Powertrain, generic · Hybrid propulsion

P0B54 Hybrid/EV Battery Voltage Sense F Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Ford's 2024 special service message for the 2023 Mustang Mach-E and E-Transit is the most instructive case for P0B54: vehicles built up to 9 December 2023 could store this and the other open-line codes from P0B3B to P0B5E, show the wrench light, refuse to start or charge, or display Stop Safely Now, and the cause was an intermittent BECM flexible printed circuit cable rather than the cells. The 2019-2020 Fusion PHEV shows the same code with a battery replacement as remedy. P0B54 itself means sense channel F is electrically open; GM confirms this with neighbouring cells at least 1.3 V apart, a balanced cell under 36 mV or a splice above 0.1 V for 0.6 s, Type A.

Likely causes

Intermittent BECM flexible printed circuit cable (Ford Mach-E, E-Transit built to Dec 2023)
Open channel F tap or splice
Internal traction battery failure (Ford Fusion PHEV)

Symptoms

  • Powertrain malfunction (wrench) indicator on
  • No start or no charging
  • Stop Safely Now message

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–8,000
Time0.5–8 h

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

Parts involved

hv battery voltage sense fwiring harnessbms

Related codes

P0B55P0B56P0B57P0B58P0B4FP0B59

References: static.nhtsa.gov, static.nhtsa.gov, gsi.ext.gm.com, law.cornell.edu.