P0B80Hybrid/EV Battery Voltage Sense N 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
- P0B80 describes an unsteady channel N signal: the voltage drops out or jumps for moments, then looks normal again. No manufacturer documents this code publicly. Ford's Fusion plug-in bulletin, which reaches exactly up to channel N, cites only the open-circuit code P0B7C, and GM's tables give channel N open, rationality, low and high diagnostics without a separate erratic test. Background is CARB 1968.2, under which battery voltage sensors in a hybrid energy storage system count as monitored components with their own fault codes. If a vehicle does store it, the trigger would be a contact that opens under vibration or temperature change, for example at the N tap, in the harness connector or at a board joint. Restarting may hide the fault for a while.
- What you may notice
- Intermittent hybrid warning
- Fault not present after restart
- Occasional loss of electric power
- Likely causes
- LikelyContact at the N tap opening under vibration
- PossibleFretting corrosion in the sense harness connector
- RareSolder joint cracking with temperature cycles
- 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 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.