P0B95 code meaning
Hybrid/EV Battery Voltage Sense S Circuit
Powertrain system Generic code P0Bxx codes Check engine light
What P0B95 means
P0B95 reports that the sense S lead, channel nineteen, no longer connects its cell reliably to the monitoring electronics. GM programmes with a separate battery sensor module (16OBDG02) measure this directly: after each normal reading the balancing gates switch in a test pattern, current flows through the sense wires and the voltage drop is turned into a line resistance. Above 30.00 (the table gives no unit) in 7 of 9 samples at 100 ms, the code sets as Type A. GM's eAssist mild hybrid instead needs lines N and N-1 both under 1.4 V plus a jump of more than 0.5 V in 200 ms, 7 of 10 samples, Type B, and stays quiet while P1B37 is active. The 2019 lithium-ion controller uses its seven cases with 0.8 s in 1.6 s.
P0B95 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B95
- MIL and hybrid or EV warning
- Vehicle may refuse ready mode
- Cell balancing no longer effective
Common causes of P0B95
- Most likelyHigh resistance in sense lead S from corrosion or a loose terminal
- PossibleSense lead S broken at the cell connector
- Less likelyDefective input of the battery sensor module for channel S
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 sWiring harnessBms
What each part of P0B95 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. |
| 95 | The exact fault in that area. |
What to do next
- Note P0B95 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 P0B95
What does P0B95 mean?
P0B95 means "Hybrid/EV Battery Voltage Sense S Circuit". P0B95 reports that the sense S lead, channel nineteen, no longer connects its cell reliably to the monitoring electronics. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B95?
Drive gently and only to a workshop. With P0B95 the car can go into limp mode (reduced power) to protect itself.
Will P0B95 fail an emissions test?
Yes, it can. P0B95 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 P0B95 to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P0B95 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.