P0B1BHybrid/EV Battery Pack Voltage Sense C 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
- P0B1B sets when pack voltage measurement C delivers a reading below its plausible lower limit. Typical electrical causes are a sense lead shorted to ground, an open fuse or resistor in the sense path, or a defective controller input. No manufacturer documents this code publicly. GM applies the same idea to channel A, where P0ABC sets below 24 V pack-side voltage for 1.6 s in a 2 s window, Type A. CARB calls for out-of-range monitoring of battery voltage sensors. The high counterpart is P0B1C and the plausibility code P0B1A. A pack voltage reading that is too low can prevent precharge and contactor closing, so the vehicle may not become ready to drive.
- What you may notice
- Vehicle may not reach Ready or may shut down the high-voltage system
- MIL and hybrid/EV system warning on
- Battery power limited, reduced electric drive or assist
- Likely causes
- LikelySense lead of channel C 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.