Powertrain, generic (extended)

P2DB7 Battery Charging System B High Voltage Interlock Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2DB7 reports that the high voltage interlock loop of charging system B is broken. Such a loop is a low-current wire run in series through the HV plugs and covers of a charging path; once it opens, the control unit treats the path as unsafe and keeps it switched off. B denotes a second charging path, for example a further on-board charger. No manufacturer documents P2DB7 publicly. The A-side code P0D15 shows a typical cause: on 2021–2023 XC40 Recharge cars Volvo found that the plant had not closed the latches on the AC high-voltage plug linking inlet and charger (TJ 36522, P0D1513), and AC charging was lost; seating and latching the plug fixed it. CARB wants plug-in hybrids to detect faults that disable charging. Signal-level faults of this loop are P2DB8 to P2DBB.

Likely causes

HV connector in the charging path not fully seated or its catch not closed
Broken interlock wire or pushed-out terminal
Service cover or HV cover of the charger not closed properly
Fault in the interlock evaluation of the control module

Symptoms

  • No charging through charging path B
  • Charging system warning in the instrument cluster

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–4 h

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

Parts involved

bcs b hv interlockwiring harnesson board charger

Related codes

P2DB8P2DB9P2DBAP2DBBP0D15

References: static.nhtsa.gov, law.cornell.edu.