Powertrain, generic · Hybrid propulsion

P0B5E Hybrid/EV Battery Voltage Sense H Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B5E flags a broken measuring path on voltage sense H, the eighth cell tap channel read by the battery monitoring electronics. In GM's 2019 tables the battery energy control module runs an open sense line test within a 0.6 s window: neighbouring cells diverging by 1.3 V or more, a cell under 36 mV while its balancing switch is on, or a splice above 0.1 V (0.5 V at a bus bar splice) sets it as Type A. Ford names P0B5E in two bulletins: a no-start on the 2019-2020 Fusion plug-in hybrid, repaired with a new traction battery, and the 2023 Mustang Mach-E and E-Transit, where H is the last code of the affected range and an intermittent flexible printed circuit at the BECM is blamed. Starting and charging may fail.

Likely causes

Intermittent flexible printed circuit cable at the battery controller (Ford Mach-E, E-Transit 2023)
Open cell tap, splice or bus bar connection on channel H
Internal traction battery failure requiring pack replacement (Ford Fusion PHEV)

Symptoms

  • Powertrain malfunction (wrench) indicator and Stop Safely Now message
  • Vehicle does not start or does not become ready to drive
  • High-voltage battery cannot be charged

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 hwiring harnessbms

Related codes

P0B5FP0B60P0B61P0B62P0B59P0B63

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