Powertrain, generic · Hybrid propulsion

P0B55 Hybrid/EV Battery Voltage Sense F Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B55 is the plausibility code of cell channel F: the signal exists and lies inside its range, yet it does not move like the rest of the pack. On the 2016 Chevrolet Volt the vehicle integration control module checks whether channel F moves in the same direction as the average cell voltage, failing it after 7 seconds in an 8 second window, Type A; GM's 2019 tables use 35 failures in 40 samples of 100 ms. The 2012 two-mode hybrids compare block 6, times 20, with the pack voltage and allow 70 V. Chrysler labels it Voltage Sense 6 Circuit Performance on the 2020 Pacifica PHEV, the highest channel in that bulletin, and resolves it with BPCM software.

Likely causes

Battery controller software, fixed by update (Chrysler Pacifica PHEV)
Channel F measuring input stuck or slow to respond
Increased resistance in the channel F tap or connector

Symptoms

  • MIL with otherwise normal driving
  • Reduced hybrid or electric performance

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–6,000
Time0.2–8 h

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

Parts involved

hv battery voltage sense fwiring harnessbms

Related codes

P0B54P0B56P0B57P0B58P0B50P0B5A

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