Powertrain, generic (extended)

P2D70 Battery Charging System Negative Contactor D Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2D70 groups electrical faults of negative charging contactor D, the return-side partner of plus contactor D (P2D69). What D switches and when P2D70 is set remain undocumented. Separate contactors in both poles of a charging path exist so that the inlet can be fully cut off; for diagnosis that means each pole must be tested alone. A Hyundai quick-charge patent does this once a session ends, with charge current already below about 5 A: it keeps one charge relay on, switches the other off and reads the inlet voltage, which must fall below the 60 V level that permits unlocking the connector. Under CARB, charging faults that stop the battery from charging must be detected. Specific faults: P2D71–P2D76.

Likely causes

Defective coil or contacts of minus contactor D
Wiring or connector fault on the contactor D circuit
Fault in the switching module

Symptoms

  • One charging mode unavailable
  • Charging connector may stay locked after a session
  • Driving unaffected

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–1,800
Time1–6 h

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

Parts involved

bcs neg contactor dwiring harnessbms

Related codes

P2D71P2D72P2D73P2D69P2D62P2BCBP0D0E

References: patents.google.com, law.cornell.edu.