P0B64 code meaning
Hybrid/EV Battery Voltage Sense I Circuit Range/Performance
Powertrain system Generic code P0Bxx codes Check engine light
What P0B64 means
P0B64 is a rationality fault: channel I is connected and reads a believable number, yet it does not move with the other cells. GM's 2016 Chevrolet Volt compares the movement of each cell with the average; if channel I does not follow when the average moves by more than 0.022 V, 7 out of 8 seconds fail the check, Type A. The 2019 hybrid powertrain control processor 2 tables keep the idea but count samples, 35 failures out of 40 at 100 ms. On the 2012 two-mode trucks the same code belongs to nickel-metal hydride block 9, whose scaled value must stay within 70 V of the pack voltage. Because the input is alive but stuck or drifting, a software update or the monitoring board is a likelier fix than wiring.
P0B64 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.3 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B64
- MIL on, vehicle drives normally
- Reduced hybrid assist or electric range
Common causes of P0B64
- Most likelyChannel I measuring input frozen at a constant value
- PossibleBattery controller software misjudging the channel
- Less likelyHigh-resistance cell tap damping the signal
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 iWiring harnessBms
What each part of P0B64 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. |
| 64 | The exact fault in that area. |
What to do next
- Note P0B64 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 P0B64
What does P0B64 mean?
P0B64 means "Hybrid/EV Battery Voltage Sense I Circuit Range/Performance". P0B64 is a rationality fault: channel I is connected and reads a believable number, yet it does not move with the other cells. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B64?
Drive gently and only to a workshop. With P0B64 the car can go into limp mode (reduced power) to protect itself.
Will P0B64 fail an emissions test?
Yes, it can. P0B64 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 P0B64 to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 8 hours of work. This is a job for a workshop.
Will P0B64 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.