P0B16Hybrid/EV Battery Pack Voltage Sense B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B16 sets when pack voltage measurement B reports a value below its plausible minimum, usually an electrical cause such as a sense lead shorted to ground or an open input that pulls the reading down. No manufacturer documents this code publicly. GM uses the same logic on channel A: on its BECM P0ABC sets when the pack-side voltage drops below 24 V for 1.6 s within a 2 s window, Type A, one trip. CARB requires out-of-range monitoring of battery voltage sensors in hybrid storage systems. The opposite fault is P0B17, implausible but in-range values are P0B15. Without a trustworthy pack voltage the controller may refuse to close the contactors or limit operation.
- What you may notice
- MIL and hybrid/EV system warning on
- Vehicle may not reach Ready or may shut down the high-voltage system
- Battery power limited, reduced electric drive or assist
- Likely causes
- LikelySense lead of channel B shorted to ground
- PossibleFuse or resistor in the sense path open
- PossibleMeasurement input of the battery controller defective
- 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.