P0B4EHybrid/EV Battery Voltage Sense D Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B4E completes the five-code set of cell channel D. Where P0B4A means a lasting open circuit, P0B4B a frozen or implausible value and P0B4C or P0B4D a reading beyond fixed limits, this code is meant for short, irregular dropouts and spikes. No manufacturer documents P0B4E publicly, and GM's published hybrid tables, which cover the other four, contain no such test. CARB obliges manufacturers to monitor the storage system's voltage sensors as input components. In practice, intermittent sense faults trace back to vibration, thermal cycling and connectors that only lose contact on rough roads, which is why the fault often cannot be reproduced in the workshop.
- What you may notice
- Intermittent hybrid warning, often on rough roads
- Fault not reproducible during workshop test
- Likely causes
- LikelyConnector or tap losing contact under vibration
- PossibleSolder joint or crimp cracked by thermal cycling
- 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: €80 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.