Powertrain, generic · Hybrid propulsion

P0B3D Hybrid/EV Battery Voltage Sense A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B3D sets when cell voltage channel A reads below the lowest value a real cell can have, which points to the measurement rather than the cell. GM sets it in the battery energy control module when cell voltage A is 0.2 V or less for 1.4 s within a 2 s window, Type A, one trip, provided no open sense line, communication or balancing fault is active. FCA lists P0B3D as Hybrid Battery Voltage Sense A Circuit Low on the 2019 Ram 1500 with eTorque mild hybrid, next to the pack-level code P0ABA, and cures it with a battery pack control module update. A genuinely low cell is reported with separate cell voltage codes. Expect reduced or blocked hybrid assist.

Likely causes

Battery pack control module software, fixed by update (Ram eTorque)
Sense line shorted to the adjacent line or to the cell negative
Measurement input of the cell monitoring chip failed

Symptoms

  • MIL on
  • Start-stop and electric assist unavailable
  • Hybrid battery power limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–5,000
Time0.2–6 h

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

Parts involved

hv battery voltage sense awiring harnessbms

Related codes

P0B3BP0B3CP0B3EP0B42P0ABC

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