P0B63Hybrid/EV Battery Voltage Sense I Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Channel I is the ninth sense input of the battery monitoring chain, and P0B63 reports that its circuit is open. GM shows how differently this can be detected. The BAS Plus mild hybrid (table 13OBDG05C) watches the voltage of line N and its neighbour N-1: if both drop under 1.4 V and change by more than 0.5 V within 200 ms, 7 of 10 samples set the code, Type B. The newer battery energy control module of the 2019 tables relies on neighbouring cells drifting 1.3 V apart, a balancing test below 36 mV or a splice voltage, all within 0.6 s, Type A. Ford lists P0B63 among the open-line codes behind a no-start on the 2019-2020 Fusion plug-in hybrid and replaces the traction battery.
- What you may notice
- Vehicle will not start or enter ready mode
- Service hybrid or EV system warning
- Electric mode unavailable
- Likely causes
- LikelyBroken channel I sense wire, crimp or cell tap
- PossibleInternal traction battery fault, pack replacement (Ford Fusion PHEV)
- RareCorroded or loose connector at the cell monitoring board
- 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 – €8,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.