Powertrain, generic · Hybrid propulsion

P0B50 Hybrid/EV Battery Voltage Sense E Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

On the 2020 Chrysler Pacifica plug-in hybrid P0B50 is called Voltage Sense 5 Circuit Performance and rarely comes alone: the FCA bulletin lists it with the other sense channels, contactor stuck codes, a long precharge time and wake-up circuit faults, all cured by updating the battery pack control module. Some owners also notice that scheduled charging fails because the pack does not wake up. GM defines the check precisely: channel E must change in step with the average cell voltage, and a stuck reading in 35 of 40 samples sets the code, Type A; the 2012 two-mode hybrids instead flag block 5 when 20 times its value differs from the pack voltage by over 70 V. Open, low and high faults are separate codes.

Likely causes

Battery pack control module software, fixed by reflash (Chrysler Pacifica PHEV)
Channel E reading frozen in the measuring chip
Block voltage measurement drifting from pack voltage (GM two-mode)

Symptoms

  • MIL on
  • Scheduled charging does not start
  • Premature oil change or fuel refresh message (Pacifica)

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 ewiring harnessbms

Related codes

P0B4FP0B51P0B52P0B53P0B4BP0B55

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