P0B41Hybrid/EV Battery Voltage Sense B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL on, often with several voltage sense codes
- Electric drive reduced or unavailable
- Contactor related codes stored at the same time
- Likely causes
- 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
- RareCell monitoring board failure inside the pack
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.