Powertrain, generic · Hybrid propulsion

P0D5A Proximity Detection Circuit A Intermittent/Erratic

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D5A points to a proximity signal on circuit A that flips between states or jumps erratically, so the vehicle sees the plug come and go although nobody touched it. No manufacturer documents P0D5A publicly. The function itself is laid down in SAE J1772: the plug-present contact tells the car when a connector is seated and when its latch button is pressed, which lets it stop drawing current before disconnection. An unstable signal can therefore cause charging to abort without reason or a drive lock that appears and vanishes. Mercedes' smart bulletin for the 22 kW charger shows the typical background: loose low-voltage contacts that act up only when parts are warm or cold. Hard faults are P0D58 and P0D59.

Likely causes

Loose contact in the inlet or at the charger connector
Worn latch switch or contacts in the charging plug
Moisture in the charge inlet

Symptoms

  • Charging aborts sporadically
  • Plug status message appears and disappears
  • Occasional refusal to drive off

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

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

Parts involved

proximity detection acharge inlet awiring harness

Related codes

P0D56P0D57P0D58P0D59P2E8B

References: en.wikipedia.org, static.nhtsa.gov, law.cornell.edu.