P0B1CHybrid/EV Battery Pack Voltage Sense C Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B1C reports that pack voltage measurement C reads above its plausible upper limit. Usually the measurement path is at fault, for example a sense lead shorted to a higher potential, a defective controller input or a software error in the evaluation, rather than a real overvoltage of the pack. No manufacturer documents P0B1C publicly. GM checks channel A against a 479 V limit on its BECM (P0ABD, Type A, 1.6 s in 2 s), and Mercedes-Benz logs the matching channel B fault P0B17 on the eSprinter. CARB requires out-of-range monitoring of battery voltage sensors. The low counterpart is P0B1B. The controller typically blocks or limits high-voltage 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 C shorted to a higher potential
- PossibleEvaluation error in battery controller software
- 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.