P0B46 code meaning
Hybrid/EV Battery Voltage Sense C Circuit Range/Performance
Powertrain system Generic code P0Bxx codes Check engine light
What P0B46 means
With P0B46 the channel C wiring is intact; the value on it looks plausible but no longer behaves like a real cell. GM's 2019 tables run the test in Hybrid Powertrain Control Processor 2: whenever the average cell voltage trends by at least 0.005 V in one direction, channel C has to follow; if it stays frozen in 35 of 40 samples at 100 ms, the code sets, Type A. The 2016 Chevrolet Volt uses a window of 7 out of 8 seconds instead. Chrysler calls the code Voltage Sense 3 Circuit Performance on the 2020 Pacifica plug-in hybrid and cures it by reflashing the battery pack control module. So before opening the battery, check the controller software level.
P0B46 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.2 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B46
- MIL on without noticeable driving fault
- Reduced electric power or hybrid assist
- Contactor or precharge codes stored at the same time (Pacifica)
Common causes of P0B46
- Most likelyBattery controller software misjudging the channel, fixed by reflash (Chrysler Pacifica PHEV)
- PossibleMeasuring chip input for channel C stuck at a constant value
- Less likelyHigh-resistance cell tap damping the channel C 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 cWiring harnessBms
What each part of P0B46 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. |
| 46 | The exact fault in that area. |
What to do next
- Note P0B46 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 P0B46
What does P0B46 mean?
P0B46 means "Hybrid/EV Battery Voltage Sense C Circuit Range/Performance". With P0B46 the channel C wiring is intact; the value on it looks plausible but no longer behaves like a real cell. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B46?
Drive gently and only to a workshop. With P0B46 the car can go into limp mode (reduced power) to protect itself.
Will P0B46 fail an emissions test?
Yes, it can. P0B46 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 P0B46 to fix?
Difficulty: workshop only. A typical repair takes 0.2 to 8 hours of work. This is a job for a workshop.
Will P0B46 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.