Powertrain, generic (extended)

P2DD2 Control Pilot Charging Switch B Intermittent/Erratic

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2DD2 is stored when the signal of charging switch B changes state erratically: it drops out or toggles for brief moments, while lasting faults would end up as P2DCE, P2DD0 or P2DD1. Loose terminals, green corrosion at inlet pins or the module plug, and conductors that break contact only when the car moves or temperatures change are the usual suspects. On the pilot line each lost request counts: a J1772 station supplies power only while it sees roughly 6 V, the level that asks for current, so every dropout makes it switch off and possibly on again. No manufacturer documents P2DD2 publicly; under CARB rules a plug-in hybrid must notice a charger fault that breaks off charging. Switch A counterpart: P0CFC. Charging sessions stop and restart for no visible reason, and the battery may not be full in the morning.

Likely causes

Loose terminal in the charge inlet or module connector
Corrosion from water ingress at the charge inlet
Chafed wire losing contact with movement or temperature

Symptoms

  • Charging stops and restarts repeatedly
  • Battery not fully charged after a charging session

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–900
Time0.5–3 h

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

Parts involved

control pilot switch bwiring harnesson board charger

Related codes

P2DCEP2DD0P2DD1P2DCFP0CFC

References: en.wikipedia.org, law.cornell.edu.