P0B1FHybrid/EV Battery Pack Voltage Sense D 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
- P0B1F says pack voltage measurement D is electrically present but disagrees with what the controller expects, typically the sum of cell voltages or a parallel pack measurement. It is a plausibility fault, not an open or shorted circuit. No manufacturer documents P0B1F publicly. GM's analogous channel A check, P0ABB, fails at a deviation above 12 V from the summed cell voltages for 20 of 25 samples at 25 ms, Type A, one trip. CARB requires rationality checks for battery voltage sensors of hybrid storage systems. Circuit faults of channel D use P0B1E, P0B20 and P0B21. With a doubtful pack voltage the controller narrows the usable battery window and limits power.
- What you may notice
- MIL and hybrid/EV system warning on
- Implausible state-of-charge or range display
- Battery power limited, reduced electric drive or assist
- Likely causes
- LikelyDrift or calibration error of measurement channel D
- PossibleCell voltage acquisition faulty, reference sum wrong
- PossibleIncreased resistance at sense terminals
- RareBattery controller software needs an update
- 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: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.