P0B1DHybrid/EV Battery Pack Voltage Sense C Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0B1D stands for an unsteady pack voltage measurement C: the signal jumps, drops out for moments or changes faster than a real battery voltage can. Because the fault often clears itself, it is frequently found only as a stored code. No manufacturer documents P0B1D publicly; GM's published tables cover only channel A of this measurement (P0ABB to P0ABD). CARB requires circuit monitoring of battery voltage sensors in hybrid storage systems. Permanent faults of channel C are P0B19 to P0B1C, the same fault type on channels B and D is P0B18 and P0B22. Loose terminals, vibration and temperature changes are the usual suspects, so warnings tend to come and go.
- What you may notice
- Warning comes and goes, often stored as history
- Battery power limited, reduced electric drive or assist
- Vehicle may not reach Ready or may shut down the high-voltage system
- Likely causes
- LikelyLoose or corroded sense connector or terminal
- PossibleChafed sense lead with intermittent contact
- RareController software misinterprets transients
- 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.