P0B15Hybrid/EV Battery Pack 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
- P0B15 marks pack voltage measurement B as electrically valid but implausible: the value lies within the sensor range yet does not match a reference, typically the sum of the cell voltages or another pack measurement. No manufacturer documents this code publicly. GM shows the principle on channel A: P0ABB fails when pack voltage and summed cell voltages differ by more than 12 V, 20 of 25 samples at 25 ms, Type A, one trip. CARB demands rationality checks for battery voltage sensors of the hybrid storage system. Hard circuit faults of channel B are P0B14, P0B16 and P0B17. Because state of charge and cell protection rely on this value, the controller restricts power or charging.
- What you may notice
- MIL and hybrid/EV system warning on
- Battery power limited, reduced electric drive or assist
- Implausible state-of-charge or range display
- Likely causes
- LikelyDrift or calibration error of measurement channel B
- PossibleFaulty cell voltage acquisition distorts the reference sum
- PossibleIncreased contact 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.