0B93
- Most likelySense lead R in contact with a higher cell potential
- PossibleDamaged measuring input for channel R
- Less likelyCell on channel R actually overcharged
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 rWiring harnessBms
What each part of P0B93 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. |
| 93 | The exact fault in that area. |
What to do next
- Note P0B93 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 P0B93
What does P0B93 mean?
P0B93 means "Hybrid/EV Battery Voltage Sense R Circuit High". A reading on sense R above anything a healthy cell could produce sets P0B93. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B93?
Drive gently and only to a workshop. With P0B93 the car can go into limp mode (reduced power) to protect itself.
Will P0B93 fail an emissions test?
Yes, it can. P0B93 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 P0B93 to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0B93 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.