P0B41 code meaning
Hybrid/EV Battery Voltage Sense B Circuit Range/Performance
Powertrain system Generic code P0Bxx codes Check engine light
What P0B41 means
P0B41 reports that cell voltage channel B gives values inside the normal range that fail a plausibility check against the other cells. In GM's 2019 tables Hybrid Powertrain Control Processor 2 compares sample-to-sample changes: if the average cell voltage trends by at least 0.005 V while channel B stays unchanged, a failure is counted, and 35 of 40 samples at 100 ms set the code, Type A, one trip, with system voltage above 10.2 V. FCA calls it Voltage Sense 2 Circuit Performance on the Pacifica plug-in hybrid and lists it with P0B3C and further channels in battery pack control module update bulletins. Circuit, low, high and erratic faults of channel B are P0B40, P0B42, P0B43 and P0B44.
P0B41 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 P0B41
- MIL on, often with several voltage sense codes
- Electric drive reduced or unavailable
- Contactor related codes stored at the same time
Common causes of P0B41
- Most likelyBattery controller software, fixed by reprogramming (FCA Pacifica)
- PossibleCell voltage measurement channel frozen inside the monitoring electronics
- PossibleHigh resistance in the cell sense line or its connection
- Less likelyCell monitoring board failure inside the pack
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 bWiring harnessBms
What each part of P0B41 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. |
| 41 | The exact fault in that area. |
What to do next
- Note P0B41 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 P0B41
What does P0B41 mean?
P0B41 means "Hybrid/EV Battery Voltage Sense B Circuit Range/Performance". P0B41 reports that cell voltage channel B gives values inside the normal range that fail a plausibility check against the other cells. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B41?
Drive gently and only to a workshop. With P0B41 the car can go into limp mode (reduced power) to protect itself.
Will P0B41 fail an emissions test?
Yes, it can. P0B41 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 P0B41 to fix?
Difficulty: workshop only. A typical repair takes 0.2 to 8 hours of work. This is a job for a workshop.
Will P0B41 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.