P0B7CHybrid/EV Battery Voltage Sense N 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
- Voltage sense N, the fourteenth channel, reports a broken or high-resistance sense lead with P0B7C. It is the last code in Ford's TSB 23-2039: 2019-2020 Fusion plug-in hybrids that fail to start with any open-circuit code from P0B3B up to P0B7C get a replacement traction battery; the bulletin names no channel beyond N. In GM's 2019 battery controller tables N is the first channel whose open test runs 0.8 s within a 1.6 s window instead of 0.6 s, while the criteria (1.3 V adjacent-cell difference, 36 mV balancing gate, splice limits) stay the same, Type A. A second GM program of 2016 closes the balancing gates in a test pattern, turns the voltage drop into a sense-line resistance and fails above 30.00 in 7 of 9 samples, Type A.
- What you may notice
- No start or vehicle does not become ready
- MIL and stop-safely or service message
- Plug-in charging unavailable
- Likely causes
- LikelyInternal traction battery fault (Ford Fusion PHEV 2019-2020)
- PossibleSense lead N broken or with excessive resistance
- RareFault on 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: €150 – €7,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.