Powertrain, generic · Hybrid propulsion

P0B7C Hybrid/EV Battery Voltage Sense N Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Internal traction battery fault (Ford Fusion PHEV 2019-2020)
Sense lead N broken or with excessive resistance
Fault on the cell monitoring board

Symptoms

  • No start or vehicle does not become ready
  • MIL and stop-safely or service message
  • Plug-in charging unavailable

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–7,000
Time1–10 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery voltage sense nwiring harnessbms

Related codes

P0B7DP0B7EP0B7FP0B80P0B77P0B81

References: static.nhtsa.gov, gsi.ext.gm.com, gsi.ext.gm.com.